3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1=>"a",2=>"b",3=>"c",4=>"d"); foreach($a as $key=>$value) { $a[$key]=$value+2; } print_r($a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: Unsupported operand types: string + int in /in/HShdg:5 Stack trace: #0 {main} thrown in /in/HShdg on line 5
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: A non-numeric value encountered in /in/HShdg on line 5 Warning: A non-numeric value encountered in /in/HShdg on line 5 Warning: A non-numeric value encountered in /in/HShdg on line 5 Warning: A non-numeric value encountered in /in/HShdg on line 5 Array ( [1] => 2 [2] => 2 [3] => 2 [4] => 2 )
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20
Array ( [1] => 2 [2] => 2 [3] => 2 [4] => 2 )
preferences:
186.25 ms | 402 KiB | 256 Q