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<?php $size = '350x250i'; // 350 + 250 + i preg_match('/^(\d+)x(\d+)(i|o)$/', $size, $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(8) "350x250i" [1]=> string(3) "350" [2]=> string(3) "250" [3]=> string(1) "i" }