3v4l.org

run code in 300+ PHP versions simultaneously
<?php function imageFilename($arr) { return $arr; } var_dump(array(1) + array(2)); var_dump(array_filter(array_map('imageFilename', array('a' => 2))) + array('b' => 1));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(1) { [0]=> int(1) } array(2) { ["a"]=> int(2) ["b"]=> int(1) }
preferences:
355.87 ms | 406 KiB | 424 Q