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PHP图形验证码程序

程序员文章站 2022-04-15 07:52:36
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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;


  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();