recursive chmod files with php

There may be shorter solution using a shell script (using 'find' e.g.), but I needed it to be in PHP.

<?php

/**
 * function will chmod dirs and files recursively
 * @param type $start_dir 
 * @param type $debug (set false if you don't want the function to echo)
 */
function chmod_recursive($start_dir, $debug = true) {
    $dir_perms = 0755;
    $file_perms = 0644;

    $str = "";
    $files = array();
    if (is_dir($start_dir)) {
        $fh = opendir($start_dir);
        while (($file = readdir($fh)) !== false) {
            // skip hidden files and dirs and recursing if necessary
            if (strpos($file, '.')=== 0) continue;

            $filepath = $start_dir . '/' . $file;
            if ( is_dir($filepath) ) {
                //$newname = sanitize_file_name($filepath);
                echo $str = "chmod $filepath To $dir_perms\n";
                chmod($filepath, $dir_perms);
                chmod_recursive($filepath);
            } else {
                ////$newname = sanitize_file_name($filepath);
                echo $str = "chmod $filepath tp $file_perms\n";
                chmod($filepath, $file_perms);
            }
        }
        closedir($fh);
    }
    if ($debug) {
        echo $str;
    }
}

// settings 

$start_dir = '/home/dennis/www/default';
$files = chmod_recursive($start_dir);

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