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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 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.13
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.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
helloWorld helloWorld Fatal error: Uncaught TypeError: Argument 1 passed to StringEater::eat() must be of the type string, object given, called in /in/lIB2j on line 27 and defined in /in/lIB2j:15 Stack trace: #0 /in/lIB2j(27): StringEater->eat(Object(StringableClass)) #1 {main} thrown in /in/lIB2j on line 15
Process exited with code 255.
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