3v4l.org

run code in 300+ PHP versions simultaneously
<?php // New syntax since PHP 7.4 $a = [3, 2, 5, 6, 1]; usort($a, fn($a, $b) => $a<=>$b); foreach ($a as $key => $value) { echo "$key: $value\n"; }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
0: 1 1: 2 2: 3 3: 5 4: 6
Output for 7.3.0 - 7.3.33
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ')' in /in/c0n8c on line 6
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ',' or ')' in /in/c0n8c on line 6
Process exited with code 255.
preferences:
75.89 ms | 408 KiB | 5 Q