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Home Backend Development PHP Tutorial 魔术方法 - php简单操作数组和对象时候遇到的两个问题,一起请教各位了

魔术方法 - php简单操作数组和对象时候遇到的两个问题,一起请教各位了

Jun 06, 2016 pm 08:30 PM
php magic method

话不多说,看代码

<code><?php $arr1[][][]=5;
$j=str_repeat('[]', 3);
var_dump($j);
$arr2=array();// 然并卵
$arr2.$j=5;
var_dump($arr1);
var_dump($j);
var_dump($arr2);// 想要实现$arr2[][][]=5一样的效果
</code></code>
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我是不是2b,这个为啥不能用.或者怎样实现问题,。。想知道答案。。


然后第二个问题:我是在tp里调用,我想要的很简单,new 一个TbDemo类。

<code> public function __call($action,$paras){
                $class=self::CLASS_PRE.ucfirst($action);
                if($class==='TbDemo'){
                 $obj2=new TbDemo();//这样是可以输出的,我十分确定以及肯定
                 $obj= new $class();//这样类就找不到了。。报错类找不到。
                }
</code>
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关于为什么$obj2会有输出,我写了自动注册。如果对上面第二个问题稍微有其他方面疑问,可以看这个代码。当然和上面的 ————call在一个类文件里

<code>            public function __construct() {
                spl_autoload_register ( array ($this,'loadClass' ) );
            }

            public function loadClass($className){

            require_once(MODULE_PATH.'Controller/'.$className.'.class.php');

           }
</code>
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周末愉快~

回复内容:

话不多说,看代码

<code><?php $arr1[][][]=5;
$j=str_repeat('[]', 3);
var_dump($j);
$arr2=array();// 然并卵
$arr2.$j=5;
var_dump($arr1);
var_dump($j);
var_dump($arr2);// 想要实现$arr2[][][]=5一样的效果
</code></code>
Copy after login
Copy after login

我是不是2b,这个为啥不能用.或者怎样实现问题,。。想知道答案。。


然后第二个问题:我是在tp里调用,我想要的很简单,new 一个TbDemo类。

<code> public function __call($action,$paras){
                $class=self::CLASS_PRE.ucfirst($action);
                if($class==='TbDemo'){
                 $obj2=new TbDemo();//这样是可以输出的,我十分确定以及肯定
                 $obj= new $class();//这样类就找不到了。。报错类找不到。
                }
</code>
Copy after login
Copy after login

关于为什么$obj2会有输出,我写了自动注册。如果对上面第二个问题稍微有其他方面疑问,可以看这个代码。当然和上面的 ————call在一个类文件里

<code>            public function __construct() {
                spl_autoload_register ( array ($this,'loadClass' ) );
            }

            public function loadClass($className){

            require_once(MODULE_PATH.'Controller/'.$className.'.class.php');

           }
</code>
Copy after login
Copy after login

周末愉快~

第一个问题的需求非常奇怪,LZ期望的其实是eval函数的效果,只不过强烈建议不要这么做,操作不当很容易留下漏洞(并且性能也不高)

<code>php</code><code>$code = "\$x[][][]=5;";
eval($code);
print_r($x);
</code>
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提供一个更安全的方案

<code>php</code><code>$x = 5;
$depth = 3; //深度
for ($i = 0; $i </code>
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对于第二个问题,我非常怀疑是大小写文件名的问题,LZ不妨仔细检查一下

第一个问题,你直接var_dump($arr2.$j);就知道了,说明这两个合起来他整体是一个字符串(Array[][][]);
这个字符串直接单独赋值php并不会将其先转成数组...

第二个问题,这样用肯定是可以的...就不知道是tp的问题还是啥问题了...

第二个问题可能是命名空间的问题,用变量的形式去实例化类,无法指定到该类对应的命名空间下

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