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<?php $a = array(5 => true,4 => true,8 => true,6 => true); $b = array(5 => true,4 => true,6 => true,9 => true); print_r(array_diff_key($a,$b));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [8] => 1 )

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