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run code in 150+ php & hhvm versions
Bugs & Features
<?php class Test { public function __toString() { return $this->to_string(); } public function to_string() { $s = (string)$this; return $s; } } $t = new Test; $t->to_string();
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0

Process exited with code 139.
Output for hhvm-3.12.0
Assertion failure: /build/hhvm/src/hhvm-HHVM-3.12.0/hphp/runtime/base/runtime-error.cpp:48: void HPHP::raise_error(const string&): assertion `0' failed.
Process exited with code 134.
Output for hhvm-3.10.0
Fatal error: Stack overflow in /in/ZhSKg on line 7
Process exited with code 255.
Output for 5.0.0 - 5.1.6
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/ZhSKg 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/ZhSKg 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/ZhSKg on line 5
Process exited with code 255.