PHP编写的图片验证码类文件分享

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适用于自定义的验证码类!

PHP;"> PHP

/*

  • To change this license header,choose License Headers in Project Properties.
  • To change this template file,choose Tools | Templates
  • and open the template in the editor.
    */
    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

PHP;"> buildAndExportImage(); * * 作 者: luojing * 创建时间: 2013-3-27 上午11:42:12 */ class Captcha {
  1. private $width;//宽度
  2. private $height; //高度
  3. private $codeNum;//验证码字符<a href="/tag/shuliang/" target="_blank" class="keywords">数量</a>
  4. private $image;//验证码图像资源
  5. private $sessionKey;//session中保存的名字
  6. private $captcha;//验证码字符串
  7. const charWidth = 10;//单个字符宽度,根据<a href="/tag/shuchu/" target="_blank" class="keywords">输出</a>字符大小而变
  8. /**
  9. * 创建验证码类,初始化相关参数
  10. * @param $width <a href="/tag/tupian/" target="_blank" class="keywords">图片</a>宽度
  11. * @param $height <a href="/tag/tupian/" target="_blank" class="keywords">图片</a>高度
  12. * @param $codeNum 验证码字符<a href="/tag/shuliang/" target="_blank" class="keywords">数量</a>
  13. * @param $sessionKey session中保存的名字
  14. */
  15. function __construct($width = 50,$height = 20,$codeNum = 4,$sessionKey = 'captcha') {
  16. $this->width = $width;
  17. $this->height = $height;
  18. $this->codeNum = $codeNum;
  19. $this->sessionKey = $sessionKey;
  20. //保证最小高度和宽度
  21. if($height < 20) {
  22. $this->height = 20;
  23. }
  24. if($width < ($codeNum * self::charWidth + 10)) {//左右各保留5像素空隙
  25. $this->width = $codeNum * self::charWidth + 10;
  26. }
  27. }
  28. /**
  29. * 构造并<a href="/tag/shuchu/" target="_blank" class="keywords">输出</a>验证码<a href="/tag/tupian/" target="_blank" class="keywords">图片</a>
  30. */
  31. public function buildAndExportImage() {
  32. $this->createImage();
  33. $this->setDisturb();
  34. $this->setCaptcha();
  35. $this->exportImage();
  36. }
  37. /**
  38. * 构造图像,设置底色
  39. */
  40. private function createImage() {
  41. //创建图像
  42. $this->image = imagecreatetruecolor($this->width,$this->height);
  43. //创建背景色
  44. $bg = imagecolorallocate($this->image,mt_rand(220,255),255));
  45. //填充背景色
  46. imagefilledrectangle($this->image,$this->width - 1,$this->height - 1,$bg);
  47. }
  48. /**
  49. * 设置干扰元素
  50. */
  51. private function setDisturb() {
  52. //设置干扰点
  53. for($i = 0; $i < 150; $i++) {
  54. $color = imagecolorallocate($this->image,mt_rand(150,200),200));
  55. imagesetpixel($this->image,mt_rand(5,$this->width - 10),$this->height - 3),$color);
  56. }
  57. //设置干扰线
  58. for($i = 0; $i < 10; $i++) {
  59. $color = imagecolorallocate($this->image,220),220));
  60. imagearc($this->image,mt_rand(-10,mt_rand(30,300),mt_rand(20,55,44,$color);
  61. }
  62. //创建边框色
  63. $border = imagecolorallocate($this->image,50),50));
  64. //画边框
  65. imagerectangle($this->image,$border);
  66. }
  67. /**
  68. * 产生并绘制验证码
  69. */
  70. private function setCaptcha() {
  71. $str = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
  72. //<a href="/tag/shengcheng/" target="_blank" class="keywords">生成</a>验证码字符
  73. for($i = 0; $i < $this->codeNum; $i++) {
  74. $this->captcha .= $str{mt_rand(0,strlen($str) - 1)};
  75. }
  76. //绘制验证码
  77. for($i = 0; $i < strlen($this->captcha); $i++) {
  78. $color = imagecolorallocate($this->image,200));
  79. $x = floor(($this->width - 10)/$this->codeNum);
  80. $x = $x*$i + floor(($x-self::charWidth)/2) + 5;
  81. $y = mt_rand(2,$this->height - 20);
  82. imagechar($this->image,$x,$y,$this->captcha{$i},$color);
  83. }
  84. }
  85. /*
  86. * <a href="/tag/shuchu/" target="_blank" class="keywords">输出</a>图像,验证码保存到session中
  87. */
  88. private function exportImage() {
  89. if(imagetypes() & IMG_GIF){
  90. header('Content-type:image/gif');
  91. imagegif($this->image);
  92. } else if(imagetypes() & IMG_PNG){
  93. header('Content-type:image/png');
  94. imagepng($this->iamge);
  95. } else if(imagetypes() & IMG_JPEG) {
  96. header('Content-type:image/jpeg');
  97. imagepng($this->iamge);
  98. } else {
  99. imagedestroy($this->image);
  100. die("Don't support image type!");
  101. }
  102. //将验证码信息保存到session中,md5加密
  103. if(!isset($_SESSION)){
  104. session_start();
  105. }
  106. $_SESSION[$this->sessionKey] = md5($this->captcha);
  107. imagedestroy($this->image);
  108. }
  109. function __destruct() {
  110. unset($this->width,$this->height,$this->codeNum,$this->captcha);
  111. }

}

例三:

PHP;"> 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:

测试,调用验证码类 code.PHP

PHP;"> showImage(); //输出页面中供 注册登录使用 $_SESSION["code"]=$code->getCheckCode(); //将验证码保存到服务器中

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