php验证码生成器

$iC=newidCode(5,60,30);

$iC->createPNG();

classidCode{

  private$words=array('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','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',

  Ɔ',Ƈ',ƈ',Ɖ',Ɗ',Ƌ',ƌ',ƍ',Ǝ',Ə');

  private$fonts;

  private$count;//验证码字符数

  private$height;

  private$width;

  private$path='..myfolderfonts'

  private$keys;

  //构造函数

  publicfunction__construct($count,$width,$height){

    $this->count=$count;

    $this->getFonts();

    $this->height =$height;

    $this->width =$width;

  }

  privatefunctiongetFonts(){

    $dir= dir($this->path);

    while(false !== ($file=$dir->read())){

        if($file!='.'&&$file!='..'){

          $this->fonts[count($this->fonts)] =basename($file);

        }

    }

    $dir->close();

  }

  privatefunctioncreateKeys(){

    for($i= 0;$i<$this->count;$i++){

      $this->keys[$i]['char'] =$this->words[rand(0,count($this->words)-1)];

      //使用字体路径标识

      $this->keys[$i]['filename'] =$this->path.'\'.$this->fonts[rand(0,count($this->fonts)-1)];

    }

  }

  publicfunctioncreatePNG(){

    $this->createKeys();

    //创建画布以及颜色块儿

    $bg= imagecreatetruecolor($this->width + 10*2,$this->height + 3*2);//两边留10px空白,上下3px

    $grey= imagecolorallocate($bg,155,155,155);

    $blue= imagecolorallocate($bg,0x00,0x00,0xff);

    //填充背景

    imagefill($bg,0,0,$grey);

    //添加字符

    $pwidth=$this->width/$this->count;

    $x;$y;

    for($i= 0;$i<$this->count;$i++){

      $rotation= rand(-40,40);//偏转角度±40°

      $fontsize= 33;

      $width_txt;

      $height_txt;

      do{

        $fontsize--;

        $bbox= imagettfbbox($fontsize,$rotation,$this->keys[$i]['filename'],$this->keys[$i]['char']);

        $width_txt=$bbox[2] -$bbox[0];//x 0 2 4 6,y1 3 5 7;左下，右下，右上，左上

        $height_txt=$bbox[7] -$bbox[1];

      }while($fontsize> 8 && ($height_txt>$this->height ||$width_txt>$pwidth));

      $fontcolor= imagecolorallocate($bg,rand(0,255),rand(0,255),rand(0,255));

      $x= 8 +$pwidth*$i+$pwidth/2 -$width_txt/2;//x坐标基本位置

      $y=$this->height/2 -$height_txt/2;

      imagettftext($bg,$fontsize,$rotation,$x,$y,$fontcolor,$this->keys[$i]['filename'],$this->keys[$i]['char']);

    }

    //绘制干扰线

    //根据字体酌情增加干扰线

    imageline($bg,0,15,40,10,$blue);

    //图像输出头文件

    header('Content-type:image/png');

    //输出png图像

    imagepng($bg);

    //清除缓存资源

    imagedestroy($bg);

  }

  publicfunctioncheckKeys($input){

    if(count($input)!=$this->count){

      return'ERROR:长度不正确.'

    }else{

      for($i=0;$i<$this->count;$i++){

        //0 o O I l 1 校准,根据所选择的字体确定是否需要手动校准

        if($input[$i] !=$this->keys[$i]['char']){

          return'SUCCESS.'

        }else{

          return'ERROR:请输入正确验证码.'

        }

      }

    }

  }

}

?>