非常实用的php验证码类

本文实例为大家分享了PHP验证码类，供大家参考，具体内容如下

rush:PHP;"> private $width;
private $height;
private $codeNum;
private $img_resouce;
private $disturbColorNum;
private $checkCode;

function __construct($width=80,$height=20,$codeNum=4) {
$this->width=$width;
$this->height=$height;
$this->codeNum=$codeNum;
$this->checkCode=$this->CreateCheckCode();
$number=floor($width*$height/25);
if ($number>240-$codeNum) {
$this->disturbColorNum=240-$codeNum;
}else{
$this->disturbColorNum=$number;
}
}

public function showImage($fontpath='') {
//创建图像背景
$this->Img_resouce();
//var_dump($img_resouce);
//设置干扰元素
$this->setdistructcolor();
//向图像中随机画出文本
$this->outputtext($fontpath);
//输出图像
$this->outputimage();
}
/**

• 获取随机创建的验证码
  /
  public function getCheckCode(){

}
private function Img_resouce(){
//创建一个真彩图像
$this->img_resouce=imagecreatetruecolor($this->width,$this->height);
//随机设置图像背景
$backcolor=imagecolorallocate($this->img_resouce,rand(225,255),255));
//填充颜色
imagefill($this->img_resouce,$backcolor);
//设置边框背景
$border=imagecolorallocate($this->img_resouce,0);
//画一个矩形
imagerectangle($this->img_resouce,$this->width-1,$this->height-1,$border);
}
private function setdistructcolor(){
//绘画干扰点
for ($i = 0; $i <$this->disturbColorNum; $i++) {

  <a href="https://www.jb51.cc/tag/imageset/" target="_blank" class="keywords">imageset</a>pixel($this->img_resouce,rand(1,$this->width-2),$this->height-2),rand(0,255)); 
} 

//绘画干扰线 
for ($j = 0; $j <3; $j++) { 
  $linecolor=imagecolorallocate($this->img_resouce,255)); 
  imagearc($this->img_resouce,$this->width),$this->height),rand(10,225),rand(20,150),55,44,$linecolor); 
} 

}
private function CreateCheckCode(){
$code='23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ';
$string='';
for ($i = 0; $i < $this->codeNum; $i++) {

  $char=$code{rand(0,strlen($code)-1)}; 
  $string.=$char; 
} 
return $string; 

}
private function outputtext($fontpath=''){
for ($i = 0; $i < $this->codeNum; $i++) {
$fontcolor=imagecolorallocate($this->img_resouce,128),128));
if ($fontpath=='') {

     $fontsize=rand(3,5); 
     $x=floor($this->width/$this->codeNum)*$i+3; 
     $y=rand(0,$this->height-20); 
     imagechar($this->img_resouce,$fontsize,$x,$y,$this->checkCode{$i},$fontcolor); 
}else{ 
     $fontsize=rand(12,16); 
     $x=floor(($this->width-8)/$this->codeNum)*$i+8; 
     $y=rand($fontsize,$this->height-15); 
     imagettftext($this->img_resouce,rand(-45,45),$fontcolor,fontpath,$this->checkCode{$i}); 
   } 
} 

}
private function outputimage() {

if (imagetypes() & IMG_GIF) { 
  header("Content-type: image/gif"); 
  imagegif($this->img_resouce); 
}else if(imagetypes() & IMG_JPEG) { 
  header("Content-type: image/jpeg"); 
  imagejpeg($this->img_resouce); 
}else if(imagetypes() & IMG_PNG) { 
  header("Content-type: image/png"); 
  imagepng($this->img_resouce); 
}else { 
  echo "<a href="https://www.jb51.cc/tag/PHP/" target="_blank" class="keywords">PHP</a><a href="https://www.jb51.cc/tag/buzhichi/" target="_blank" class="keywords">不支持</a>的类型"; 
} 

}
private function __destruct(){

imagedestroy($this->img_resouce); 

}
}
?>

以上就是本文的全部内容，希望对大家的学习有所帮助。