php 图形验证码类
php 图形验证码类
<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;" />
复制代码字体文件见附件！
<?php
session_start();
$vi = new vCodeImage;
$vi->SetImage(1,4,65,20,80,1);
class vCodeImage{
/*******************************************************
**FILENAME: verify_image.php
**COPYRIGHT: NONE! (但请保留此信息)
**AUTHOR: vsFree.Com
**DATE: 2007-08-08
********************************************************/
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"){
$ychar = "0,1,2,3,4,5,6,7,8,9";
}
else if($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);
}
}
补充：Php教程,Php安全
