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<?php $array = [ 'id1' => ['primary_key' => '123', 'test' => 'test'], 'id2' => ['primary_key' => '123', 'test' => 'test'], 'id3' => ['primary_key' => '123', 'test' => 'test'] ]; var_dump(array_column($array, 'primary_key'));
Output for git.master, git.master_jit
array(3) { [0]=> string(3) "123" [1]=> string(3) "123" [2]=> string(3) "123" }

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