The method of PHP reference operation and local static variables of external operation function

Static variables inside an external action function or member method by reference

Here's a simple example that illustrates three questions about references:

1. Parameter reference after the function of the type conversion is also the address operation

2. The reference character needs to be added again when the parameter reference is passed to another function to keep the address operation

3. Function return value reference must add a reference operator when the function is declared and when called

This example uses the action of an object method, and also applies to a function

 
 Test2 ($a);
		$i + +;
		Var_dump ($a);
		Var_dump ($i);
		return $i;
	}

	protected function Test2 (& $a) {
		$a [' name '] = ' snail ';
	}
}

$obj = new A ();
$a = ';
$c = & $obj->test1 ($a);
$c + +;
Var_dump ($a);
$obj->test1 ($a);
Var_dump ($a);

Results of output