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EDIT :: System.php

<?php
/**
 * File/Directory manipulation
 *
 * PHP versions 4 and 5
 *
 * @category   pear
 * @package    System
 * @author     Tomas V.V.Cox <cox@idecnet.com>
 * @copyright  1997-2009 The Authors
 * @license    http://opensource.org/licenses/bsd-license.php New BSD License
 * @link       http://pear.php.net/package/PEAR
 * @since      File available since Release 0.1
 */

/**
 * base class
 */
require_once 'PEAR.php';
require_once 'Console/Getopt.php';

$GLOBALS['_System_temp_files'] = array();

/**
* System offers cross platform compatible system functions
*
* Static functions for different operations. Should work under
* Unix and Windows. The names and usage has been taken from its respectively
* GNU commands. The functions will return (bool) false on error and will
* trigger the error with the PHP trigger_error() function (you can silence
* the error by prefixing a '@' sign after the function call, but this
* is not recommended practice.  Instead use an error handler with
* {@link set_error_handler()}).
*
* Documentation on this class you can find in:
* http://pear.php.net/manual/
*
* Example usage:
* if (!@System::rm('-r file1 dir1')) {
*    print "could not delete file1 or dir1";
* }
*
* In case you need to to pass file names with spaces,
* pass the params as an array:
*
* System::rm(array('-r', $file1, $dir1));
*
* @category   pear
* @package    System
* @author     Tomas V.V. Cox <cox@idecnet.com>
* @copyright  1997-2006 The PHP Group
* @license    http://opensource.org/licenses/bsd-license.php New BSD License
* @version    Release: 1.10.16
* @link       http://pear.php.net/package/PEAR
* @since      Class available since Release 0.1
* @static
*/
class System
{
    /**
     * returns the commandline arguments of a function
     *
     * @param    string  $argv           the commandline
     * @param    string  $short_options  the allowed option short-tags
     * @param    string  $long_options   the allowed option long-tags
     * @return   array   the given options and there values
     */
    public static function _parseArgs($argv, $short_options, $long_options = null)
    {
        if (!is_array($argv) && $argv !== null) {
            /*
            // Quote all items that are a short option
            $av = preg_split('/(\A| )--?[a-z0-9]+[ =]?((?<!\\\\)((,\s*)|((?<!,)\s+))?)/i', $argv, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_OFFSET_CAPTURE);
            $offset = 0;
            foreach ($av as $a) {
                $b = trim($a[0]);
                if ($b[0] == '"' || $b[0] == "'") {
                    continue;
                }

$escape = escapeshellarg($b);
                $pos = $a[1] + $offset;
                $argv = substr_replace($argv, $escape, $pos, strlen($b));
                $offset += 2;
            }
            */

// Find all items, quoted or otherwise
            preg_match_all("/(?:[\"'])(.*?)(?:['\"])|([^\s]+)/", $argv, $av);
            $argv = $av[1];
            foreach ($av[2] as $k => $a) {
                if (empty($a)) {
                    continue;
                }
                $argv[$k] = trim($a) ;
            }
        }

return Console_Getopt::getopt2($argv, $short_options, $long_options);
    }

/**
     * Output errors with PHP trigger_error(). You can silence the errors
     * with prefixing a "@" sign to the function call: @System::mkdir(..);
     *
     * @param mixed $error a PEAR error or a string with the error message
     * @return bool false
     */
    protected static function raiseError($error)
    {
        if (PEAR::isError($error)) {
            $error = $error->getMessage();
        }
        trigger_error($error, E_USER_WARNING);
        return false;
    }

/**
     * Creates a nested array representing the structure of a directory
     *
     * System::_dirToStruct('dir1', 0) =>
     *   Array
     *    (
     *    [dirs] => Array
     *        (
     *            [0] => dir1
     *        )
     *
     *    [files] => Array
     *        (
     *            [0] => dir1/file2
     *            [1] => dir1/file3
     *        )
     *    )
     * @param    string  $sPath      Name of the directory
     * @param    integer $maxinst    max. deep of the lookup
     * @param    integer $aktinst    starting deep of the lookup
     * @param    bool    $silent     if true, do not emit errors.
     * @return   array   the structure of the dir
     */
    protected static function _dirToStruct($sPath, $maxinst, $aktinst = 0, $silent = false)
    {
        $struct = array('dirs' => array(), 'files' => array());
        if (($dir = @opendir($sPath)) === false) {
            if (!$silent) {
                System::raiseError("Could not open dir $sPath");
            }
            return $struct; // XXX could not open error
        }

$struct['dirs'][] = $sPath = realpath($sPath); // XXX don't add if '.' or '..' ?
        $list = array();
        while (false !== ($file = readdir($dir))) {
            if ($file != '.' && $file != '..') {
                $list[] = $file;
            }
        }

closedir($dir);
        natsort($list);
        if ($aktinst < $maxinst || $maxinst == 0) {
            foreach ($list as $val) {
                $path = $sPath . DIRECTORY_SEPARATOR . $val;
                if (is_dir($path) && !is_link($path)) {
                    $tmp    = System::_dirToStruct($path, $maxinst, $aktinst+1, $silent);
                    $struct = array_merge_recursive($struct, $tmp);
                } else {
                    $struct['files'][] = $path;
                }
            }
        }

return $struct;
    }

/**
     * Creates a nested array representing the structure of a directory and files
     *
     * @param    array $files Array listing files and dirs
     * @return   array
     * @static
     * @see System::_dirToStruct()
     */
    protected static function _multipleToStruct($files)
    {
        $struct = array('dirs' => array(), 'files' => array());
        settype($files, 'array');
        foreach ($files as $file) {
            if (is_dir($file) && !is_link($file)) {
                $tmp    = System::_dirToStruct($file, 0);
                $struct = array_merge_recursive($tmp, $struct);
            } else {
                if (!in_array($file, $struct['files'])) {
                    $struct['files'][] = $file;
                }
            }
        }
        return $struct;
    }

/**
     * The rm command for removing files.
     * Supports multiple files and dirs and also recursive deletes
     *
     * @param    string  $args   the arguments for rm
     * @return   mixed   PEAR_Error or true for success
     * @static
     * @access   public
     */
    public static function rm($args)
    {
        $opts = System::_parseArgs($args, 'rf'); // "f" does nothing but I like it :-)
        if (PEAR::isError($opts)) {
            return System::raiseError($opts);
        }
        foreach ($opts[0] as $opt) {
            if ($opt[0] == 'r') {
                $do_recursive = true;
            }
        }
        $ret = true;
        if (isset($do_recursive)) {
            $struct = System::_multipleToStruct($opts[1]);
            foreach ($struct['files'] as $file) {
                if (!@unlink($file)) {
                    $ret = false;
                }
            }

rsort($struct['dirs']);
            foreach ($struct['dirs'] as $dir) {
                if (!@rmdir($dir)) {
                    $ret = false;
                }
            }
        } else {
            foreach ($opts[1] as $file) {
                $delete = (is_dir($file)) ? 'rmdir' : 'unlink';
                if (!@$delete($file)) {
                    $ret = false;
                }
            }
        }
        return $ret;
    }

/**
     * Make directories.
     *
     * The -p option will create parent directories
     * @param    string  $args    the name of the director(y|ies) to create
     * @return   bool    True for success
     */
    public static function mkDir($args)
    {
        $opts = System::_parseArgs($args, 'pm:');
        if (PEAR::isError($opts)) {
            return System::raiseError($opts);
        }

$mode = 0777; // default mode
        foreach ($opts[0] as $opt) {
            if ($opt[0] == 'p') {
                $create_parents = true;
            } elseif ($opt[0] == 'm') {
                // if the mode is clearly an octal number (starts with 0)
                // convert it to decimal
                if (strlen($opt[1]) && $opt[1][0] == '0') {
                    $opt[1] = octdec($opt[1]);
                } else {
                    // convert to int
                    $opt[1] += 0;
                }
                $mode = $opt[1];
            }
        }

$ret = true;
        if (isset($create_parents)) {
            foreach ($opts[1] as $dir) {
                $dirstack = array();
                while ((!file_exists($dir) || !is_dir($dir)) &&
                        $dir != DIRECTORY_SEPARATOR) {
                    array_unshift($dirstack, $dir);
                    $dir = dirname($dir);
                }

while ($newdir = array_shift($dirstack)) {
                    if (!is_writeable(dirname($newdir))) {
                        $ret = false;
                        break;
                    }

if (!mkdir($newdir, $mode)) {
                        $ret = false;
                    }
                }
            }
        } else {
            foreach($opts[1] as $dir) {
                if ((@file_exists($dir) || !is_dir($dir)) && !mkdir($dir, $mode)) {
                    $ret = false;
                }
            }
        }

return $ret;
    }

/**
     * Concatenate files
     *
     * Usage:
     * 1) $var = System::cat('sample.txt test.txt');
     * 2) System::cat('sample.txt test.txt > final.txt');
     * 3) System::cat('sample.txt test.txt >> final.txt');
     *
     * Note: as the class use fopen, urls should work also
     *
     * @param    string  $args   the arguments
     * @return   boolean true on success
     */
    public static function &cat($args)
    {
        $ret = null;
        $files = array();
        if (!is_array($args)) {
            $args = preg_split('/\s+/', $args, -1, PREG_SPLIT_NO_EMPTY);
        }

$count_args = count($args);
        for ($i = 0; $i < $count_args; $i++) {
            if ($args[$i] == '>') {
                $mode = 'wb';
                $outputfile = $args[$i+1];
                break;
            } elseif ($args[$i] == '>>') {
                $mode = 'ab+';
                $outputfile = $args[$i+1];
                break;
            } else {
                $files[] = $args[$i];
            }
        }
        $outputfd = false;
        if (isset($mode)) {
            if (!$outputfd = fopen($outputfile, $mode)) {
                $err = System::raiseError("Could not open $outputfile");
                return $err;
            }
            $ret = true;
        }
        foreach ($files as $file) {
            if (!$fd = fopen($file, 'r')) {
                System::raiseError("Could not open $file");
                continue;
            }
            while ($cont = fread($fd, 2048)) {
                if (is_resource($outputfd)) {
                    fwrite($outputfd, $cont);
                } else {
                    $ret .= $cont;
                }
            }
            fclose($fd);
        }
        if (is_resource($outputfd)) {
            fclose($outputfd);
        }
        return $ret;
    }

/**
     * Creates temporary files or directories. This function will remove
     * the created files when the scripts finish its execution.
     *
     * Usage:
     *   1) $tempfile = System::mktemp("prefix");
     *   2) $tempdir  = System::mktemp("-d prefix");
     *   3) $tempfile = System::mktemp();
     *   4) $tempfile = System::mktemp("-t /var/tmp prefix");
     *
     * prefix -> The string that will be prepended to the temp name
     *           (defaults to "tmp").
     * -d     -> A temporary dir will be created instead of a file.
     * -t     -> The target dir where the temporary (file|dir) will be created. If
     *           this param is missing by default the env vars TMP on Windows or
     *           TMPDIR in Unix will be used. If these vars are also missing
     *           c:\windows\temp or /tmp will be used.
     *
     * @param   string  $args  The arguments
     * @return  mixed   the full path of the created (file|dir) or false
     * @see System::tmpdir()
     */
    public static function mktemp($args = null)
    {
        static $first_time = true;
        $opts = System::_parseArgs($args, 't:d');
        if (PEAR::isError($opts)) {
            return System::raiseError($opts);
        }

foreach ($opts[0] as $opt) {
            if ($opt[0] == 'd') {
                $tmp_is_dir = true;
            } elseif ($opt[0] == 't') {
                $tmpdir = $opt[1];
            }
        }

$prefix = (isset($opts[1][0])) ? $opts[1][0] : 'tmp';
        if (!isset($tmpdir)) {
            $tmpdir = System::tmpdir();
        }

if (!System::mkDir(array('-p', $tmpdir))) {
            return false;
        }

$tmp = tempnam($tmpdir, $prefix);
        if (isset($tmp_is_dir)) {
            unlink($tmp); // be careful possible race condition here
            if (!mkdir($tmp, 0700)) {
                return System::raiseError("Unable to create temporary directory $tmpdir");
            }
        }

$GLOBALS['_System_temp_files'][] = $tmp;
        if (isset($tmp_is_dir)) {
            //$GLOBALS['_System_temp_files'][] = dirname($tmp);
        }

if ($first_time) {
            PEAR::registerShutdownFunc(array('System', '_removeTmpFiles'));
            $first_time = false;
        }

return $tmp;
    }

/**
     * Remove temporary files created my mkTemp. This function is executed
     * at script shutdown time
     */
    public static function _removeTmpFiles()
    {
        if (count($GLOBALS['_System_temp_files'])) {
            $delete = $GLOBALS['_System_temp_files'];
            array_unshift($delete, '-r');
            System::rm($delete);
            $GLOBALS['_System_temp_files'] = array();
        }
    }

/**
     * Get the path of the temporal directory set in the system
     * by looking in its environments variables.
     * Note: php.ini-recommended removes the "E" from the variables_order setting,
     * making unavaible the $_ENV array, that s why we do tests with _ENV
     *
     * @return string The temporary directory on the system
     */
    public static function tmpdir()
    {
        if (OS_WINDOWS) {
            if ($var = isset($_ENV['TMP']) ? $_ENV['TMP'] : getenv('TMP')) {
                return $var;
            }
            if ($var = isset($_ENV['TEMP']) ? $_ENV['TEMP'] : getenv('TEMP')) {
                return $var;
            }
            if ($var = isset($_ENV['USERPROFILE']) ? $_ENV['USERPROFILE'] : getenv('USERPROFILE')) {
                return $var;
            }
            if ($var = isset($_ENV['windir']) ? $_ENV['windir'] : getenv('windir')) {
                return $var;
            }
            return getenv('SystemRoot') . '\temp';
        }
        if ($var = isset($_ENV['TMPDIR']) ? $_ENV['TMPDIR'] : getenv('TMPDIR')) {
            return $var;
        }
        return realpath(function_exists('sys_get_temp_dir') ? sys_get_temp_dir() : '/tmp');
    }

/**
     * The "which" command (show the full path of a command)
     *
     * @param string $program The command to search for
     * @param mixed  $fallback Value to return if $program is not found
     *
     * @return mixed A string with the full path or false if not found
     * @author Stig Bakken <ssb@php.net>
     */
    public static function which($program, $fallback = false)
    {
        // enforce API
        if (!is_string($program) || '' == $program) {
            return $fallback;
        }

// full path given
        if (basename($program) != $program) {
            $path_elements[] = dirname($program);
            $program = basename($program);
        } else {
            $path = getenv('PATH');
            if (!$path) {
                $path = getenv('Path'); // some OSes are just stupid enough to do this
            }

$path_elements = explode(PATH_SEPARATOR, $path);
        }

if (OS_WINDOWS) {
            $exe_suffixes = getenv('PATHEXT')
                                ? explode(PATH_SEPARATOR, getenv('PATHEXT'))
                                : array('.exe','.bat','.cmd','.com');
            // allow passing a command.exe param
            if (strpos($program, '.') !== false) {
                array_unshift($exe_suffixes, '');
            }
        } else {
            $exe_suffixes = array('');
        }

foreach ($exe_suffixes as $suff) {
            foreach ($path_elements as $dir) {
                $file = $dir . DIRECTORY_SEPARATOR . $program . $suff;
                // It's possible to run a .bat on Windows that is_executable
                // would return false for. The is_executable check is meaningless...
                if (OS_WINDOWS) {
                    if (file_exists($file)) {
                        return $file;
                    }
                } else {
                    if (is_executable($file)) {
                        return $file;
                    }
                }
            }
        }
        return $fallback;
    }

/**
     * The "find" command
     *
     * Usage:
     *
     * System::find($dir);
     * System::find("$dir -type d");
     * System::find("$dir -type f");
     * System::find("$dir -name *.php");
     * System::find("$dir -name *.php -name *.htm*");
     * System::find("$dir -maxdepth 1");
     *
     * Params implemented:
     * $dir            -> Start the search at this directory
     * -type d         -> return only directories
     * -type f         -> return only files
     * -maxdepth <n>   -> max depth of recursion
     * -name <pattern> -> search pattern (bash style). Multiple -name param allowed
     *
     * @param  mixed Either array or string with the command line
     * @return array Array of found files
     */
    public static function find($args)
    {
        if (!is_array($args)) {
            $args = preg_split('/\s+/', $args, -1, PREG_SPLIT_NO_EMPTY);
        }
        $dir = realpath(array_shift($args));
        if (!$dir) {
            return array();
        }
        $patterns = array();
        $depth = 0;
        $do_files = $do_dirs = true;
        $args_count = count($args);
        for ($i = 0; $i < $args_count; $i++) {
            switch ($args[$i]) {
                case '-type':
                    if (in_array($args[$i+1], array('d', 'f'))) {
                        if ($args[$i+1] == 'd') {
                            $do_files = false;
                        } else {
                            $do_dirs = false;
                        }
                    }
                    $i++;
                    break;
                case '-name':
                    $name = preg_quote($args[$i+1], '#');
                    // our magic characters ? and * have just been escaped,
                    // so now we change the escaped versions to PCRE operators
                    $name = strtr($name, array('\?' => '.', '\*' => '.*'));
                    $patterns[] = '('.$name.')';
                    $i++;
                    break;
                case '-maxdepth':
                    $depth = $args[$i+1];
                    break;
            }
        }
        $path = System::_dirToStruct($dir, $depth, 0, true);
        if ($do_files && $do_dirs) {
            $files = array_merge($path['files'], $path['dirs']);
        } elseif ($do_dirs) {
            $files = $path['dirs'];
        } else {
            $files = $path['files'];
        }
        if (count($patterns)) {
            $dsq = preg_quote(DIRECTORY_SEPARATOR, '#');
            $pattern = '#(^|'.$dsq.')'.implode('|', $patterns).'($|'.$dsq.')#';
            $ret = array();
            $files_count = count($files);
            for ($i = 0; $i < $files_count; $i++) {
                // only search in the part of the file below the current directory
                $filepart = basename($files[$i]);
                if (preg_match($pattern, $filepart)) {
                    $ret[] = $files[$i];
                }
            }
            return $ret;
        }
        return $files;
    }
}

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EDIT :: System.php