3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array(1); $a =& $arr[0]; //$a and $arr[0] are in the same reference set $arr2 = $arr; //not an assignment-by-reference! $arr2[0]++; var_export($a); echo '<br/>'; var_export($arr); echo '<br/>'; var_export($arr2);

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50.5 ms | 402 KiB | 5 Q