Calculate aspect ratio

This is a handy little function I’ve used a few times to calculate the aspect ratio of an image or video. Simply give it the width and height and it’ll give you the aspect ratio.

<?php function ratio($a, $b) { $gcd = function($a, $b) use (&$gcd) { return ($a % $b) ? $gcd($b, $a % $b) : $b; }; $g = $gcd($a, $b); return $a/$g . ':' . $b/$g; } echo ratio(1920, 1080); // 16:9 echo "\n"; echo ratio(640, 480); // 4:3

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