把验证码和生成时间负值给$_SESSION[vCode]生成图像给浏览器

php 图片 中文验证码

<img src="verify_image.php" alt="点此刷新验证码" name="verify_code" width="65" height="20" border="0" id="verify_code" ｏｎｃｌｉｃｋ="ｄｏｃｕｍｅｎｔ.ｇｅｔＥｌｅｍｅｎｔＢｙＩｄ('verify_code').src='verify_image.php?'+Ｍａｔｈ.ｒａｎｄｏｍ();" style="cursor:pointer;" />

<?php
session_start();

$vi = new vCodeImage;
$vi->SetImage(1,4,65,20,80,1);

class vCodeImage{
 var $mode;  //1：数字模式，2：字母模式，3：数字字母模式，其他：数字字母优化模式
 var $v_num;  //验证码个数
 var $img_w;  //验证码图像宽度
 var $img_h;  //验证码图像高度
 var $int_pixel_num;  //干扰像素个数
 var $int_line_num;  //干扰线条数
 var $font_dir;   //字体文件相对路径
 var $border;   //图像边框
 var $borderColor;  //图像边框颜色

 function SetImage($made,$v_num,$img_w,$img_h,$int_pixel_num,$int_line_num,$font_dir='../font',$border=true,$borderColor='255,200,85'){
  if(!isset($_SESSION['vCode'])){
   session_register('vCode');
  }
  $_SESSION['vCode']="";
  
  $this->mode = $made;
  $this->v_num = $v_num;
  $this->img_w = $img_w;
  $this->img_h = $img_h;
  $this->int_pixel_num = $int_pixel_num;
  $this->int_line_num = $int_line_num;
  $this->font_dir = $font_dir;
  $this->border = $border;
  $this->borderColor = $borderColor;
  $this->GenerateImage();
 }

 function GetChar($mode){
  if($mode == "1"){2881064151
   $ychar = "0,1,2,3,4,5,6,7,8,9";
  }
  else if($mode == "2"){
   $ychar = "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
  }
  else if($mode == "3"){
   $ychar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
  }
  else
   $ychar = "3,4,5,6,7,8,9,A,B,C,D,H,K,P,R,S,T,W,X,Y";
  return $ychar;
 }
 
 function RandColor($rs,$re,$gs,$ge,$bs,$be){
  $r = mt_rand($rs,$re);
  $g = mt_rand($gs,$ge);
  $b = mt_rand($bs,$be);
  return array($r,$g,$b);
 }
 
 function GenerateImage(){
  $im = imagecreate($this->img_w,$this->img_h);

  $black = imagecolorallocate($im, 0,0,0);
  $white = imagecolorallocate($im, 255,255,255); 
  $bgcolor = imagecolorallocate($im, 250,250,250);

  imagefill($im,0,0,$bgcolor);

  $fonts = ScanDir($this->font_dir);
  $fmax = count($fonts) - 2;

  $ychar = $this->GetChar($this->mode);
  $list = explode(",",$ychar);

  $x = mt_rand(2,$this->img_w/($this->v_num+2));
  $cmax = count($list) - 1;

  $v_code = '';

  for($i=0;$i<$this->v_num;$i++) //验证码
  {
   $randnum = mt_rand(0,$cmax);
   $this_char = $list[$randnum];
   $v_code .= $this_char;
   $size = mt_rand(intval($this->img_w/5),intval($this->img_w/4));
   $angle = mt_rand(-20,20);
   $y = mt_rand(($size+2),($this->img_h-2));
   if($this->border)
    $y = mt_rand(($size+3),($this->img_h-3));
   $rand_color = $this->RandColor(0,200,0,100,0,250);
   $randcolor = imagecolorallocate($im,$rand_color[0],$rand_color[1],$rand_color[2]);
   $fontrand = mt_rand(2, $fmax);
   $font = "$this->font_dir/".$fonts[$fontrand];
   imagettftext($im, $size, $angle, $x, $y, $randcolor, $font, $this_char);
   $x = $x + intval($this->img_w/($this->v_num+1));
  }

  for($i=0;$i<$this->int_pixel_num;$i++){//干扰像素
   $rand_color = $this->RandColor(50,250,0,250,50,250);
   $rand_color_pixel = imagecolorallocate($im,$rand_color[0],$rand_color[1],$rand_color[2]);
   imagesetpixel($im, mt_rand()%$this->img_w, mt_rand()%$this->img_h, $rand_color_pixel);
  }

  for($i=0;$i<$this->int_line_num;$i++){ //干扰线
   $rand_color = $this->RandColor(0,250,0,250,0,250);
   $rand_color_line = imagecolorallocate($im,$rand_color[0],$rand_color[1],$rand_color[2]);
   imageline($im, mt_rand(0,intval($this->img_w/3)), mt_rand(0,$this->img_h), mt_rand(intval($this->img_w - ($this->img_w/3)),$this->img_w), mt_rand(0,$this->img_h), $rand_color_line);
  }

  if($this->border) //画出边框
  {
   if(preg_match("/^d{1,3},d{1,3},d{1,3}$/",$this->borderColor)){
    $borderColor = explode(',',$this->borderColor);
   }
   $border_color_line = imagecolorallocate($im,$borderColor[0],$borderColor[1],$borderColor[2]);
   imageline($im, 0, 0, $this->img_w, 0, $border_color_line); //上横
   imageline($im, 0, 0, 0, $this->img_h, $border_color_line); //左竖
   imageline($im, 0, $this->img_h-1, $this->img_w, $this->img_h-1, $border_color_line); //下横
   imageline($im, $this->img_w-1, 0, $this->img_w-1, $this->img_h, $border_color_line); //右竖
  }

  imageantialias($im,true); //抗锯齿

  $time = time();
  $_SESSION['vCode'] = $v_code."|".$time; //把验证码和生成时间负值给$_SESSION[vCode]

  //生成图像给浏览器
  if (function_exists("imagegif")) {
      header ("Content-type: image/gif");
      imagegif($im);
  }
  elseif (function_exists("imagepng")) {
      header ("Content-type: image/png");
      imagepng($im);
  }
  elseif (function_exists("imagejpeg")) {
      header ("Content-type: image/jpeg");
      imagejpeg($im, "", 80);
  }
  elseif (function_exists("imagewbmp")) {
      header ("Content-type: image/vnd.wap.wbmp");
      imagewbmp($im);
  }
  else
      die("No Image Support On This Server !");
 
  imagedestroy($im);
 }
}
?>