Cache-bust all scripts/styles

custom.php

<?php
 /**
  * Cache-bust all scripts/styles. form helgatheviking 
  *
  * Can go to your functions.php.
  * Useful for development purposes.
  * Special thanks to HelgaTheViking.
  */ 
function pekky_add_timestamp_css_js( $src ) {
	if ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) {
		$src = add_query_arg( 'time', time(), $src );
	}
	return $src;
}
 add_filter( 'style_loader_src', 'pekky_add_timestamp_css_js', 9999 );
add_filter( 'script_loader_src', 'pekky_add_timestamp_css_js', 9999 );