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<?php interface Printable { public function __toString(); } class MyPrintableClass implements Printable { public $myNumericProperty; public function __construct() { $this->myNumericProperty = 10; } public function __toString() { return 'My numeric property is ' . $this->myNumericProperty; } } function printSomething(Printable $aString) { echo $aString; } printSomething(new MyPrintableClass()); printSomething("aString");
Output for git.master, git.master_jit, rfc.property-hooks
My numeric property is 10 Fatal error: Uncaught TypeError: printSomething(): Argument #1 ($aString) must be of type Printable, string given, called in /in/rTKng on line 24 and defined in /in/rTKng:19 Stack trace: #0 /in/rTKng(24): printSomething('aString') #1 {main} thrown in /in/rTKng on line 19
Process exited with code 255.

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