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run code in 300+ PHP versions simultaneously
<?php $a = array(); $a["x"] = "bb"; $a["x"][] = "cc"; print_r($a); print_r("A"); print_r(empty([])); print_r("A"); print_r(empty(array())); print_r("A"); print_r(empty($a)); print_r(array_merge([1,[2,3]],[1])); ?>

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46.81 ms | 402 KiB | 5 Q