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<?php class test { public function __toString() { $e = new Exception('mooo'); var_dump($e->getTrace()); // throw $e; return null; } } $x = new test; var_dump((string)$x);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
array(1) { [0]=> array(6) { ["file"]=> string(9) "/in/4Ng9e" ["line"]=> int(17) ["function"]=> string(10) "__toString" ["class"]=> string(4) "test" ["type"]=> string(2) "->" ["args"]=> array(0) { } } } Fatal error: Uncaught TypeError: test::__toString(): Return value must be of type string, null returned in /in/4Ng9e:11 Stack trace: #0 /in/4Ng9e(17): test->__toString() #1 {main} thrown in /in/4Ng9e on line 11
Process exited with code 255.
Output for 7.4.0 - 7.4.33
array(1) { [0]=> array(6) { ["file"]=> string(9) "/in/4Ng9e" ["line"]=> int(17) ["function"]=> string(10) "__toString" ["class"]=> string(4) "test" ["type"]=> string(2) "->" ["args"]=> array(0) { } } } Fatal error: Uncaught Error: Method test::__toString() must return a string value in /in/4Ng9e:17 Stack trace: #0 {main} thrown in /in/4Ng9e on line 17
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
array(1) { [0]=> array(6) { ["file"]=> string(9) "/in/4Ng9e" ["line"]=> int(17) ["function"]=> string(10) "__toString" ["class"]=> string(4) "test" ["type"]=> string(2) "->" ["args"]=> array(0) { } } } Recoverable fatal error: Method test::__toString() must return a string value in /in/4Ng9e on line 17
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, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20
array(1) { [0]=> array(6) { ["file"]=> string(9) "/in/4Ng9e" ["line"]=> int(17) ["function"]=> string(10) "__toString" ["class"]=> string(4) "test" ["type"]=> string(2) "->" ["args"]=> array(0) { } } } Catchable fatal error: Method test::__toString() must return a string value in /in/4Ng9e on line 17
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
string(12) "Object id #1"
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/4Ng9e on line 6
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/4Ng9e on line 6
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/4Ng9e on line 6
Process exited with code 255.

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