3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(){ return "Foo \n"; } $foo = 'foo'; var_dump($foo); // string(3) "foo" var_dump($foo()); // NULL. Why?
Output for 7.1.25 - 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(3) "foo" string(5) "Foo "
preferences:
142.18 ms | 403 KiB | 184 Q