3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class A { public $b; } class B { public $a; } $a = new A; $a->b = new B; $a->b->a = $a; var_dump(serialize($a));
Output for 5.0.0 - 7.1.0
string(44) "O:1:"A":1:{s:1:"b";O:1:"B":1:{s:1:"a";r:1;}}"
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/QKjK7 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/QKjK7 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/QKjK7 on line 5
Process exited with code 255.