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<?php $a = [ [ "what" => "b4", "map" => "74,76,77,83" ], [ "what" => "b2", "map" => "53,82" ], [ "what" => "b1", "map" => "36" ] ]; function abc($what, $arrays) { foreach ($arrays as $array) { if ($array['what'] === $what) { return $array['map']; } } return false; } echo(abc('b4', $a)); // 74,76,77,83
Output for git.master, git.master_jit, rfc.property-hooks
74,76,77,83

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