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<?php declare(strict_types=1); class StringableClass { public function __toString() { return 'helloWorld'; } } class StringEater { public function eat(string $string) { echo $string; } } $string = new StringableClass(); (new StringEater())->eat((string)$string); echo "\n\n"; printf($string); echo "\n\n"; (new StringEater())->eat($string);
Output for git.master, git.master_jit, rfc.property-hooks
helloWorld Fatal error: Uncaught TypeError: printf(): Argument #1 ($format) must be of type string, StringableClass given in /in/lIB2j:25 Stack trace: #0 /in/lIB2j(25): printf(Object(StringableClass)) #1 {main} thrown in /in/lIB2j on line 25
Process exited with code 255.

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