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<?php $list = array( array('hostname' => 'example.org'), array('hostname' => 'www.example.org'), array('hostname' => 'example.example.org'), ); $keys = array_column($list, 'hostname'); var_dump($keys);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(11) "example.org" [1]=> string(15) "www.example.org" [2]=> string(19) "example.example.org" }

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