3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function registerCallback(callable $method) { // do something with $method var_dump($method); } class A { public function __construct() { registerCallback([$this, "cb"]); } public function cb() { // do somethin upon being invoked } } new A();
Output for 5.4.0 - 7.1.7, 7.1.20 - 7.3.0rc4
array(2) { [0]=> object(A)#1 (0) { } [1]=> string(2) "cb" }
Output for 7.1.10

Process exited with code 137.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/7sP3S on line 11
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ')' in /in/7sP3S on line 11
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/7sP3S on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/7sP3S on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/7sP3S on line 3
Process exited with code 255.