phpstan-src/tests/PHPStan/Rules/Functions/data/bug-757.php at aced59d6b6062b37a707376ad1933f8ee161f99d · phpstan/phpstan-src · GitHub

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<?php

namespace Bug757;

class A {
	/** @var string */
	public $foo = "bar";

	public function &getString() : string {
		return $this->foo;
	}

	public function getStringNoRef() : string {
		return $this->foo;
	}

	public static function &staticGetString() : string {
		static $s = "bar";
		return $s;
	}
}

function &refFunction() : string {
	static $s = "bar";
	return $s;
}

function noRefFunction() : string {
	return "bar";
}

function useString(string &$s) : void {}

function () {
	$a = new A();
	useString($a->getString()); // ok - returns by reference
	useString($a->getStringNoRef()); // error - does not return by reference
	useString(A::staticGetString()); // ok - returns by reference
	useString(refFunction()); // ok - returns by reference
	useString(noRefFunction()); // error - does not return by reference
};