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<?php declare(strict_types = 1); class strcls implements Stringable { public function __toString() { return '{"a": 1}'; } } var_dump(json_decode(new strcls(), true));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Fatal error: Uncaught TypeError: json_decode(): Argument #1 ($json) must be of type string, strcls given in /in/uEhbM:10 Stack trace: #0 /in/uEhbM(10): json_decode(Object(strcls), true) #1 {main} thrown in /in/uEhbM on line 10
Process exited with code 255.

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