system.php

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        $files = array();
        if (!is_array($args)) {
            $args = preg_split('/\s+/', $args, -1, PREG_SPLIT_NO_EMPTY);
        }
        for($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];
            }
        }
        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($fd, 2048)) {
                if (isset($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  $args  The arguments
    * @return  mixed   the full path of the created (file|dir) or false
    * @see System::tmpdir()
    * @access  public
    */
    function mktemp($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'][] = $tmp;
        if ($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
    *
    * @access private
    */
    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 $_ENV array, that s why we do tests with _ENV
    *
    * @return string The temporal directory on the system
    */
    function tmpdir()
    {
        if (OS_WINDOWS) {
            if ($var = isset($_ENV['TEMP']) ? $_ENV['TEMP'] : getenv('TEMP')) {
                return $var;
            }
            if ($var = isset($_ENV['TMP']) ? $_ENV['TMP'] : getenv('TMP')) {
                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 '/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 $program is not found
    *
    * @return mixed A string with the full path or false if not found
    * @author Stig Bakken <[e-mail]>
    */
    function which($program, $fallback = false)
    {
        // avaible since 4.3.0RC2
        if (defined('PATH_SEPARATOR')) {
            $path_delim = PATH_SEPARATOR;
        } else {
            $path_delim = OS_WINDOWS ? ';' : ':';
        }
        // full path given
        if (basename($program) != $program) {
            $path_elements[] = dirname($program);
            $program = basename($program);
        } else {
            // Honor safe mode
            if (!ini_get('safe_mode') || !$path = ini_get('safe_mode_exec_dir')) {
                $path = getenv('PATH');
                if (!$path) {
                    $path = getenv('Path'); // some OSes are just stupid enough to do this
                }
            }
            $path_elements = explode($path_delim, $path);
        }

        if (OS_WINDOWS) {
            $exe_suffixes = getenv('PATHEXT')
                                ? explode($path_delim, getenv('PATHEXT'))
                                : array('.exe','.bat','.cmd','.com');
            // allow passing a command.exe param
            if (strpos($program, '.') !== false) {
                array_unshift($exe_suffixes, '');
            }
            // is_executable() is not available on windows for PHP4
            $pear_is_executable = (function_exists('is_executable')) ? 'is_executable' : 'is_file';
        } else {
            $exe_suffixes = array('');
            $pear_is_executable = 'is_executable';
        }

        foreach ($exe_suffixes as $suff) {
            foreach ($path_elements as $dir) {
                $file = $dir . DIRECTORY_SEPARATOR . $program . $suff;
                if ($pear_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 implmented:
    * $dir            -> Start the search at this directory
    * -type d         -> return only directories
    * -type f         -> return only files
    * -maxdepth <n>   -> max depth of recursion
    * -name <pattern> -> search pattern (bash style). Multiple -name param allowed
    *
    * @param  mixed Either array or string with the command line
    * @return array Array of found files
    *
    */
    function find($args)
    {
        if (!is_array($args)) {
            $args = preg_split('/\s+/', $args, -1, PREG_SPLIT_NO_EMPTY);
        }
        $dir = array_shift($args);
        $patterns = array();
        $depth = 0;
        $do_files = $do_dirs = true;
        for ($i = 0; $i < count($args); $i++) {
            switch ($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;
                        }
                    }
                    $i++;
                    break;
                case '-name':
                    if (OS_WINDOWS) {
                        if ($args[$i+1]{0} == '\\') {
                            // prepend drive
                            $args[$i+1] = addslashes(substr(getcwd(), 0, 2) . $args[$i + 1]);
                        }
                    }
                    $patterns[] = "(" . preg_replace(array('/\./', '/\*/'),
                                                     array('\.', '.*', ),
                                                     $args[$i+1])
                                      . ")";
                    $i++;
                    break;
                case '-maxdepth':
                    $depth = $args[$i+1];
                    break;
            }
        }
        $path = System::_dirToStruct($dir, $depth);
        if ($do_files && $do_dirs) {
            $files = array_merge($path['files'], $path['dirs']);
        } elseif ($do_dirs) {
            $files = $path['dirs'];
        } else {
            $files = $path['files'];
        }
        if (count($patterns)) {
            $patterns = implode('|', $patterns);
            $ret = array();
            for ($i = 0; $i < count($files); $i++) {
                if (preg_match("#^$patterns\$#", $files[$i])) {
                    $ret[] = $files[$i];
                }
            }
            return $ret;
        }
        return $files;
    }
}
?>