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Home Backend Development PHP Tutorial 哪位大侠可以告诉小弟我php中_call()的返回值是什么!

哪位大侠可以告诉小弟我php中_call()的返回值是什么!

Jun 13, 2016 pm 01:44 PM
echo function gt print quot

哪位大侠可以告诉我php中__call()的返回值是什么!~~
class my{
public $name = "我的类";

function __tostring(){
return $this -> name."是个空类"."
";

}
function __call($n, $v){
echo "不存在的方法:".$n."
";
echo "错误的值:",print_r($v)."
"; //最后面输出1,是怎么回事。
}
}

$p = new my();

echo $p;

$p -> no("第一",6,a);



下面是运行结果:我的类是个空类
不存在的方法:no
错误的值:Array ( [0] => 第一 [1] => 6 [2] => a ) 1

为什么最后面会出现个1呢???百思不得其解!~~




------解决方案--------------------
bool print_r ( mixed expression [, bool return] )
print_r的返回值

function __call($n, $v){
echo "不存在的方法:".$n."
";
print_r($v); 
}
------解决方案--------------------
return 参数。若此参数设为 TRUE,print_r() 将不打印结果(此为默认动作),而是返回其输出
所以也可以这样

echo "错误的值:".print_r($v,true)."
"; //最后面输出1,是怎么回事。

------解决方案--------------------
你这个不是__call方法的问题,1是print_r的返回值
function __call($n, $v)
{
echo "不存在的方法:".$n."
";
echo "错误的值:";print_r($v); //最后面输出1,是怎么回事。
}
改成这样就不会输出1了。

你写成echo "错误的值:".print_r($v,true)."
"; 这样就会输出返回值

http://zhidao.baidu.com/question/256918769.html

http://cn2.php.net/print_r/


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