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run code in 150+ php & hhvm versions
Bugs & Features
<?php // Everything you enter here will be executed by our servers. Try it! class A { public $b; public function A(B $b = null){ $this->b = $b; } } class B { public $a; public function B(A $a = null) { $this->a = $a; } } var_dump(new A(new B(new A())));
Output for 7.0.0 - 7.1.0
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; A has a deprecated constructor in /in/c3Y8W on line 4 Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; B has a deprecated constructor in /in/c3Y8W on line 12 object(A)#1 (1) { ["b"]=> object(B)#2 (1) { ["a"]=> object(A)#3 (1) { ["b"]=> NULL } } }
Output for 5.1.0 - 5.6.28, hhvm-3.10.0 - 3.13.2
object(A)#1 (1) { ["b"]=> object(B)#2 (1) { ["a"]=> object(A)#3 (1) { ["b"]=> NULL } } }
Output for 5.0.0 - 5.0.5
Fatal error: Argument 1 must not be null in /in/c3Y8W on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/c3Y8W on line 5
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 T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/c3Y8W on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/c3Y8W on line 5
Process exited with code 255.