最近经常有人问我这个blog中的图形验证码是如何做的.下面是这个php图形验证码的源程序.
欢迎指正.
class.image.php
/*
===========================================================
class.image.php Zhu Weiwei
Copyright © 2006-2008
http://www.cncmm.com China. All Rights Reserved.
===========================================================
*/
class Image
{
PRivate $img;
private $width;
private $height;
private $color;
private $font;
private $mime="image/jpeg";
/* 1,GIF 2,JPEG 3,PNG */
private $type=2;
private $angle=0;
private $text;
private $textW;
private $textH;
private $size=5;
private $tcolor;
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function __construct($w="100", $h="50"){
$this->width=$w;
$this->height=$h;
}
function create() {
if ($this->type != 1 && function_exists('imagecreatetruecolor')) {
// 本函数不能用于 GIF 文件格式
// 本函数需要 GD 2.0.1 或更高版本。
// 返回一个图像标识符，代表了一幅大小为 x_size 和 y_size 的黑色图像
$this->img=imagecreatetruecolor($this->width,$this->height);
}else {
$this->img=imagecreate($this->width,$this->height);
}
}
/*
* 1=GIF 2=JPG
* 3=PNG
*/
function createFromFile($f){
$imgInfo=getimagesize($f);
$this->type=$imgInfo[2];
switch($this->type){
case 1:
$this->loadGifFile($f);
break;
case 2:
$this->loadJpegFile($f);
break;
case 3:
$this->loadPngFile($f);
break;
default:
die("This Image Type Not Support loadimage !");
exit();
}
}
function loadGifFile($f){
// 1.6 -- 2.0.28
//二者之间版本的 GD 库时本函数不可用
$this->img=imagecreatefromgif($f ) or die("Load Gif picture error!") ;
$this->width=imagesx($this->img);
$this->height=imagesy($this->img);
$this->mime="image/gif";
$this->type=1;
}
function loadJpegFile($f){
//JPEG 支持仅在 PHP 与 GD-1.8 或更高版本一起编译时可用
$this->img=imagecreatefromjpeg($f) or die("Load Jpeg picture error!") ;
$this->width=imagesx($this->img);
$this->height=imagesy($this->img);
$this->mime="image/jpeg";
$this->type=2;
}
function loadPngFile($f){
$this->img=imagecreatefrompng($f ) or die("Load Png picture error!") ;
$this->width=imagesx($this->img);
$this->height=imagesy($this->img);
$this->mime="image/png";
$this->type=3;
}
function setBackgroundColor($r, $g, $b){
## 用color 颜色填充了的矩形
## 其左上角坐标为 x1，y1
## 右下角坐标为 x2，y2
## 0, 0 是图像的最左上角
$color =imagecolorallocate($this->img, $r, $g, $b);
return imagefilledrectangle($this->img, 0, 0, $this->width, $this->height, $color);
}
function setColor($r, $g, $b){
$this->color=imagecolorallocate($this->img, $r, $g, $b);
return (-1 == $this->color) ? (false) : ($this->color);
}
function setTextColor($r, $g, $b){
$this->tcolor=imagecolorallocate($this->img, $r, $g, $b);
return (-1 == $this->tcolor) ? (false) : ($this->tcolor);
}
function setText($t){
$this->text=$t;
}
function waterMark($r, $g, $b, $alpha){
$this->tcolor=imagecolorclosestalpha($this->img, $r, $g, $b, $alpha);
}
function setFontFile($f){
$this->font=$f;
}
function addTrueTypeText($xoffset,$yoffset){
#$x=( ( $this->width - $this->textW - 10) > 0) ? ($this->width - $this->textW - 10) : (0) ;
#$y=( ( $this->height-10) > 0) ? ($this->height-10) : ($this->height);
// 用 TrueType 字体向图像写入文本
// **x，y 坐标是字符串左下角坐标，整幅图像的左上角为 0，0
imagettftext($this->img,
$this->size,
$this->angle,
$xoffset,
$yoffset,
$this->tcolor,
$this->font,
$this->text);
}
function addText() {
// http://www.devdao.com/ 用 color 颜色将字符串 s 画到 image
// **x，y 坐标是字符串左上角坐标，整幅图像的左上角为 0，0
// 如果font 是 1，2，3，4 或 5，则使用内置字体。
imagestring ($this->img, $font, $x, $y, $this->text, $this->tcolor);
}
function setSize($s){
$this->size=$s;
}
function setAngle($a){
$this->angle=$a;
}
function setWidth($w){
$this->width=$w;
}
function setHeight($h){
$this->height=$h;
}
function getWidth(){
return $this->width;
}
function getHeight(){
return $this->height;
}
function setPixel($x,$y,$color){
return imagesetpixel($this->img, $x, $y, $color);
}
function setLine($x1,$y1,$x2,$y2,$color){
return imageline($this->img, $x1, $y1, $x2, $y2, $color);
}
function createImageFile($f="default"){
if( !empty($f) ){
switch($this->type){
case 1:
imagegif($this->img, $f.".gif",80);
break;
case 2:
imagejpeg($this->img, $f.".jpg" , 80);
break;
case 3:
imagepng($this->img, $f.".png", 80);
break;
default:
die("This Image Type Not Support create !");
exit();
}
imagedestroy($this->img);
}
}
function show(){
header("Content-type: ".$this->mime);
switch($this->type){
case 1:
imagegif($this->img);
break;
case 2:
imagejpeg($this->img);
break;
case 3:
imagepng($this->img);
break;
default:
die("This Image Type Not Support show !");
exit();
}
imagedestroy($this->img);
}
/* Zoom Out Picture */
function roomOut($maxW, $maxH){
$WW=(($maxW) and ($this->width > $maxW));
$HH=(($maxH) and ($this->height > $maxH));
if($WW or $HH){
if($WW){
$wRatio =$maxW / $this->width;
$wResize=true;
}
if($HH){
$hRatio =$maxH / $this->height;
$hResize=true;
}
if($wResize and $hResize){
if($wRatio $ratio=$wRatio;
}else{
$ratio=$hRatio;
}
}elseif($wResize){
$ratio=$wRatio;
}elseif($hResize){
$ratio=$hRatio;
}
}else{
$ratio=1;
}
$newWidth=$this->width * $ratio;
$newHeight=$this->height * $ratio;
if(function_exists("imagecopyresampled")){
$newimg=imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($newimg, $this->img, 0, 0, 0, 0, $newWidth, $newHeight, $this->width, $this->height);
}else{
$newimg=imagecreate($newWidth, $newHeight);
imagecopyresized($newimg, $this->img, 0, 0, 0, 0, $newWidth, $newHeight, $this->width, $this->height);
}
$this->img=$newimg;
$this->width= $newWidth;
$this->height=$newHeight;
}
}
imgverifycode.php
/*
===========================================================
imgverifycode.php Zhu Weiwei
Copyright © 2006-2008
http://www.cncmm.com China. All Rights Reserved.
===========================================================
*/
require('class.image.php');
# char number
$n = 4;
#font size
$s = 18;
#font padding
$p = 5;
#font angle -a,a
$a = 15;
#image width
$w = ($s+$p)*$n+$p;
#image height;
$h = intval($s*1.5);
$c = ($h + $s)/2;
$o = abs($h-$s-2*$p)/2;
$r = 1;
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
#$str = '1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyz';
#$str = '0123456789';
$len = strlen($str)-1;
$code = '';
$im = new Image($w,$h);
$im->create();
$im->setBackgroundColor( mt_rand(0xdd,0xff), mt_rand(0xdd,0xff), mt_rand(0xdd,0xff) );
$im->setSize( $s );
for($i=$p; $i $char = $str{mt_rand(0,$len)};
$code = $code.$char;
$im->setFontFile($CFG->dirroot.'/font/'.mt_rand(2,5).'.ttf');
$im->setText( $char );
$im->setAngle( mt_rand(-$a,$a) );
$im->setTextColor(mt_rand(0x0,0x66),mt_rand(0x0,0x66),mt_rand(0x0,0x66) );
$im->addTrueTypeText($i,mt_rand($c-$o,$c+$o));
for($j=0; $j $xs = mt_rand($i-$s/2+$p,$i+$s/2-$p);
$ys = mt_rand($p,$h-$p);
$color = $im->setColor(mt_rand(0x0,0x66),mt_rand(0x0,0x66),mt_rand(0x0,0x66));
$im->setLine( $xs, $ys, $xs+mt_rand(-$s/2,$s/2), $ys+mt_rand(-$s/2,$s/2), $color);
}
}
$SESS = new session();
$SESS->setParameter('verifycode',$code);
for($i=0; $i $color = $im->setColor(mt_rand(0x0,0x66),mt_rand(0x0,0x66),mt_rand(0x0,0x66));
$im->setPixel(mt_rand(0,$w), mt_rand(0,$h),$color);
}
$im->show();
