3v4l.org

run code in 200+ 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 - 7.4.0
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 4.4.2 - 4.4.9, 5.1.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/CfQeY on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected ':', expecting '{' in /in/CfQeY on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/CfQeY on line 3
Process exited with code 255.