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<?php class Hello { public function __toString() { return null; } } $h = new Hello(); echo " First " . $h->__toString() . PHP_EOL; echo " Second " . $h . PHP_EOL;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught TypeError: Hello::__toString(): Return value must be of type string, null returned in /in/dd7hD:6 Stack trace: #0 /in/dd7hD(11): Hello->__toString() #1 {main} thrown in /in/dd7hD on line 6
Process exited with code 255.
Output for 7.4.0 - 7.4.33
First Fatal error: Uncaught Error: Method Hello::__toString() must return a string value in /in/dd7hD:12 Stack trace: #0 {main} thrown in /in/dd7hD on line 12
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
First Recoverable fatal error: Method Hello::__toString() must return a string value in /in/dd7hD on line 12
Process exited with code 255.
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
First Catchable fatal error: Method Hello::__toString() must return a string value in /in/dd7hD on line 12
Process exited with code 255.
Output for 5.0.2 - 5.0.5, 5.1.0 - 5.1.6
First Second Object id #1
Output for 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/dd7hD on line 11 First PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/dd7hD on line 12 Second Object id #1PHP_EOL
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/dd7hD on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/dd7hD 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/dd7hD on line 4
Process exited with code 255.

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