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
<?php
/**
*
* @author Administrator
*
*/
class ValidateCode{
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),rand(225,255),rand(225,255));
//填充颜色
imagefill($this->img_resouce, 0, 0, $backcolor);
//设置边框背景
$border=imagecolorallocate($this->img_resouce, 0,0,0);
//画一个矩形
imagerectangle($this->img_resouce,0,0,$this->width-1,$this->height-1,$border);
}
private function setDistructcolor(){
//绘画干扰点
for ($i = 0; $i <$this->disturbColorNum; $i++) {
imagesetpixel($this->img_resouce, rand(1, $this->width-2), rand(1, $this->height-2), rand(0,255));
}
//绘画干扰线
for ($j = 0; $j <3; $j++) {
$linecolor=imagecolorallocate($this->img_resouce,rand(0,255),rand(0,255),rand(0,255));
imagearc($this->img_resouce, rand(0,$this->width), rand(0,$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, rand(0,128), rand(0, 128), rand(0, 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,$fontsize,rand(-45,45),$x,$y,$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($this->img_resouce);
}else {
echo "PHP不支持的类型";
}
}
private function __destruct(){
imagedestroy($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。