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php创建验证码,该怎么处理

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Release： 2016-06-13 13:30:18
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php创建验证码
刚开始看php使用GD2函数创建验证码，里面遇到问题了，最后两句不理解：
$ImageFun='Image'.$type; 

$ImageFun($im);
这两句话是什么意思？$ImageFun是变量吗？为什么我把最后一句话注释掉，就不显示验证码了，难道$ImageFun是个函数？但是我查了PHP手册，好像没有这个函数，期待高手给我解释一下最后这两句话的含义。

------解决方案--------------------
不送白不送.给系统还不如给大家
------解决方案--------------------
LZ不厚道啊，还是散分吧！
------解决方案--------------------
分..

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image nbsp php type
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