PHP动态随机生成验证码类代码_PHP

下面是效果图，这个效果图是没有开启干扰码的效果图

下面是类代码

代码如下:

<br><!--?php <BR-->/************************************************ <br>//FILE:ImageCode <br>//DONE:生成动态验证码类 <br>//DATE"2010-3-31 <br>//Author:www.5dkx.com 5D开心博客 <br>************************************************************************/ <br>class ImageCode{ <br>private $width; //验证码图片宽度 <br>private $height; //验证码图片高度 <br>private $codeNum; //验证码字符个数 <br>private $checkCode; //验证码字符 <br>private $image; //验证码画布 <br>/************************************************************************ <br>// Function:构造函数 <br>// Done:成员属性初始化 <br>// Author:www.5dkx.com 5D开心博客 <br>************************************************************************/ <br>function __construct($width=60,$height=20,$codeNum=4) <br>{ <br>$this->width = $width; <br>$this->height = $height; <br>$this->codeNum = $codeNum; <br>$this->checkCode = $this->createCheckCode(); <br>} <br>function showImage() <br>{ <br>$this->getcreateImage(); <br>$this->outputText(); <br>$this->setDisturbColor(); <br>$this->outputImage(); <br>} <br>function getCheckCode() <br>{ <br>return $this->chekCode; <br>} <br>private function getCreateImage() <br>{ <br>$this->image = imagecreatetruecolor($this->width,$this->height); <br>$back = imagecolorallocate($this->image,255,255,255); <br>$border = imagecolorallocate($this->image,255,255,255); <br>imagefilledrectangle($this->image,0,0,$this->width-1,$this->height-1,$border); <br>//使用纯白色填充矩形框，这里用的话后面干扰码失效 <br>/*如果想用干扰码的话使用下面的*/ <br>//imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$border); <br>} <br>private function createCheckCode() <br>{ <br>for($i=0;$i<$this->codeNum;$i++) <br>{ <br>$number = rand(0,2); <br>switch($number) <br>{ <br>case 0: $rand_number = rand(48,57); break;//数字 <br>case 1: $rand_number = rand(65,90);break;//大写字母 <br>case 2: $rand_number = rand(97,122);break;//小写字母 <br>} <br>$asc = sprintf("%c",$rand_number); <br>$asc_number = $asc_number.$asc; <br>} <br>return $asc_number; <br>} <br>private function setDisturbColor()//干扰吗设置 <br>{ <br>for($i=0;$i<=100;$i++) <br>{ <br>//$color = imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255)); <br>$color = imagecolorallocate($this->image,255,255,255); <br>imagesetpixel($this->image,rand(1,$this->width-2),rand(1,$this->height-2),$color); <br>} <br>//$color = imagecolorallocate($this->image,0,0,0); <br>//imagesetpixel($this->image,rand(1,$this->width-2),rand(1,$this->height-2),$color); <br>} <br>private function outputText() <br>{ <br>//随机颜色、随机摆放、随机字符串向图像

输出
for($i=0;$i<=$this->codeNum;$i++)
{
$bg_color = imagecolorallocate($this->image,rand(0,255),rand(0,128),rand(0,255));
$x = floor($this->width/$this->codeNum)*$i+3;
$y = rand(0,$this->height-15);
imagechar($this->image,5,$x,$y,$this->checkCode[$i],$bg_color);
}
}
private function outputImage()
{
if(imagetypes()&IMG_GIF)
{
header("Content_type:image/gif");
imagegif($this->image);
}
elseif(imagetypes()&IMG_JPG)
{
header("Content-type:image/jpeg");
imagejpeg($this->image,"",0.5);
}
elseif(imagetypes()&IMG_PNG)
{
header("Content-type:image/png");
imagejpeg($this->image);
}
elseif(imagetypes()&IMG_WBMP)
{
header("Content-type:image/vnd.wap.wbmp");
imagejpeg($this->image);
}
else
{
die("PHP不支持图像创建");
}
}
function __destruct()
{
imagedestroy($this->image);
}
}
/*显示*/
/*******************************************************************
session_start();
$image = new ImageCode(60,20,4);
$image->showImage();
$_SESSION['ImageCode'] = $image->getCheckCode();
*******************************************************************/
?>