# Class yii\helpers\BaseFileHelper

Inheritance | yii\helpers\BaseFileHelper
Subclasses | yii\helpers\FileHelper
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/helpers/BaseFileHelper.php

BaseFileHelper provides concrete implementation for yii\helpers\FileHelper.

Do not use BaseFileHelper. Use yii\helpers\FileHelper instead.

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$mimeAliasesFile | string | The path (or alias) of a PHP file containing MIME aliases. | yii\helpers\BaseFileHelper
$mimeExtensionsFile | string | The path (or alias) of a PHP file containing extensions per MIME type. | yii\helpers\BaseFileHelper
$mimeMagicFile | string | The path (or alias) of a PHP file containing MIME type information. | yii\helpers\BaseFileHelper

## Public Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
changeOwnership() | Changes the Unix user and/or group ownership of a file or directory, and optionally the mode. | yii\helpers\BaseFileHelper
copyDirectory() | Copies a whole directory as another one. | yii\helpers\BaseFileHelper
createDirectory() | Creates a new directory. | yii\helpers\BaseFileHelper
filterPath() | Checks if the given file path satisfies the filtering options. | yii\helpers\BaseFileHelper
findDirectories() | Returns the directories found under the specified directory and subdirectories. | yii\helpers\BaseFileHelper
findFiles() | Returns the files found under the specified directory and subdirectories. | yii\helpers\BaseFileHelper
getExtensionByMimeType() | Determines the most common extension by given MIME type. | yii\helpers\BaseFileHelper
getExtensionsByMimeType() | Determines the extensions by given MIME type. | yii\helpers\BaseFileHelper
getMimeType() | Determines the MIME type of the specified file. | yii\helpers\BaseFileHelper
getMimeTypeByExtension() | Determines the MIME type based on the extension name of the specified file. | yii\helpers\BaseFileHelper
localize() | Returns the localized version of a specified file. | yii\helpers\BaseFileHelper
normalizePath() | Normalizes a file/directory path. | yii\helpers\BaseFileHelper
removeDirectory() | Removes a directory (and all its content) recursively. | yii\helpers\BaseFileHelper
unlink() | Removes a file or symlink in a cross-platform way | yii\helpers\BaseFileHelper

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
loadMimeAliases() | Loads MIME aliases from the specified file. | yii\helpers\BaseFileHelper
loadMimeExtensions() | Loads MIME extensions from the specified file. | yii\helpers\BaseFileHelper
loadMimeTypes() | Loads MIME types from the specified file. | yii\helpers\BaseFileHelper
normalizeOptions() |  | yii\helpers\BaseFileHelper

## Constants

Hide inherited constants

Constant | Value | Description | Defined By
--- | --- | --- | ---
PATTERN_CASE_INSENSITIVE | 32 |  | yii\helpers\BaseFileHelper
PATTERN_ENDSWITH | 4 |  | yii\helpers\BaseFileHelper
PATTERN_MUSTBEDIR | 8 |  | yii\helpers\BaseFileHelper
PATTERN_NEGATIVE | 16 |  | yii\helpers\BaseFileHelper
PATTERN_NODIR | 1 |  | yii\helpers\BaseFileHelper

## Property Details

Hide inherited properties

$mimeAliasesFile public static property (available since version 2.0.14)

The path (or alias) of a PHP file containing MIME aliases.

public static string $mimeAliasesFile = '@yii/helpers/mimeAliases.php'
$mimeExtensionsFile public static property (available since version 2.0.48)

The path (or alias) of a PHP file containing extensions per MIME type.

public static string $mimeExtensionsFile = '@yii/helpers/mimeExtensions.php'
$mimeMagicFile public static property

The path (or alias) of a PHP file containing MIME type information.

public static string $mimeMagicFile = '@yii/helpers/mimeTypes.php'

## Method Details

Hide inherited methods

changeOwnership() public static method (available since version 2.0.43)

Changes the Unix user and/or group ownership of a file or directory, and optionally the mode.

Note: This function will not work on remote files as the file to be examined must be accessible via the server's filesystem. Note: On Windows, this function fails silently when applied on a regular file.

public static void changeOwnership ( $path, $ownership, $mode = null )
$path | string | The path to the file or directory.

$ownership

string|array|integer|null

The user and/or group ownership for the file or directory. When $ownership is a string, the format is 'user:group' where both are optional. E.g. 'user' or 'user:' will only change the user, ':group' will only change the group, 'user:group' will change both. When $owners is an index array the format is [0 => user, 1 => group], e.g. `[$myUser, $myGroup]`. It is also possible to pass an associative array, e.g. ['user' => $myUser, 'group' => $myGroup]. In case $owners is an integer it will be used as user id. If `null`, an empty array or an empty string is passed, the ownership will not be changed.

$mode | integer|null | The permission to be set for the file or directory. If `null` is passed, the mode will not be changed.

Source code

                    public static function changeOwnership($path, $ownership, $mode = null)
    {
        if (!file_exists((string)$path)) {
            throw new InvalidArgumentException('Unable to change ownership, "' . $path . '" is not a file or directory.');
        }
        if (empty($ownership) && $ownership !== 0 && $mode === null) {
            return;
        }
        $user = $group = null;
        if (!empty($ownership) || $ownership === 0 || $ownership === '0') {
            if (is_int($ownership)) {
                $user = $ownership;
            } elseif (is_string($ownership)) {
                $ownerParts = explode(':', $ownership);
                $user = $ownerParts[0];
                if (count($ownerParts) > 1) {
                    $group = $ownerParts[1];
                }
            } elseif (is_array($ownership)) {
                $ownershipIsIndexed = ArrayHelper::isIndexed($ownership);
                $user = ArrayHelper::getValue($ownership, $ownershipIsIndexed ? 0 : 'user');
                $group = ArrayHelper::getValue($ownership, $ownershipIsIndexed ? 1 : 'group');
            } else {
                throw new InvalidArgumentException('$ownership must be an integer, string, array, or null.');
            }
        }
        if ($mode !== null) {
            if (!is_int($mode)) {
                throw new InvalidArgumentException('$mode must be an integer or null.');
            }
            if (!chmod($path, $mode)) {
                throw new Exception('Unable to change mode of "' . $path . '" to "0' . decoct($mode) . '".');
            }
        }
        if ($user !== null && $user !== '') {
            if (is_numeric($user)) {
                $user = (int) $user;
            } elseif (!is_string($user)) {
                throw new InvalidArgumentException('The user part of $ownership must be an integer, string, or null.');
            }
            if (!chown($path, $user)) {
                throw new Exception('Unable to change user ownership of "' . $path . '" to "' . $user . '".');
            }
        }
        if ($group !== null && $group !== '') {
            if (is_numeric($group)) {
                $group = (int) $group;
            } elseif (!is_string($group)) {
                throw new InvalidArgumentException('The group part of $ownership must be an integer, string or null.');
            }
            if (!chgrp($path, $group)) {
                throw new Exception('Unable to change group ownership of "' . $path . '" to "' . $group . '".');
            }
        }
    }

copyDirectory() public static method

Copies a whole directory as another one.

The files and sub-directories will also be copied over.

public static void copyDirectory ( $src, $dst, $options = [] )
$src | string | The source directory
$dst | string | The destination directory

$options

array

Options for directory copy. Valid options are:

- dirMode: integer, the permission to be set for newly copied directories. Defaults to 0775.
- fileMode: integer, the permission to be set for newly copied files. Defaults to the current environment setting.

- filter: callback, a PHP callback that is called for each directory or file. The signature of the callback should be: `function ($path)`, where `$path` refers the full path to be filtered. The callback can return one of the following values:

  - true: the directory or file will be copied (the "only" and "except" options will be ignored)
  - false: the directory or file will NOT be copied (the "only" and "except" options will be ignored)
  - null: the "only" and "except" options will determine whether the directory or file should be copied
- only: array, list of patterns that the file paths should match if they want to be copied. A path matches a pattern if it contains the pattern string at its end. For example, '.php' matches all file paths ending with '.php'. Note, the '/' characters in a pattern matches both '/' and '\' in the paths. If a file path matches a pattern in both "only" and "except", it will NOT be copied.
- except: array, list of patterns that the files or directories should match if they want to be excluded from being copied. A path matches a pattern if it contains the pattern string at its end. Patterns ending with '/' apply to directory paths only, and patterns not ending with '/' apply to file paths only. For example, '/a/b' matches all file paths ending with '/a/b'; and '.svn/' matches directory paths ending with '.svn'. Note, the '/' characters in a pattern matches both '/' and '\' in the paths.
- caseSensitive: boolean, whether patterns specified at "only" or "except" should be case sensitive. Defaults to true.
- recursive: boolean, whether the files under the subdirectories should also be copied. Defaults to true.
- beforeCopy: callback, a PHP callback that is called before copying each sub-directory or file. If the callback returns false, the copy operation for the sub-directory or file will be cancelled. The signature of the callback should be: `function ($from, $to)`, where `$from` is the sub-directory or file to be copied from, while `$to` is the copy target.
- afterCopy: callback, a PHP callback that is called after each sub-directory or file is successfully copied. The signature of the callback should be: `function ($from, $to)`, where `$from` is the sub-directory or file copied from, while `$to` is the copy target.
- copyEmptyDirectories: boolean, whether to copy empty directories. Set this to false to avoid creating directories that do not contain files. This affects directories that do not contain files initially as well as directories that do not contain files at the target destination because files have been filtered via `only` or `except`. Defaults to true. This option is available since version 2.0.12. Before 2.0.12 empty directories are always copied.

throws | yii\base\InvalidArgumentException | if unable to open directory

Source code

                    public static function copyDirectory($src, $dst, $options = [])
    {
        $src = static::normalizePath($src);
        $dst = static::normalizePath($dst);
        if ($src === $dst || strpos($dst, $src . DIRECTORY_SEPARATOR) === 0) {
            throw new InvalidArgumentException('Trying to copy a directory to itself or a subdirectory.');
        }
        $dstExists = is_dir($dst);
        if (!$dstExists && (!isset($options['copyEmptyDirectories']) || $options['copyEmptyDirectories'])) {
            static::createDirectory($dst, isset($options['dirMode']) ? $options['dirMode'] : 0775, true);
            $dstExists = true;
        }
        $handle = opendir($src);
        if ($handle === false) {
            throw new InvalidArgumentException("Unable to open directory: $src");
        }
        if (!isset($options['basePath'])) {
            // this should be done only once
            $options['basePath'] = realpath($src);
            $options = static::normalizeOptions($options);
        }
        while (($file = readdir($handle)) !== false) {
            if ($file === '.' || $file === '..') {
                continue;
            }
            $from = $src . DIRECTORY_SEPARATOR . $file;
            $to = $dst . DIRECTORY_SEPARATOR . $file;
            if (static::filterPath($from, $options)) {
                if (isset($options['beforeCopy']) && !call_user_func($options['beforeCopy'], $from, $to)) {
                    continue;
                }
                if (is_file($from)) {
                    if (!$dstExists) {
                        // delay creation of destination directory until the first file is copied to avoid creating empty directories
                        static::createDirectory($dst, isset($options['dirMode']) ? $options['dirMode'] : 0775, true);
                        $dstExists = true;
                    }
                    copy($from, $to);
                    if (isset($options['fileMode'])) {
                        @chmod($to, $options['fileMode']);
                    }
                } else {
                    // recursive copy, defaults to true
                    if (!isset($options['recursive']) || $options['recursive']) {
                        static::copyDirectory($from, $to, $options);
                    }
                }
                if (isset($options['afterCopy'])) {
                    call_user_func($options['afterCopy'], $from, $to);
                }
            }
        }
        closedir($handle);
    }

createDirectory() public static method

Creates a new directory.

This method is similar to the PHP `mkdir()` function except that it uses `chmod()` to set the permission of the created directory in order to avoid the impact of the `umask` setting.

public static boolean createDirectory ( $path, $mode = 0775, $recursive = true )
$path | string | Path of the directory to be created.
$mode | integer | The permission to be set for the created directory.
$recursive | boolean | Whether to create parent directories if they do not exist.
return | boolean | Whether the directory is created successfully
throws | yii\base\Exception | if the directory could not be created (i.e. php error due to parallel changes)

Source code

                    public static function createDirectory($path, $mode = 0775, $recursive = true)
    {
        if (is_dir($path)) {
            return true;
        }
        $parentDir = dirname($path);
        // recurse if parent dir does not exist and we are not at the root of the file system.
        if ($recursive && !is_dir($parentDir) && $parentDir !== $path) {
            static::createDirectory($parentDir, $mode, true);
        }
        try {
            if (!mkdir($path, $mode)) {
                return false;
            }
        } catch (\Exception $e) {
            if (!is_dir($path)) {// https://github.com/yiisoft/yii2/issues/9288
                throw new \yii\base\Exception("Failed to create directory \"$path\": " . $e->getMessage(), $e->getCode(), $e);
            }
        }
        try {
            return chmod($path, $mode);
        } catch (\Exception $e) {
            throw new \yii\base\Exception("Failed to change permissions for directory \"$path\": " . $e->getMessage(), $e->getCode(), $e);
        }
    }

filterPath() public static method

Checks if the given file path satisfies the filtering options.

public static boolean filterPath ( $path, $options )
$path | string | The path of the file or directory to be checked
$options | array | The filtering options. See findFiles() for explanations of the supported options.
return | boolean | Whether the file or directory satisfies the filtering options.

Source code

                    public static function filterPath($path, $options)
    {
        if (isset($options['filter'])) {
            $result = call_user_func($options['filter'], $path);
            if (is_bool($result)) {
                return $result;
            }
        }
        if (empty($options['except']) && empty($options['only'])) {
            return true;
        }
        $path = str_replace('\\', '/', $path);
        if (
            !empty($options['except'])
            && ($except = self::lastExcludeMatchingFromList($options['basePath'], $path, $options['except'])) !== null
        ) {
            return $except['flags'] & self::PATTERN_NEGATIVE;
        }
        if (!empty($options['only']) && !is_dir($path)) {
            return self::lastExcludeMatchingFromList($options['basePath'], $path, $options['only']) !== null;
        }
        return true;
    }

findDirectories() public static method (available since version 2.0.14)

Returns the directories found under the specified directory and subdirectories.

public static array findDirectories ( $dir, $options = [] )
$dir | string | The directory under which the files will be looked for.

$options

array

Options for directory searching. Valid options are:

- `filter`: callback, a PHP callback that is called for each directory or file. The signature of the callback should be: `function (string $path): bool`, where `$path` refers the full path to be filtered. The callback can return one of the following values:

  - `true`: the directory will be returned
  - `false`: the directory will NOT be returned

- `recursive`: boolean, whether the files under the subdirectories should also be looked for. Defaults to `true`. See findFiles() for more options.

return | array | Directories found under the directory, in no particular order. Ordering depends on the files system used.
throws | yii\base\InvalidArgumentException | if the dir is invalid.

Source code

                    public static function findDirectories($dir, $options = [])
    {
        $dir = self::clearDir($dir);
        $options = self::setBasePath($dir, $options);
        $list = [];
        $handle = self::openDir($dir);
        while (($file = readdir($handle)) !== false) {
            if ($file === '.' || $file === '..') {
                continue;
            }
            $path = $dir . DIRECTORY_SEPARATOR . $file;
            if (is_dir($path) && static::filterPath($path, $options)) {
                $list[] = $path;
                if (!isset($options['recursive']) || $options['recursive']) {
                    $list = array_merge($list, static::findDirectories($path, $options));
                }
            }
        }
        closedir($handle);
        return $list;
    }

findFiles() public static method

Returns the files found under the specified directory and subdirectories.

public static array findFiles ( $dir, $options = [] )
$dir | string | The directory under which the files will be looked for.

$options

array

Options for file searching. Valid options are:

- `filter`: callback, a PHP callback that is called for each directory or file. The signature of the callback should be: `function ($path)`, where `$path` refers the full path to be filtered. The callback can return one of the following values:

  - `true`: the directory or file will be returned (the `only` and `except` options will be ignored)
  - `false`: the directory or file will NOT be returned (the `only` and `except` options will be ignored)
  - `null`: the `only` and `except` options will determine whether the directory or file should be returned
- `except`: array, list of patterns excluding from the results matching file or directory paths. Patterns ending with slash ('/') apply to directory paths only, and patterns not ending with '/' apply to file paths only. For example, '/a/b' matches all file paths ending with '/a/b'; and `.svn/` matches directory paths ending with `.svn`. If the pattern does not contain a slash (`/`), it is treated as a shell glob pattern and checked for a match against the pathname relative to `$dir`. Otherwise, the pattern is treated as a shell glob suitable for consumption by `fnmatch(3)` with the `FNM_PATHNAME` flag: wildcards in the pattern will not match a `/` in the pathname. For example, `views/*.php` matches `views/index.php` but not `views/controller/index.php`. A leading slash matches the beginning of the pathname. For example, `/*.php` matches `index.php` but not `views/start/index.php`. An optional prefix `!` which negates the pattern; any matching file excluded by a previous pattern will become included again. If a negated pattern matches, this will override lower precedence patterns sources. Put a backslash (`\`) in front of the first `!` for patterns that begin with a literal `!`, for example, `\!important!.txt`. Note, the '/' characters in a pattern matches both '/' and '\' in the paths. You can find more details about the gitignore pattern format here.
- `only`: array, list of patterns that the file paths should match if they are to be returned. Directory paths are not checked against them. Same pattern matching rules as in the `except` option are used. If a file path matches a pattern in both `only` and `except`, it will NOT be returned.
- `caseSensitive`: boolean, whether patterns specified at `only` or `except` should be case sensitive. Defaults to `true`.
- `recursive`: boolean, whether the files under the subdirectories should also be looked for. Defaults to `true`.

return | array | Files found under the directory, in no particular order. Ordering depends on the files system used.
throws | yii\base\InvalidArgumentException | if the dir is invalid.

Source code

                    public static function findFiles($dir, $options = [])
    {
        $dir = self::clearDir($dir);
        $options = self::setBasePath($dir, $options);
        $list = [];
        $handle = self::openDir($dir);
        while (($file = readdir($handle)) !== false) {
            if ($file === '.' || $file === '..') {
                continue;
            }
            $path = $dir . DIRECTORY_SEPARATOR . $file;
            if (static::filterPath($path, $options)) {
                if (is_file($path)) {
                    $list[] = $path;
                } elseif (is_dir($path) && (!isset($options['recursive']) || $options['recursive'])) {
                    $list = array_merge($list, static::findFiles($path, $options));
                }
            }
        }
        closedir($handle);
        return $list;
    }

getExtensionByMimeType() public static method (available since version 2.0.48)

Determines the most common extension by given MIME type.

This method will use a local map between MIME types and extension names.

public static string|null getExtensionByMimeType ( $mimeType, $preferShort = false, $magicFile = null )
$mimeType | string | File MIME type.
$preferShort | boolean | Return an extension with a maximum of 3 characters.
$magicFile | string|null | The path (or alias) of the file that contains all available MIME type information. If this is not set, the file specified by $mimeMagicFile will be used.
return | string|null | The extensions corresponding to the specified MIME type

Source code

                    public static function getExtensionByMimeType($mimeType, $preferShort = false, $magicFile = null)
    {
        $aliases = static::loadMimeAliases(static::$mimeAliasesFile);
        if (isset($aliases[$mimeType])) {
            $mimeType = $aliases[$mimeType];
        }
        $mimeExtensions = static::loadMimeExtensions($magicFile);
        if (!array_key_exists($mimeType, $mimeExtensions)) {
            return null;
        }
        $extensions = $mimeExtensions[$mimeType];
        if (is_array($extensions)) {
            if ($preferShort) {
                foreach ($extensions as $extension) {
                    if (mb_strlen($extension, 'UTF-8') <= 3) {
                        return $extension;
                    }
                }
            }
            return $extensions[0];
        } else {
            return $extensions;
        }
    }

getExtensionsByMimeType() public static method

Determines the extensions by given MIME type.

This method will use a local map between extension names and MIME types.

public static array getExtensionsByMimeType ( $mimeType, $magicFile = null )
$mimeType | string | File MIME type.
$magicFile | string|null | The path (or alias) of the file that contains all available MIME type information. If this is not set, the file specified by $mimeMagicFile will be used.
return | array | The extensions corresponding to the specified MIME type

Source code

                    public static function getExtensionsByMimeType($mimeType, $magicFile = null)
    {
        $aliases = static::loadMimeAliases(static::$mimeAliasesFile);
        if (isset($aliases[$mimeType])) {
            $mimeType = $aliases[$mimeType];
        }
        // Note: For backwards compatibility the "MimeTypes" file is used.
        $mimeTypes = static::loadMimeTypes($magicFile);
        return array_keys($mimeTypes, mb_strtolower($mimeType, 'UTF-8'), true);
    }

getMimeType() public static method

Determines the MIME type of the specified file.

This method will first try to determine the MIME type based on finfo_open. If the `fileinfo` extension is not installed, it will fall back to getMimeTypeByExtension() when `$checkExtension` is true.

public static string|null getMimeType ( $file, $magicFile = null, $checkExtension = true )
$file | string | The file name.
$magicFile | string|null | Name of the optional magic database file (or alias), usually something like `/path/to/magic.mime`. This will be passed as the second parameter to finfo_open() when the `fileinfo` extension is installed. If the MIME type is being determined based via getMimeTypeByExtension() and this is null, it will use the file specified by $mimeMagicFile.
$checkExtension | boolean | Whether to use the file extension to determine the MIME type in case `finfo_open()` cannot determine it.
return | string|null | The MIME type (e.g. `text/plain`). Null is returned if the MIME type cannot be determined.
throws | yii\base\InvalidConfigException | when the `fileinfo` PHP extension is not installed and `$checkExtension` is `false`.

Source code

                    public static function getMimeType($file, $magicFile = null, $checkExtension = true)
    {
        if ($magicFile !== null) {
            $magicFile = Yii::getAlias($magicFile);
        }
        if (!extension_loaded('fileinfo')) {
            if ($checkExtension) {
                return static::getMimeTypeByExtension($file, $magicFile);
            }
            throw new InvalidConfigException('The fileinfo PHP extension is not installed.');
        }
        $info = finfo_open(FILEINFO_MIME_TYPE, $magicFile);
        if ($info) {
            $result = finfo_file($info, $file);
            finfo_close($info);
            if ($result !== false) {
                return $result;
            }
        }
        return $checkExtension ? static::getMimeTypeByExtension($file, $magicFile) : null;
    }

getMimeTypeByExtension() public static method

Determines the MIME type based on the extension name of the specified file.

This method will use a local map between extension names and MIME types.

public static string|null getMimeTypeByExtension ( $file, $magicFile = null )
$file | string | The file name.
$magicFile | string|null | The path (or alias) of the file that contains all available MIME type information. If this is not set, the file specified by $mimeMagicFile will be used.
return | string|null | The MIME type. Null is returned if the MIME type cannot be determined.

Source code

                    public static function getMimeTypeByExtension($file, $magicFile = null)
    {
        $mimeTypes = static::loadMimeTypes($magicFile);
        if (($ext = pathinfo($file, PATHINFO_EXTENSION)) !== '') {
            $ext = strtolower($ext);
            if (isset($mimeTypes[$ext])) {
                return $mimeTypes[$ext];
            }
        }
        return null;
    }

loadMimeAliases() protected static method (available since version 2.0.14)

Loads MIME aliases from the specified file.

protected static array loadMimeAliases ( $aliasesFile )
$aliasesFile | string|null | The path (or alias) of the file that contains MIME type aliases. If this is not set, the file specified by $mimeAliasesFile will be used.
return | array | The mapping from file extensions to MIME types

Source code

                    protected static function loadMimeAliases($aliasesFile)
    {
        if ($aliasesFile === null) {
            $aliasesFile = static::$mimeAliasesFile;
        }
        $aliasesFile = Yii::getAlias($aliasesFile);
        if (!isset(self::$_mimeAliases[$aliasesFile])) {
            self::$_mimeAliases[$aliasesFile] = require $aliasesFile;
        }
        return self::$_mimeAliases[$aliasesFile];
    }

loadMimeExtensions() protected static method (available since version 2.0.48)

Loads MIME extensions from the specified file.

protected static array loadMimeExtensions ( $extensionsFile )
$extensionsFile | string|null | The path (or alias) of the file that contains MIME type aliases. If this is not set, the file specified by $mimeAliasesFile will be used.
return | array | The mapping from file extensions to MIME types

Source code

                    protected static function loadMimeExtensions($extensionsFile)
    {
        if ($extensionsFile === null) {
            $extensionsFile = static::$mimeExtensionsFile;
        }
        $extensionsFile = Yii::getAlias($extensionsFile);
        if (!isset(self::$_mimeExtensions[$extensionsFile])) {
            self::$_mimeExtensions[$extensionsFile] = require $extensionsFile;
        }
        return self::$_mimeExtensions[$extensionsFile];
    }

loadMimeTypes() protected static method

Loads MIME types from the specified file.

protected static array loadMimeTypes ( $magicFile )
$magicFile | string|null | The path (or alias) of the file that contains all available MIME type information. If this is not set, the file specified by $mimeMagicFile will be used.
return | array | The mapping from file extensions to MIME types

Source code

                    protected static function loadMimeTypes($magicFile)
    {
        if ($magicFile === null) {
            $magicFile = static::$mimeMagicFile;
        }
        $magicFile = Yii::getAlias($magicFile);
        if (!isset(self::$_mimeTypes[$magicFile])) {
            self::$_mimeTypes[$magicFile] = require $magicFile;
        }
        return self::$_mimeTypes[$magicFile];
    }

localize() public static method

Returns the localized version of a specified file.

The searching is based on the specified language code. In particular, a file with the same name will be looked for under the subdirectory whose name is the same as the language code. For example, given the file "path/to/view.php" and language code "zh-CN", the localized file will be looked for as "path/to/zh-CN/view.php". If the file is not found, it will try a fallback with just a language code that is "zh" i.e. "path/to/zh/view.php". If it is not found as well the original file will be returned.

If the target and the source language codes are the same, the original file will be returned.

public static string localize ( $file, $language = null, $sourceLanguage = null )
$file | string | The original file
$language | string|null | The target language that the file should be localized to. If not set, the value of yii\base\Application::$language will be used.
$sourceLanguage | string|null | The language that the original file is in. If not set, the value of yii\base\Application::$sourceLanguage will be used.
return | string | The matching localized file, or the original file if the localized version is not found. If the target and the source language codes are the same, the original file will be returned.

Source code

                    public static function localize($file, $language = null, $sourceLanguage = null)
    {
        if ($language === null) {
            $language = Yii::$app->language;
        }
        if ($sourceLanguage === null) {
            $sourceLanguage = Yii::$app->sourceLanguage;
        }
        if ($language === $sourceLanguage) {
            return $file;
        }
        $desiredFile = dirname($file) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($file);
        if (is_file($desiredFile)) {
            return $desiredFile;
        }
        $language = substr($language, 0, 2);
        if ($language === $sourceLanguage) {
            return $file;
        }
        $desiredFile = dirname($file) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($file);
        return is_file($desiredFile) ? $desiredFile : $file;
    }

normalizeOptions() protected static method (available since version 2.0.12)

protected static array normalizeOptions ( array $options )
$options | array | Raw options
return | array | Normalized options

Source code

                    protected static function normalizeOptions(array $options)
    {
        if (!array_key_exists('caseSensitive', $options)) {
            $options['caseSensitive'] = true;
        }
        if (isset($options['except'])) {
            foreach ($options['except'] as $key => $value) {
                if (is_string($value)) {
                    $options['except'][$key] = self::parseExcludePattern($value, $options['caseSensitive']);
                }
            }
        }
        if (isset($options['only'])) {
            foreach ($options['only'] as $key => $value) {
                if (is_string($value)) {
                    $options['only'][$key] = self::parseExcludePattern($value, $options['caseSensitive']);
                }
            }
        }
        return $options;
    }

normalizePath() public static method

Normalizes a file/directory path.

The normalization does the following work:

- Convert all directory separators into `DIRECTORY_SEPARATOR` (e.g. "\a/b\c" becomes "/a/b/c")
- Remove trailing directory separators (e.g. "/a/b/c/" becomes "/a/b/c")
- Turn multiple consecutive slashes into a single one (e.g. "/a///b/c" becomes "/a/b/c")
- Remove ".." and "." based on their meanings (e.g. "/a/./b/../c" becomes "/a/c")

Note: For registered stream wrappers, the consecutive slashes rule and ".."/"." translations are skipped.

public static string normalizePath ( $path, $ds = DIRECTORY_SEPARATOR )
$path | string | The file/directory path to be normalized
$ds | string | The directory separator to be used in the normalized result. Defaults to `DIRECTORY_SEPARATOR`.
return | string | The normalized file/directory path

Source code

                    public static function normalizePath($path, $ds = DIRECTORY_SEPARATOR)
    {
        $path = rtrim(strtr($path, '/\\', $ds . $ds), $ds);
        if (strpos($ds . $path, "{$ds}.") === false && strpos($path, "{$ds}{$ds}") === false) {
            return $path;
        }
        // fix #17235 stream wrappers
        foreach (stream_get_wrappers() as $protocol) {
            if (strpos($path, "{$protocol}://") === 0) {
                return $path;
            }
        }
        // the path may contain ".", ".." or double slashes, need to clean them up
        if (strpos($path, "{$ds}{$ds}") === 0 && $ds == '\\') {
            $parts = [$ds];
        } else {
            $parts = [];
        }
        foreach (explode($ds, $path) as $part) {
            if ($part === '..' && !empty($parts) && end($parts) !== '..') {
                array_pop($parts);
            } elseif ($part === '.' || $part === '' && !empty($parts)) {
                continue;
            } else {
                $parts[] = $part;
            }
        }
        $path = implode($ds, $parts);
        return $path === '' ? '.' : $path;
    }

removeDirectory() public static method

Removes a directory (and all its content) recursively.

public static void removeDirectory ( $dir, $options = [] )
$dir | string | The directory to be deleted recursively.

$options

array

Options for directory remove. Valid options are:

- traverseSymlinks: boolean, whether symlinks to the directories should be traversed too. Defaults to `false`, meaning the content of the symlinked directory would not be deleted. Only symlink would be removed in that default case.

throws | yii\base\ErrorException | in case of failure

Source code

                    public static function removeDirectory($dir, $options = [])
    {
        if (!is_dir($dir)) {
            return;
        }
        if (!empty($options['traverseSymlinks']) || !is_link($dir)) {
            if (!($handle = opendir($dir))) {
                return;
            }
            while (($file = readdir($handle)) !== false) {
                if ($file === '.' || $file === '..') {
                    continue;
                }
                $path = $dir . DIRECTORY_SEPARATOR . $file;
                if (is_dir($path)) {
                    static::removeDirectory($path, $options);
                } else {
                    static::unlink($path);
                }
            }
            closedir($handle);
        }
        if (is_link($dir)) {
            static::unlink($dir);
        } else {
            rmdir($dir);
        }
    }

unlink() public static method (available since version 2.0.14)

Removes a file or symlink in a cross-platform way

public static boolean unlink ( $path )
$path | string |

Source code

                    public static function unlink($path)
    {
        $isWindows = DIRECTORY_SEPARATOR === '\\';
        if (!$isWindows) {
            return unlink($path);
        }
        if (is_link($path) && is_dir($path)) {
            return rmdir($path);
        }
        try {
            return unlink($path);
        } catch (ErrorException $e) {
            // last resort measure for Windows
            if (is_dir($path) && count(static::findFiles($path)) !== 0) {
                return false;
            }
            if (function_exists('exec') && file_exists($path)) {
                exec('DEL /F/Q ' . escapeshellarg($path));
                return !file_exists($path);
            }
            return false;
        }
    }