3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class A { public function __toString() { return null; } } $array = array(); $a = new A; $array[(string) $a] = $a; $array[(string) $a] = $a; var_dump($array);
Output for 7.1.0
Recoverable fatal error: Method A::__toString() must return a string value in /in/Vvt5d on line 12
Process exited with code 255.
Output for 5.2.0 - 5.6.25, hhvm-3.10.0, 7.0.0 - 7.0.14
Catchable fatal error: Method A::__toString() must return a string value in /in/Vvt5d on line 12
Process exited with code 255.
Output for hhvm-3.12.0
Fatal error: Uncaught Error: Method A::__toString() must return a string value in /in/Vvt5d:12 Stack trace: #0 {main}
Process exited with code 255.
Output for 5.0.0 - 5.1.6
array(1) { ["Object id #1"]=> object(A)#1 (0) { } }
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/Vvt5d on line 4
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/Vvt5d on line 4
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/Vvt5d on line 4
Process exited with code 255.