get()
读取不可访问属性(protected、private)时，__get()会被调用，并将属性名以第一个参数(string)传进此方法中
public mixed __get ( string $name )
<?php
class demo{
protected $protected = 1;
public $public = 2;
private $private = 3;
function __get($name){
echo "111{$name}111<br>";
}
}
$d1 = new demo;
$d1->protected;//111protected111
$d1->public;
$d1->private;//111private111
?>
set()
在给不可访问属性(protected、private)赋值时，__set() 会被调用，并将属性名以第一个参数(string)，值作为第二参数(mixed)传进此方法中
public void __set ( string $name , mixed $value )
<?php
class demo{
protected $protected = 1;
public $public = 2;
private $private = 3;
function __set($name,$value){
echo "0{$name}0{$value}<br>";
}
}
$d1 = new demo;
$d1->protected = '1';//0protected01
$d1->public = '2';
$d1->private = '3';//0private03
?>
isset()
当对不可访问属性(protected、private)调用 isset() 或 empty() 时，__isset() 会被调用
public bool __isset ( string $name )
<?php
class demo{
protected $protected = 1;
public $public = 2;
private $private = 3;
function __isset($name){
echo "0{$name}0<br>";
}
}
$d1 = new demo;
empty($d1->protected);//0protected0
empty($d1->public);
empty($d1->private);//0private0
?>
unset()
当对不可访问属性(protected、private)调用unset()时，__unset()会被调用
public void __unset ( string $name )
<?php
class demo{
protected $protected = 1;
public $public = 2;
private $private = 3;
function __unset($name){
echo "0{$name}0<br>";
}
}
$d1 = new demo;
unset($d1->protected);//0protected0
unset($d1->public);
unset($d1->private);//0private0
?>
原文链接：https://www.qiquanji.com/post/7989.html
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