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<?php $array = new SplFixedArray(5); $array[0] = 'boo'; $array[1] = 'baz'; var_dump($array); var_dump(json_encode($array));
Output for git.master, git.master_jit, rfc.property-hooks
object(SplFixedArray)#1 (5) { [0]=> string(3) "boo" [1]=> string(3) "baz" [2]=> NULL [3]=> NULL [4]=> NULL } string(28) "["boo","baz",null,null,null]"

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