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<?php $data = array('foo' => 'bar', 'bar' => 'foo', 'lcpartner_id' => 123); var_dump(array_diff_key($data, array_flip(array())));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["foo"]=> string(3) "bar" ["bar"]=> string(3) "foo" ["lcpartner_id"]=> int(123) }

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