3v4l.org

run code in 500+ PHP versions simultaneously
<?php $array = array("a", "b", "c", "d", "e", "f"); foreach ( $array as $key => &$value ) { echo "$key: $value\n"; if ( $value == "b" ) array_splice($array, $key, 1, array("x", "y")); } print_r($array);
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
0: a 1: b 6: f Array ( [0] => a [1] => x [2] => y [3] => c [4] => d [5] => e [6] => f )
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
0: a 1: b 0: a 1: x 2: y 3: c 4: d 5: e 6: f Array ( [0] => a [1] => x [2] => y [3] => c [4] => d [5] => e [6] => f )
preferences:
104.25 ms | 2170 KiB | 4 Q