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<?php $a = array('first', 'second', 'third', 'first', 'fourth'); var_dump(array_unique($a));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(5) "first" [1]=> string(6) "second" [2]=> string(5) "third" [4]=> string(6) "fourth" }

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