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run code in 150+ php & hhvm versions
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<?php function imageFilename($arr) { return $arr; } var_dump(array_filter(array_map('imageFilename', array(1))) + array(2));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(1) { [0]=> int(1) }