3v4l.org

run code in 500+ PHP versions simultaneously
<?php declare(strict_types=1); // strict types are enabled, all three examples should emit wrong key type exception ['1' => true]; $a = '1'; [$a => true]; [1 => true][$a]; // ie. emit type exception when the key type is different than it will be, ie. int for numeric input, otherwise string
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 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/epv5s on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected '[' in /in/epv5s on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/epv5s on line 4
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Warning: Unsupported declare 'strict_types' in /in/epv5s on line 1
Output for 5.4.0 - 5.4.45
Warning: Unsupported declare 'strict_types' in /in/epv5s on line 1 Parse error: syntax error, unexpected '[' in /in/epv5s on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Warning: Unsupported declare 'strict_types' in /in/epv5s on line 1 Parse error: syntax error, unexpected '[' in /in/epv5s on line 4
Process exited with code 255.
preferences:
39.65 ms | 1168 KiB | 25 Q