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<?php $mainArray = array(23 => array(21,23,20), 21 => array(21,23,23), 24 => array(21,23,20)); $newArray = array(); foreach($mainArray as $key => $value) { if (in_array(20, $value)) { $newArray[] = $key; } } echo var_dump($newArray);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> int(23) [1]=> int(24) }

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