PHP编写的图片验证码类文件分享

只看该作者 · 发表于 2018-2-14 05:35:23

         适用于自定义的验证码类！
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;
$($w, $h);
$bg_color = imagecolorallocate($img,
  hexdec(substr($bg_color, 1,2)), hexdec(substr($bg_color, 3,2)), hexdec(substr($bg_color, 5,2)));
  imagefill($img, 0, 0, $bg_color);
$this->$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($color,1,2)), hexdec(substr($color, 3,2)), hexdec(substr($color,5,2)));
$x = $this->width/$this->code_len;
for( $i=0;$icode_len;$i++ ){
   $txt_color = imagecolorallocate($this->img, mt_rand(0,100), mt_rand(0, 150), mt_rand(0, 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->font_size, $x*$i+mt_rand(3, 6),mt_rand(0, $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;$iimg, mt_rand(0, $this->width),mt_rand(0, $this->height), $pix_color);
}
for($j=0;$jimg, mt_rand(1, 2));
   imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $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
buildAndExportImage();
*
* 作    者: luojing
* 创建时间: 2013-3-27 上午11:42:12
*/
class Captcha {

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($height height = 20;
}
if($width 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), mt_rand(220, 255), mt_rand(220, 255));
//填充背景色
imagefilledrectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $bg);
}

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

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

//设置干扰线
for($i = 0; $i image, mt_rand(150, 220), mt_rand(150, 220), mt_rand(150, 220));
imagearc($this->image, mt_rand(-10, $this->width), mt_rand(-10, $this->height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $color);
}

//创建边框色
$border = imagecolorallocate($this->image, mt_rand(0, 50), mt_rand(0, 50), mt_rand(0, 50));
//画边框
imagerectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $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 codeNum; $i++) {
$this->captcha .= $str{mt_rand(0, strlen($str) - 1)};
}
//绘制验证码
for($i = 0; $i captcha); $i++) {
$color = imagecolorallocate($this->image, mt_rand(0, 200), mt_rand(0, 200), mt_rand(0, 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, 5, $x, $y, $this->captcha{$i}, $color);
}
}

/*
   * 输出图像,验证码保存到session中
   */
private function exportImage() {
if(imagetypes() & ){
header('Content-type:image/gif');
imagegif($this->image);
} else if(imagetypes() & ){
header('Content-type:image/png');
     imagepng($this->iamge);
} else if(imagetypes() & ) {
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：
width=$width;
  $this->height=$height;
  $this->codeNum=$codeNum;
  $this->checkCode=$this->createCheckCode();
  $number=floor($width*$height/15);

  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), rand(225,255), rand(225, 255));
  //为背景添充颜色
  imagefill($this->image, 0, 0, $backColor);
  //设置边框颜色
  $border=imagecolorallocate($this->image, 0, 0, 0);
  //画出矩形边框
  imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $border);
}
private function setDisturbColor(){
  for($i=0; $idisturbColorNum; $i++){
  $color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
  imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color);
  }
  for($i=0; $iimage, rand(200, 255), rand(200, 255), rand(200, 255));
  imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(30, 300), rand(20, 200), 55, 44, $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 codeNum; $i++){
  $char=$code{rand(0, strlen($code)-1)};
  $string.=$char;
  }
  return $string;
}
private function outputText($fontFace=""){
  for($i=0; $icodeNum; $i++){
  $fontcolor=imagecolorallocate($this->image, rand(0, 128), rand(0, 128), rand(0, 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, $x, $y, $this->checkCode{$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,$fontsize,rand(-30, 30),$x,$y ,$fontcolor, $fontFace, $this->checkCode{$i});
  }
  }
}
private function outputImage() {
  if(imagetypes() & ){
  header("Content-Type:image/gif");
  imagepng($this->image);
  }else if(imagetypes() & ){
  header("Content-Type:image/jpeg");
  imagepng($this->image);
  }else if(imagetypes() & ){
  header("Content-Type:image/png");
  imagepng($this->image);
  }else if(imagetypes() & ){
  header("Content-Type:image/vnd.wap.wbmp");
  imagepng($this->image);
  }else{
  die("

HP不支持图像创建");
  }
}
function __destruct(){
  imagedestroy($this->image);
}
}

使用如下：
测试，调用验证码类
code.php
showImage();  //输出到页面中供注册或登录使用
$_SESSION["code"]=$code->getCheckCode(); //将验证码保存到服务器中


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