3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [ 0 => 'first value', 'firstkey' => 'first value', 1 => 'second value', 'secondkey' => 'second value', 3 => 'third value', 'thirdkey' => 'third value', ]; var_dump($a); var_dump($a[0], $a['firstkey']);
Output for 7.1.0 - 7.1.22, 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 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
array(6) { [0]=> string(11) "first value" ["firstkey"]=> string(11) "first value" [1]=> string(12) "second value" ["secondkey"]=> string(12) "second value" [3]=> string(11) "third value" ["thirdkey"]=> string(11) "third value" } string(11) "first value" string(11) "first value"
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 array(6) { [0]=> string(11) "first value" ["firstkey"]=> string(11) "first value" [1]=> string(12) "second value" ["secondkey"]=> string(12) "second value" [3]=> string(11) "third value" ["thirdkey"]=> string(11) "third value" } string(11) "first value" string(11) "first value"

preferences:
162.88 ms | 403 KiB | 171 Q