php验证码生成器

<?php$iC = new idCode(5,60,30);$iC->createPNG();class idCode{  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',  '0','1','2','3','4','5','6','7','8','9');  private $fonts;  private $count;//验证码字符数  private $height;  private $width;  private $path = '../myfolder/fonts';  private $keys;  //构造函数  public function __construct($count,$width,$height){    $this->count = $count;    $this->getFonts();    $this->height = $height;    $this->width = $width;  }  private function getFonts(){    $dir = dir($this->path);    while(false !== ($file = $dir->read())){        if($file != '.' && $file != '..'){          $this->fonts[count($this->fonts)] = basename($file);        }    }    $dir->close();  }  private function createKeys(){    for($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)];    }  }  public function createPNG(){    $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($bg);  }  public function checkKeys($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.';        }      }    }  }}?>