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 - 7.4.26, 8.0.0 - 8.0.13, 8.1rc1 - rc3
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 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ',' or ')' in /in/c0n8c on line 6
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW) in /in/c0n8c on line 6
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, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/c0n8c 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/c0n8c on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/c0n8c on line 4
Process exited with code 255.

preferences:
66.78 ms | 539 KiB | 13 Q