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<?php class SerialDateTime extends DateTime implements JsonSerializable{ public function jsonSerialize(){ return $this->getTimestamp(); } } class StringDateTime extends DateTime{ public function __toString(){ return ''+$this->getTimestamp(); } } $j = new SerialDateTime; $s = new StringDateTime; //echo $j."\n"; echo $s."\n"; echo json_encode(array($j, $s));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of SerialDateTime::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Ba0rr on line 5 Fatal error: Uncaught TypeError: Unsupported operand types: string + int in /in/Ba0rr:13 Stack trace: #0 /in/Ba0rr(21): StringDateTime->__toString() #1 {main} thrown in /in/Ba0rr on line 13
Process exited with code 255.

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