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<?php class StringCastable { private $data; public function __constructor($data) { $this->data = $data; } public function __toString(): string { return $this->toString(); } public function toString(): string { return $this->data; } } function testStringCast(string $data) { var_dump($data, get_class($data)); } testStringCast(new StringCastable("speculoos"));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: StringCastable::toString(): Return value must be of type string, null returned in /in/Nd5AX:19 Stack trace: #0 /in/Nd5AX(14): StringCastable->toString() #1 /in/Nd5AX(23): StringCastable->__toString() #2 /in/Nd5AX(28): testStringCast(Object(StringCastable)) #3 {main} thrown in /in/Nd5AX on line 19
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Return value of StringCastable::toString() must be of the type string, null returned in /in/Nd5AX:19 Stack trace: #0 /in/Nd5AX(14): StringCastable->toString() #1 /in/Nd5AX(23): StringCastable->__toString() #2 /in/Nd5AX(28): testStringCast(Object(StringCastable)) #3 {main} thrown in /in/Nd5AX on line 19
Process exited with code 255.
Output for 7.0.1 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Fatal error: Method StringCastable::__toString() must not throw an exception, caught TypeError: Return value of StringCastable::toString() must be of the type string, null returned in /in/Nd5AX on line 0
Process exited with code 255.
Output for 7.0.0
Fatal error: Method StringCastable::__toString() must not throw an exception in /in/Nd5AX on line 0
Process exited with code 255.
Output for 5.4.8 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.21
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/Nd5AX on line 12
Process exited with code 255.
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