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<?php $array = array('apple', 'orange', 'banana',[]); $array = array_combine($array,$array); var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Array to string conversion in /in/I37j6 on line 4 array(4) { ["apple"]=> string(5) "apple" ["orange"]=> string(6) "orange" ["banana"]=> string(6) "banana" ["Array"]=> array(0) { } }

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