PHP编写的图片验证码类文件分享
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2024-04-02 14:00:46
适用于自定义的验证码类!
适用于自定义的验证码类!
<?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($bg_color, 1,2)), hexdec(substr($bg_color, 3,2)), hexdec(substr($bg_color, 5,2))); imagefill($img, 0, 0, $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($color,1,2)), hexdec(substr($color, 3,2)), hexdec(substr($color,5,2))); $x = $this->width/$this->code_len; for( $i=0;$i<$this->code_len;$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;$i<100;$i++){ imagesetpixel($this->img, mt_rand(0, $this->width),mt_rand(0, $this->height), $pix_color); } for($j=0;$j<4;$j++){ imagesetthickness($this->img, mt_rand(1, 2)); imageline($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
<?php /** * 图片验证码类 * 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 * * 使用方法: * $captcha = new catpcha(); * $captcha->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 < 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), 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 < 150; $i++) { $color = imagecolorallocate($this->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 < 10; $i++) { $color = imagecolorallocate($this->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 < $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, 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}, $color); } } /* * 输出图像,验证码保存到session中 */ private function exportimage() { if(imagetypes() & img_gif){ header('content-type:image/gif'); imagegif($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:
<?php class validationcode { private $width; private $height; private $codenum; private $image; //图像资源 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*$height/15); if($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; $i<$this->disturbcolornum; $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; $i<10; $i++){ $color=imagecolorallocate($this->image, 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 < $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, 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() & 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 session_start(); include "validationcode.class.php"; $code=new validationcode(80, 20, 4); $code->showimage(); //输出到页面* 注册或登录使用 $_session["code"]=$code->getcheckcode(); //将验证码保存到服务器中