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<?php $a = [1, 2, 3]; $b = array_map(function ($_) { if ($_ === 1) return 4; }, $a); var_dump($b); var_dump(array_filter($b));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> int(4) [1]=> NULL [2]=> NULL } array(1) { [0]=> int(4) }

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