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<?php class StringCastable { private $data; public function __constructor(string $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)); } $speculoos = new StringCastable("speculoos"); var_dump($speculoos, (string)$speculoos); testStringCast($speculoos);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: StringCastable::toString(): Return value must be of type string, null returned in /in/kWZOf:19 Stack trace: #0 /in/kWZOf(14): StringCastable->toString() #1 /in/kWZOf(30): StringCastable->__toString() #2 {main} thrown in /in/kWZOf on line 19
Process exited with code 255.

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