3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1,2,3,4); $b = &$a; foreach($b as $i => $v) { echo "$i => $v\n"; /*if (isset($b[$i+1])) { $b[$i+1] += 1; }*/ unset($b[$i+1]); } var_dump($a, $b);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
0 => 1 1 => 2 2 => 3 3 => 4 array(1) { [0]=> int(1) } array(1) { [0]=> int(1) }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
0 => 1 2 => 3 array(2) { [0]=> int(1) [2]=> int(3) } array(2) { [0]=> int(1) [2]=> int(3) }
preferences:
190.19 ms | 402 KiB | 197 Q