3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(): ?callable { return function() {}; } function bar(): ?callable { return 'strpos'; } function baz(): ?callable { return 'baz'; } function qux(): ?callable { return array(new SplFixedArray(), 'fromArray'); } function quux(): ?callable { return array('SplFixedArray', 'fromArray'); } function corge(): ?callable { return 'SplFixedArray::fromArray'; } function grault(): ?callable { return null; } foo(); bar(); baz(); qux(); quux(); corge(); grault();
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
Output for 7.0.0 - 7.0.33
Parse error: syntax error, unexpected '?' in /in/CfQeY on line 3
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/CfQeY on line 3
Process exited with code 255.
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48.04 ms | 408 KiB | 5 Q