PHP编写的图片验证码类文件分享

适用于自定义的验证码类！

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  */
  Class Image{

private $img;
public $width = 85;
public $height = 25;
public $code;
public $code_len = 4;
public $code_str = "329832983DSDSKDSLKQWEWQ2lkfDSFSDjfdsfdsjwlkfj93290KFDSKJFDSOIDSLK";
public $bg_color = '#DCDCDC';
public $font_size = 16;
public $font = 'font.ttf';
public $font_color = '#000000';

//创建验证码饿字符创
public function create_code(){
$code = '';
for( $i=0;$i<$this->code_len;$i++ ){
$code .= $this->code_str[mt_rand(0,strlen($this->code_str)-1)];
}
return $this->code = $code;
}

//输出图像
public function getImage(){
$w = $this->width;
$h = $this->height;
$bg_color = $this->bg_color;
$img = imagecreatetruecolor($w,$h);
$bg_color = imagecolorallocate($img,hexdec(substr($bg_color,1,2)),3,5,2)));
imagefill($img,$bg_color);
$this->img = $img;
$this->create_font();
$this->create_pix();
$this->show_code();
}

//写入验证码
public function create_font(){
$this->create_code();
$color = $this->font_color;
$font_color = imagecolorallocate($this->img,hexdec(substr($color,2)));
$x = $this->width/$this->code_len;
for( $i=0;$i<$this->code_len;$i++ ){
$txt_color = imagecolorallocate($this->img,mt_rand(0,100),150),200));
imagettftext($this->img,$this->font_size,mt_rand(-30,30),$x*$i+mt_rand(3,6),mt_rand($this->height/1.2,$this->height),$txt_color,$this->font,$this->code[$i]);
//imagestring($this->img,$this->height/4),$this->code[$i],$font_color);
}
$this->font_color = $font_color;
}

//画干扰线
public function create_pix(){
$pix_color= $this->font_color;
for($i=0;$i<100;$i++){
imagesetpixel($this->img,$this->width),$pix_color);
}
for($j=0;$j<4;$j++){
imagesetthickness($this->img,mt_rand(1,2));
imageline($this->img,$pix_color);
}
}

//得到验证码
public function getCode(){
return strtoupper($this->code);
}

//输出验证码
private function show_code(){
header("Content-type:image/png");
imagepng($this->img);
imagedestroy($this->img);
}
}

我们再来看一例代码：

生成图片类型验证码，验证码包含数字和大写字母，session中存放md5加密后的验证码

private $width;//宽度
private $height; //高度
private $codeNum;//验证码字符数量
private $image;//验证码图像资源
private $sessionKey;//session中保存的名字
private $captcha;//验证码字符串
const charWidth = 10;//单个字符宽度,根据输出字符大小而变

/**
 * 创建验证码类，初始化相关参数
 * @param $width 图片宽度
 * @param $height 图片高度
 * @param $codeNum 验证码字符数量
 * @param $sessionKey session中保存的名字
 */
function __construct($width = 50,$height = 20,$codeNum = 4,$sessionKey = 'captcha') {
    $this->width = $width;
    $this->height = $height;
    $this->codeNum = $codeNum;
    $this->sessionKey = $sessionKey;

    //保证最小高度和宽度
    if($height < 20) {
        $this->height = 20;
    }
    if($width < ($codeNum * self::charWidth + 10)) {//左右各保留5像素空隙
        $this->width = $codeNum * self::charWidth + 10;
    }
}

/**
 * 构造并输出验证码图片
 */
public function buildAndExportImage() {
    $this->createImage();
    $this->setDisturb();
    $this->setCaptcha();
    $this->exportImage();
}

/**
 * 构造图像，设置底色
 */
private function createImage() {
    //创建图像
    $this->image = imagecreatetruecolor($this->width,$this->height); 
    //创建背景色
    $bg = imagecolorallocate($this->image,mt_rand(220,255),255)); 
    //填充背景色
    imagefilledrectangle($this->image,$this->width - 1,$this->height - 1,$bg);
}

/**
 * 设置干扰元素
 */
private function setDisturb() {

    //设置干扰点
    for($i = 0; $i < 150; $i++) {
        $color = imagecolorallocate($this->image,mt_rand(150,200),200));
        imagesetpixel($this->image,mt_rand(5,$this->width - 10),$this->height - 3),$color);
    }

    //设置干扰线
    for($i = 0; $i < 10; $i++) {
        $color = imagecolorallocate($this->image,220),220));
        imagearc($this->image,mt_rand(-10,mt_rand(30,300),mt_rand(20,55,44,$color);
    }

    //创建边框色
    $border = imagecolorallocate($this->image,50),50));
    //画边框
    imagerectangle($this->image,$border);
}

/**
 * 产生并绘制验证码
 */
private function setCaptcha() {
    $str = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
    //生成验证码字符
    for($i = 0; $i < $this->codeNum; $i++) {
        $this->captcha .= $str{mt_rand(0,strlen($str) - 1)};
    }
    //绘制验证码
    for($i = 0; $i < strlen($this->captcha); $i++) {
        $color = imagecolorallocate($this->image,200));
        $x = floor(($this->width - 10)/$this->codeNum);
        $x = $x*$i + floor(($x-self::charWidth)/2) + 5;
        $y = mt_rand(2,$this->height - 20);
        imagechar($this->image,$x,$y,$this->captcha{$i},$color);
    }
}

/*
 * 输出图像,验证码保存到session中
 */
private function exportImage() {
    if(imagetypes() & IMG_GIF){
        header('Content-type:image/gif');
        imagegif($this->image);
    } else if(imagetypes() & IMG_PNG){
        header('Content-type:image/png'); 
    imagepng($this->iamge);
    } else if(imagetypes() & IMG_JPEG) {
        header('Content-type:image/jpeg'); 
    imagepng($this->iamge);
    } else {
        imagedestroy($this->image);
        die("Don't support image type!");
    }
    //将验证码信息保存到session中，md5加密
    if(!isset($_SESSION)){
    session_start();
    } 
    $_SESSION[$this->sessionKey] = md5($this->captcha);

imagedestroy($this->image); 
}

function __destruct() {
    unset($this->width,$this->height,$this->codeNum,$this->captcha);
}

}

例三：

if($number > 240-$codeNum){
$this->disturbColorNum= 240-$codeNum;
}else{
$this->disturbColorNum=$number;
}

}
//通过访问该方法向浏览器中输出图像
function showImage($fontFace=""){
//第一步：创建图像背景
$this->createImage();
//第二步：设置干扰元素
$this->setDisturbColor();
//第三步：向图像中随机画出文本
$this->outputText($fontFace);
//第四步：输出图像
$this->outputImage();
}

//通过调用该方法获取随机创建的验证码字符串
function getCheckCode(){
return $this->checkCode;
}
private function createImage(){
//创建图像资源
$this->image=imagecreatetruecolor($this->width,$this->height);
//随机背景色
$backColor=imagecolorallocate($this->image,rand(225,255));
//为背景添充颜色
imagefill($this->image,$backColor);
//设置边框颜色
$border=imagecolorallocate($this->image,0);
//画出矩形边框
imagerectangle($this->image,$this->width-1,$this->height-1,$border);
}
private function setDisturbColor(){
for($i=0; $i<$this->disturbColorNum; $i++){
$color=imagecolorallocate($this->image,rand(0,255));
imagesetpixel($this->image,rand(1,$this->width-2),$this->height-2),$color);
}
for($i=0; $i<10; $i++){
$color=imagecolorallocate($this->image,rand(200,255));
imagearc($this->image,rand(-10,rand(30,rand(20,$color);
}
}
private function createCheckCode(){

//这里主要产生随机码，从2开始是为了区分1和l
$code="23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
$string='';
for($i=0; $i < $this->codeNum; $i++){
$char=$code{rand(0,strlen($code)-1)};
$string.=$char;
}
return $string;
}
private function outputText($fontFace=""){
for($i=0; $i<$this->codeNum; $i++){
$fontcolor=imagecolorallocate($this->image,128),128));
if($fontFace==""){
$fontsize=rand(3,5);
$x=floor($this->width/$this->codeNum)$i+3;
$y=rand(0,$this->height-15);
imagechar($this->image,$fontsize,$this->checkCode{$i},$fontcolor);
}else{
$fontsize=rand(12,16);
$x=floor(($this->width-8)/$this->codeNum)$i+8;
$y=rand($fontSize+5,$this->height);
imagettftext($this->image,rand(-30,$fontcolor,$fontFace,$this->checkCode{$i});
}
}
}
private function outputImage() {
if(imagetypes() & IMG_GIF){
header("Content-Type:image/gif");
imagepng($this->image);
}else if(imagetypes() & IMG_JPG){
header("Content-Type:image/jpeg");
imagepng($this->image);
}else if(imagetypes() & IMG_PNG){
header("Content-Type:image/png");
imagepng($this->image);
}else if(imagetypes() & IMG_WBMP){
header("Content-Type:image/vnd.wap.wbmp");
imagepng($this->image);
}else{
die("PHP不支持图像创建");
}
}
function __destruct(){
imagedestroy($this->image);
}
}

使用如下：

（编辑：安卓应用网）

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