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 = $a; var_dump(json_encode($a));
Output for 5.5.0 - 7.1.0
bool(false)
Output for 5.2.0 - 5.4.45
Warning: json_encode(): recursion detected in /in/kmoce on line 17 string(22) "{"b":{"a":{"b":null}}}"
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/kmoce on line 17
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/kmoce 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/kmoce 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/kmoce on line 5
Process exited with code 255.