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PHP摘引的理解

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2016-06-13 11:01:421055browse

PHP引用的理解

在PHP中,函数的参数传递默认是值传递,我们可以改成引用传递,只要在定义函数时,在参数前面加一个&就可以,如

    $a = "测试";        function setName(& $name){            $name = "测试OK";       }       setName($a);       echo $a;  //输出 测试OK

?以上只是最普通的参数引用传递,还有一种就是返回值为一个引用,看以下例子

class Test{public $a = array(1,2,3,4);	        function &getA()    {        return $this->a;    }}$a = new Test();$b = &$a->getA();	$b[0] = 101;print_r($a->getA());?

输出内容是: Array ( [0] => 101 [1] => 2 [2] => 3 [3] => 4 )

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