PHP网站建设开发用的图形验证码源码下载-平面广告设计知识---南宁烟寒网络公司

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.

样式:

class.image.php

/*
===========================================================
    class.image.php    Zhu Weiwei
    Copyright © 2006-2008
    http://www.jzxue.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;

    /*
    * 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 setPixel($x,$y,$color){
        return imagesetpixel($this->img, $x, $y, $color);
    }

/*
===========================================================
    imgverifycode.php    Zhu Weiwei
    Copyright © 2006-2008
    http://www.jzxue.com China. All Rights Reserved.
===========================================================
*/
<?php
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; $i<$w-$p; $i=$i+$s+$p){
    $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; $j<8*$r; $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; $i<200*$r; $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();