Usage examples of __set and _get in PHP classes

<?php

class example {
	
	private $a;
	
	public function __set($a, $str) {
		//对输入进行验证。
		if (strlen($str) > 0) {
			return $this->$a = $str;
		} else {
                        //如果不能通过验证则抛出错误
                        throw new Exception( '字符串不能为空。');
		}		
	}
	
	public function __get($a) {
		return 'The words you entered: ' . $this->$a;
	}	
}

$c = new example();

$c->a = 'Hello World!'; //此处将调用默认自动调用 __set()函数
echo $c->a; //<pre name="code" class="php">此处将调用默认自动调用 __get()函数

The above introduces the usage examples of __set and _get in PHP classes, including related content. I hope it will be helpful to friends who are interested in PHP tutorials.