3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { public function f() { $x = async function ($x) { var_dump($x); }; $x(1); } } (new A())->f();
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.6
Parse error: syntax error, unexpected 'function' (T_FUNCTION) in /in/1ilFL on line 5
Process exited with code 255.
preferences:
162.76 ms | 1395 KiB | 35 Q