How can references be utilized in PHP classes?

References can be utilized in PHP classes to pass variables by reference, allowing multiple variables to refer to the same value in memory. This can be useful for modifying variables within a class method without needing to return them. To use references in PHP classes, simply pass variables by reference in the method parameters or assign variables by reference within the class. 

class MyClass {
    public $value;

    public function setValue(&$newValue) {
        $this->value = $newValue;
    }
}

$myObject = new MyClass();
$var = 5;
$myObject->setValue($var);
echo $myObject->value; // Outputs: 5

Keywords

references PHP classes pass by reference call by reference memory optimization

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