vendor/ezyang/htmlpurifier/extras/FSTools.php

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<?php

/**
 * Filesystem tools not provided by default; can recursively create, copy
 * and delete folders. Some template methods are provided for extensibility.
 *
 * @note This class must be instantiated to be used, although it does
 *       not maintain state.
 */
class FSTools
{

    private static $singleton;

    /**
     * Returns a global instance of FSTools
     */
    public static function singleton()
    {
        if (empty(FSTools::$singleton)) FSTools::$singleton = new FSTools();
        return FSTools::$singleton;
    }

    /**
     * Sets our global singleton to something else; useful for overloading
     * functions.
     */
    public static function setSingleton($singleton)
    {
        FSTools::$singleton = $singleton;
    }

    /**
     * Recursively creates a directory
     * @param string $folder Name of folder to create
     * @note Adapted from the PHP manual comment 76612
     */
    public function mkdirr($folder)
    {
        $folders = preg_split("#[\\\\/]#", $folder);
        $base = '';
        for($i = 0, $c = count($folders); $i < $c; $i++) {
            if(empty($folders[$i])) {
                if (!$i) {
                    // special case for root level
                    $base .= DIRECTORY_SEPARATOR;
                }
                continue;
            }
            $base .= $folders[$i];
            if(!is_dir($base)){
                $this->mkdir($base);
            }
            $base .= DIRECTORY_SEPARATOR;
        }
    }

    /**
     * Copy a file, or recursively copy a folder and its contents; modified
     * so that copied files, if PHP, have includes removed