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<?php $old = array( array( 'id' => 4, 'label' => 'foo' ), array( 'id' => 6, 'label' => 'baz' ), ); $new = array_map(function($a){ return array($a['id']=>$a['label']); },$old); print_r($new);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [4] => foo ) [1] => Array ( [6] => baz ) )

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