3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr1 = array(1, 2, 3, 4, 5); $arr2 = array('a', 'b', 'c', 'd'); $ref = &$arr1; foreach($ref AS $key=>$val) { echo "$key => $val \r\n"; if( $val === 2) { $ref = $arr2; } }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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 4 => 5
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
0 => 1 1 => 2 0 => a 1 => b 2 => c 3 => d
preferences:
204.73 ms | 403 KiB | 312 Q