<?php
	$text = "Hello World!";
	$image = new Imagick();
	$draw = new ImagickDraw();
	$color = new ImagickPixel('#f00');
	$draw->setFontSize(50);
	$draw->setFillColor($color);
	$draw->setStrokeAntialias(true);
	$draw->setTextAntialias(true);

	$metrics = $image->queryFontMetrics($draw, $text, false);

	echo $metrics['textWidth'];
	exit;