Make filename friendly (slug it) recursively by giving a path directory.

friendly-filename.php

<?php

// Usage:
// 1. Open console
// 2. Go to desired folder and run the script by:
//    $  php friendly-filename.php 
// Optional: You can pass the desired folder by argument:
//    $  php friendly-filename.php /desired/folder/I/want/to/make/it/friendly


function getFriendlyFilename($filename,$extension) {
    setlocale(LC_CTYPE, 'en_US.UTF8');
    $filename = iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $filename);
    $filename = preg_replace('~[^\-\pL\pN\s]+~u', '-', $filename);
    $filename = str_replace(' ', '-', $filename);
    $filename = trim($filename, "-");
    $filename = strtolower($filename);
    return $filename.".".$extension;
}

// Get absolute path where script is runned
$path = dirname(__FILE__);

// If you want, you can pass by argument a new path
if(isset($argv[1])){
	if(is_dir($argv[1])){
		$path = $argv[1];
	}
}

// Build iterator
$rii = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path));

foreach ($rii as $file) {

	// Check if dir, to continue
    if ($file->isDir()){
    	print_r("\t".$file->getPath()."\n\t---------------------- \n"); 
        continue;
    }

    // Get filename
    $filename = $file->getBasename('.'.$file->getExtension());
    // Get extension
    $extension = $file->getExtension();

    // Build new name
    $newName = getFriendlyFilename($filename,$extension); 

    // Set Old path
    $oldPath = $file->getPathname();
    // Set new path
    $newPath = $file->getPath()."/".$newName;

    // Rename old info to new info
    rename($oldPath,$newPath);
    // Output processed file
    print_r("\tOld: ".$oldPath." \n\tNew: ".$newPath."\n\n");

}


?>