dede自定义表单加验证码

1.修改diy.php

加引用：require_once(DEDEINC.'/membermodel.cls.php');

2.搜索elseif($do == 2)，在下面大括号中加入

//验证码验证

        $svali = GetCkVdValue();

         if(preg_match("/1/",$safe_gdopen)){

             if(strtolower($vdcode)!=$svali || $svali=='')

             {

echo'<script>alert("验证码错误");history.back();</script>';

                 exit();

             }  }

2.修改模板

<input name="vdcode" required="required" class="bsml-yzm" placeholder="验证码"><font color="#FF0000">&nbsp;*</font>
<img id="vdimgck" align="absmiddle" onclick="this.src=this.src+'?'" style="cursor: pointer; width:64px;" alt="看不清？点击更换" src="/include/vdimgck.php"/>