PHP中__set 与 __get使用示例

class Person {
    function __get( $property ) {
        $method = "get{$property}";
        if ( method_exists( $this, $method ) ) {
            return $this->$method();
        }
    }
    function __isset( $property ) {
        $method = "get{$property}";
        return ( method_exists( $this, $method ) );
    }
    function getName() {
        return "Bob";
    }

    function getAge() {
        return 44;
    }
}
print "";
$p = new Person();
if ( isset( $p->name ) ) {
    print $p->name;
} else {
    print "nope\n";
}
print "";
// output:
// Bob
?>

演示代码2：

class Person {
    private $_name;
    private $_age;
    function __set( $property, $value ) {
        $method = "set{$property}";
        if ( method_exists( $this, $method ) ) {
            return $this->$method( $value );
        }
    }

    function __unset( $property ) {
        $method = "set{$property}";
        if ( method_exists( $this, $method ) ) {
            $this->$method( null );
        }
    }

    function setName( $name ) {
        $this->_name = $name;
        if ( ! is_null( $name ) ) {
            $this->_name = strtoupper($this->_name);
        }
    }
    function setAge( $age ) {
        $this->_age = $age;
    }
}
print "";
$p = new Person();
$p->name = "bob";
$p->age  = 44;
print_r( $p );
unset($p->name);
print_r( $p );
print "";
?>

输出结果： Person Object ( [_name:Person:private] => BOB [_age:Person:private] => 44 ) Person Object ( [_name:Person:private] => [_age:Person:private] => 44 )