3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array_fill(0, 1000, 5); $copy = array(); foreach( $array as $i => $foobar ) { $copy[$i+10] = $foobar; } foreach( $copy as $i => &$foobar ) { $array[$i-10] = $foobar = 10; } echo $array[0]; echo $copy[10];

preferences:
43.8 ms | 402 KiB | 5 Q