ValidateCode.class.php
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<?php
/**
* 验证码类
* @author staven
*
*/
class ValidateCode{
private $width ; //验证码图片的宽度
private $height ; //验证码图片的高度
private $checkCode ; //验证码字符
private $codeNum ; //验证码字符个数
private $font ; //字体
private $fontSize ; //字体大小
private $fontColor ; //字体颜色
private $image ; //验证码句柄
private $charset ; //验证字符随机因子
//构造器方法初始化
function __construct( $width =100, $height =20, $codeNum =4, $fontSize = 12){
$this ->width = $width ;
$this ->height = $height ;
$this ->codeNum = $codeNum ;
$this ->fontSize = $fontSize ;
$this ->font = dirname( __FILE__ ) . '/font/elephant.ttf' ;
$this ->charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789' ; //提供随机因子
$this ->checkCode = $this ->createCheckCode();
}
/* 用于输出验证码图片，并且将验证码信息写入session */
function __toString(){
/* 加到session中， 存储下标为code */
$_SESSION [ "code" ] = strtoupper ( $this ->checkCode);
$this ->outImage();
return '' ;
}
/* 生成随机验证码字符 */
private function createCheckCode(){
for ( $i =0; $i codeNum; $i ++){
$this ->checkCode .= $this ->charset{rand(0, strlen ( $this ->charset)-1)};
}
return $this ->checkCode;
}
/* 输出验证码 */
private function outImage(){
$this ->getCreateImage();
$this ->createLine();
$this ->outputText();
$this ->outputImage();
}
/* 生成验证码背景图片 */
private function getCreateImage(){
$this ->image = imagecreatetruecolor( $this ->width, $this ->height);
$color = imagecolorallocate( $this ->image, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
imagefilledrectangle( $this ->image,0, $this ->height, $this ->width,0, $color );
}
/* 向句柄图片中写入文字信息 */
private function outputText(){
$_x = $this ->width / $this ->codeNum;
for ( $i =0; $i codeNum; $i ++) {
$this ->fontcolor = imagecolorallocate( $this ->image,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
imagettftext( $this ->image, $this ->fontSize,mt_rand(-30,30), $_x * $i +mt_rand(1,5), $this ->height / 1.4, $this ->fontColor, $this ->font, $this ->checkCode[ $i ]);
}
}
/* 创建雪花图案 */
private function createLine() {
for ( $i =0; $i
$color = imagecolorallocate( $this ->image,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
imageline( $this ->image,mt_rand(0, $this ->width),mt_rand(0, $this ->height),mt_rand(0, $this ->width),mt_rand(0, $this ->height), $color );
}
for ( $i =0; $i
$color = imagecolorallocate( $this ->image,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
imagestring( $this ->image,mt_rand(1,5),mt_rand(0, $this ->width),mt_rand(0, $this ->height), '*' , $color );
}
}
/* 生成验证码图片 */
private function outputImage(){
header( 'Content-type:image/png' );
imagepng( $this ->image);
imagedestroy( $this ->image);
}
/* 销毁句柄，释放资源 */
function __destruct() {
imagedestroy( $this ->image);
}
}
imageCode.php
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<?php
session_start(); //开启SESSION
require_once 'ValidateCode.class.php' ;
echo new ValidateCode();
image.php
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