Minify CSS

function compressCss($css) {
	$css = preg_replace('~/\*.*?\*/~s','',$css); // comments
	$css = str_replace(array("\n","\t","\r"),'',$css); // newlines and tabs
	$css = preg_replace('/: */',':',$css); // space after colons
	$css = preg_replace('/ *(;|\{|\}) */','$1',$css); // space before/after semicolons and braces
	$css = str_replace(';}','}',$css); // remove final semicolon
	$css = trim($css);
	return $css;
}