[PHP] Rename files in directory subdirectories

rename_all_files_in_subdirectories.php

<?php

	/*------------------------------------------------------------------------------------------------
		This specific case assumes the following structure. Please note the absence of file extensions.
		MAIN_DIR
			- xyz (dir)
				-- abc123-jpg (file)
				-- xyz456-png (file)
				-- jkl123-jpg-300x300 (file)
				-- oiu456-png-300x300 (file)
			- def (dir)
				-- vbn456-png (file)
				-- lkj123-jpg-300x300 (file)
			- etc. (dirs)
	---------------------------------------------------------------------------------------------- */
	
	// This part is only useful if you are using WordPress ...
	// ... and if the files you want to rename are in a subdirectory of /wp-content/uploads
	/*$wp_upload = wp_upload_dir();
    $wp_upload_dir = trailingslashit( $wp_upload["basedir"] );
    $folder_name = trailingslashit( 'test_rename' ); // change this
    $uploads_dir = trailingslashit( $wp_upload_dir . $folder_name);*/

    $uploads_dir = '/path/to/dir/'; // change this if you are not using the part above, otherwise delete line
	
	// Retrieves subdirectories
    $directories = glob($uploads_dir . '*' , GLOB_ONLYDIR);
	
	// Let's set what we need to change and what we need to replace it with
    $change_1 = '-jpg';
    $replace_1 = '.jpg';
    $change_2 = '-png';
    $replace_2 = '.png';
    $remove_1 = '-jpg-';
    $remove_2 = '-png-';

    foreach($directories as $dir) {
        if ($handle = opendir($dir)) {
            while (false !== ($fileName = readdir($handle))) {

                // skip weird stuff
                if($fileName == '.' || $fileName == '..')
                    continue;

                // skip if file already has extension in place
                $ext = substr($fileName, -4);
                if($ext == $replace_1 || $ext == $replace_2)
                    continue;

                // cleanup
                if(preg_match('/'.$remove_1.'/',$fileName)) {
                    $newName = str_replace($remove_1,'-',$fileName);
                    rename($dir.'/'.$fileName, $dir.'/'.$newName.$replace_1);
                } elseif(preg_match('/'.$remove_2.'/',$fileName)) {
                    $newName = str_replace($remove_2,'-',$fileName);
                    rename($dir.'/'.$fileName, $dir.'/'.$newName.$replace_2);
                }

                // first replacement
                elseif (preg_match('/'.$change_1.'/',$fileName)) {
                    $newName = str_replace($change_1,$replace_1,$fileName);
                    rename($dir.'/'.$fileName, $dir.'/'.$newName);
                }
                // second replacement
                elseif(preg_match('/'.$change_2.'/',$fileName)) {
                    $newName = str_replace($change_2,$replace_2,$fileName);
                    rename($dir.'/'.$fileName, $dir.'/'.$newName);
                }

            }
            closedir($handle);
        }
    }


?>