3v4l.org

run code in 300+ PHP versions simultaneously
<?php class CallBySelf { public static function foo() { echo 'Foo', PHP_EOL; } public static function testCall() { $method = [self::class, 'foo']; var_dump(is_callable($method)); echo 'Call via call_user_func: '; call_user_func($method); echo 'Direct call: '; $method(); } } CallBySelf::testCall();
Output for 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, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
bool(true) Call via call_user_func: Foo Direct call: Foo
preferences:
154.98 ms | 408 KiB | 5 Q