3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace NS { class Foo { public static function bar($i = DEF) { return constant(__NAMESPACE__ . '\\true'); } } } namespace { define('NS\\DEF', 'ddd'); var_dump(NS\Foo::bar()); }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "NS\true" in /in/0Z0H8:9 Stack trace: #0 /in/0Z0H8(9): constant('NS\\true') #1 /in/0Z0H8(17): NS\Foo::bar() #2 {main} thrown in /in/0Z0H8 on line 9
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: constant(): Couldn't find constant NS\true in /in/0Z0H8 on line 9 NULL
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/0Z0H8 on line 3
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 T_STRING in /in/0Z0H8 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0Z0H8 on line 3
Process exited with code 255.

preferences:
288.94 ms | 401 KiB | 458 Q