3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { public $b; } class B { public $a; } $a = new A; $a->b = new B; $a->b->a = $a; var_dump(unserialize(serialize($a)));
Output for 5.2.14 - 5.2.17, 5.3.3 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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
object(A)#3 (1) { ["b"]=> object(B)#4 (1) { ["a"]=> *RECURSION* } }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.13, 5.3.0 - 5.3.2
object(A)#3 (1) { ["b"]=> object(B)#4 (1) { ["a"]=> object(A)#3 (1) { ["b"]=> object(B)#4 (1) { ["a"]=> *RECURSION* } } } }
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/esgOS on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/esgOS 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/esgOS on line 5
Process exited with code 255.

preferences:
201.82 ms | 401 KiB | 329 Q