What is the significance of returning true or false in the __isset() method?

When implementing the __isset() magic method in PHP, it is significant to return true if the property being checked for existence is set, and false if it is not set. This method is used to determine if a specific property of an object exists or not. Returning true indicates that the property exists, while returning false indicates that the property does not exist. 

class MyClass {
    private $data = array();

    public function __isset($name) {
        return isset($this->data[$name]);
    }
}

$obj = new MyClass();
$obj->data['example'] = 'value';

var_dump(isset($obj->example)); // Output: bool(true)
var_dump(isset($obj->non_existent)); // Output: bool(false)

Keywords

__isset() significance true false method

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