3v4l.org

run code in 300+ PHP versions simultaneously
<?php class X {} function test(int $number = null):?X { return null; } echo test(); class Car { protected function startEngine($key = false){ if($key === true) { $runningEngine = true; } print_r($runningEngine); return $runningEngine; } }
Output for 7.1.0, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Output for 7.0.0
Parse error: syntax error, unexpected '?' in /in/EjqOB on line 4
Process exited with code 255.
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.16
Parse error: syntax error, unexpected ':', expecting '{' in /in/EjqOB on line 4
Process exited with code 255.
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158.14 ms | 402 KiB | 157 Q