php教程之魔术方法的使用示例教程之魔术方法的使用示例(php魔术函数魔术函数)
复制代码 代码如下:
/** PHP把所有以__（两个下划线）开头的类方法当成魔术方法。所以你定义自己的类方法时，不要以 __为前缀。 * */
// __toString、__set、__get__isset()、__unset()
/*
The __toString method allows a class to decide how it will react when it is converted to a string.
__set() is run when writing data to inaccessible members.
__get() is utilized for reading data from inaccessible members.
__isset() is triggered by calling isset() or empty() on inaccessible members.
__unset() is invoked when unset() is used on inaccessible members.
*/
class TestClass {
private $data = array();
public $foo;
public function __construct($foo) {
$this->foo = $foo;
}
public function __toString() {
return $this->foo;
}
public function __set($name, $value) {
echo “__set, Setting ‘$name’ to ‘$value’”;
$this->data[$name] = $value;
}
public function __get($name) {
echo “__get, Getting ‘$name’”;
if (array_key_exists($name, $this->data)) {
return $this->data[$name];
}
}
/** As of PHP 5.1.0 */
public function __isset($name) {
echo “__isset, Is ‘$name’ set?”;
return isset($this->data[$name]);
}
/** As of PHP 5.1.0 */
public function __unset($name) {
echo “__unset, Unsetting ‘$name’”;
unset($this->data[$name]);
}
}
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