length='3'; // 图片宽(px) $this->imageW || $this->imageW = $this->length*$this->fontSize*1.5 + $this->length*$this->fontSize/2; // 图片高(px) $this->imageH || $this->imageH = $this->fontSize * 2.5; // 建立一幅 $this->imageW x $this->imageH 的图像 $this->_image = imagecreate($this->imageW,$this->imageH); // 设置背景 imagecolorallocate($this->_image,$this->bg[0],$this->bg[1],$this->bg[2]);

// 验证码字体<a href="https://www.jb51.cc/tag/suiji/" target="_blank" class="keywords">随机</a>颜色
$this->_color = imagecolorallocate($this->_image,mt_rand(1,150),150));
// 验证码使用<a href="https://www.jb51.cc/tag/suiji/" target="_blank" class="keywords">随机</a>字体
$ttfPath = dirname(__FILE__) . '/Verify/' . ($this->useZh ? 'zhttfs' : 'ttfs') . '/';

if(empty($this->fontttf)){
  $dir = dir($ttfPath);
  $ttfs = array();    
  while (false !== ($file = $dir->read())) {
    if($file[0] != '.' && substr($file,-4) == '.ttf') {
      $ttfs[] = $file;
    }
  }
  $dir->close();
  $this->fontttf = $ttfs[array_rand($ttfs)];
} 
$this->fontttf = $ttfPath . $this->fontttf;

if($this->useImgBg) {
  $this->_background();
}

if ($this->useNoise) {
  // 绘杂点
  $this->_writeNoise();
}
if ($this->useCurve) {
  // 绘干扰线
  $this->_writeCurve();
}

// 绘验证码
$code = array(); // 验证码
$symbol=array('+','-');
$codeNX = 0; // 验证码第N个字符的左边距
$now_symbol=$symbol[rand(0,1)];
for ($i = 0; $i<$this->length; $i++) {
  if($i==1){
    $code[$i] = $now_symbol;
    $codeNX += mt_rand($this->fontSize*1.2,$this->fontSize*1.6);
    imagettftext($this->_image,$this->fontSize,$codeNX,$this->fontSize*1.6,$this->_color,$ttfPath.'2.ttf',$code[$i]);
  }
  else{
    $code[$i] = $this->codeSet[mt_rand(0,strlen($this->codeSet)-1)];
    $codeNX += mt_rand($this->fontSize*1.2,mt_rand(-40,40),$this->fontttf,$code[$i]);
  } 
}

// 保存验证码
$key    =  $this->authcode($this->seKey);
$str=implode('',$code);
eval("\$re=$str;");
$code    =  $this->authcode($re);
$secode   =  array();
$secode['verify_code'] = $code; // 把校验码保存到session
$secode['verify_time'] = NOW_TIME; // 验证码创建时间
session($key.$id,$secode);

header('Cache-Control: private,max-age=0,no-store,no-cache,must-revalidate');
header('Cache-Control: post-check=0,pre-check=0',false);    
header('Pragma: no-cache');
header("content-type: image/png");

// <a href="https://www.jb51.cc/tag/shuchu/" target="_blank" class="keywords">输出</a>图像
imagepng($this->_image);
imagedestroy($this->_image);

}

authcode($this->seKey).$id; // 验证码不能为空 $secode = session($key); if($code===false || empty($secode)) { return false; } //验证码是否是数字 if(!is_numeric($code)) { return false; } // session 过期 if(NOW_TIME - $secode['verify_time'] > $this->expire) { session($key,null); return false; } if($this->authcode($code) == $secode['verify_code']) { $this->reset && session($key,null); return true; } return false; }

useNoise = true; $Verify->codeSet = '0123456789'; $Verify->useCurve = false; $Verify->entry_add(); }

error('验证码错误！'); return; }

check_add($code,$id); } else{ return $verify->check($code,$id); } }