3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array1 = ['red', 'green', 'blue', 'yellow']; $array2 = [45 => 'start']; foreach ($array1 as $item) { $array2[] = $item; end($array2); echo "$item inserted as ", key($array2), PHP_EOL; } var_export($array2);
Output for 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 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
red inserted as 46 green inserted as 47 blue inserted as 48 yellow inserted as 49 array ( 45 => 'start', 46 => 'red', 47 => 'green', 48 => 'blue', 49 => 'yellow', )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 red inserted as 46 green inserted as 47 blue inserted as 48 yellow inserted as 49 array ( 45 => 'start', 46 => 'red', 47 => 'green', 48 => 'blue', 49 => 'yellow', )

preferences:
124.54 ms | 402 KiB | 184 Q