Get text height, width

define("F_SIZE", 8);
define("F_FONT", "arial.ttf");


function get_bbox($text){
	return imagettfbbox(F_SIZE, 0, F_FONT, $text);
	}
	
function text_height ($text) {
	$box = get_bbox($text);
	$height = $box[3] - $box[5];
	return $height;
	}
	
function text_width ($text) {
	$box = get_bbox($text);
	$width = $box[4] - $box[6];
	return $width;
	}