How can PHP developers control the values that are assigned to variables using __set() in classes?

PHP developers can control the values assigned to variables in classes using the magic method __set(). By implementing this method in a class, developers can intercept attempts to assign values to properties and apply custom logic to validate or modify the values before they are actually assigned. This allows for greater control over the data being stored in class properties. 

class MyClass {
    private $data = [];

    public function __set($name, $value) {
        // Custom logic to control values assigned to variables
        if ($name === 'example' && $value < 10) {
            $this->data[$name] = $value;
        } else {
            echo "Value for property '$name' must be less than 10.";
        }
    }
}

$obj = new MyClass();
$obj->example = 5; // This will assign the value 5 to the 'example' property
$obj->example = 15; // This will output an error message

Keywords

PHP __set() classes variables control

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