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run code in 150+ php & hhvm versions
Bugs & Features
<?php set_error_handler(array('My_ToStringFixer', 'errorHandler')); error_reporting(E_ALL | E_STRICT); class My_ToStringFixer { protected static $_toStringException; public static function errorHandler($errorNumber, $errorMessage, $errorFile, $errorLine) { if (isset(self::$_toStringException)) { $exception = self::$_toStringException; // Always unset '_toStringException', we don't want a straggler to be found later if something came between the setting and the error self::$_toStringException = null; if (preg_match('~^Method .*::__toString\(\) must return a string value$~', $errorMessage)) throw $exception; } return false; } public static function throwToStringException($exception) { // Should not occur with prescribed usage, but in case of recursion: clean out exception, return a valid string, and weep if (isset(self::$_toStringException)) { self::$_toStringException = null; return ''; } self::$_toStringException = $exception; return null; } } class My_Class { public function doComplexStuff() { throw new Exception('Oh noes!'); } public function __toString() { try { // do your complex thing which might trigger an exception return $this->doComplexStuff(); } catch (Exception $e) { // The 'return' is required to trigger the trick return My_ToStringFixer::throwToStringException($e); } } } $x = new My_Class(); try { echo $x; } catch (Exception $e) { echo 'Caught Exception! : '. $e; }
Output for 7.0.0 - 7.1.0
Caught Exception! : Exception: Oh noes! in /in/DI9em:41 Stack trace: #0 /in/DI9em(49): My_Class->doComplexStuff() #1 /in/DI9em(63): My_Class->__toString() #2 {main}
Output for 5.2.0 - 5.6.28, hhvm-3.10.0 - 3.12.0
Caught Exception! : exception 'Exception' with message 'Oh noes!' in /in/DI9em:41 Stack trace: #0 /in/DI9em(49): My_Class->doComplexStuff() #1 /in/DI9em(63): My_Class->__toString() #2 {main}
Output for 5.0.0 - 5.1.6
Fatal error: Method My_Class::__toString() must return a string value in /in/DI9em on line 63
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/DI9em on line 7
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/DI9em on line 7
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/DI9em on line 7
Process exited with code 255.