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<?php $array = (array) json_decode('{"1":"1","2":"1","3":"1","4":"1","12":"12"}'); var_dump($array); var_dump(array_key_exists("12", $array));
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [1]=> string(1) "1" [2]=> string(1) "1" [3]=> string(1) "1" [4]=> string(1) "1" [12]=> string(2) "12" } bool(true)

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