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<?php $a = array( array('id' => 3, 'a' => 33), array('id' => 5, 'a' => 55), array('id' => 7, 'b' => 256), array('id' => '', 'a'=> 512), ); var_dump(array_column($a, 'a', 'id'));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [3]=> int(33) [5]=> int(55) [""]=> int(512) }

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