完美的php生成验证码程序代码
发布:smiling 来源: PHP粉丝网 添加日期:2014-08-18 15:24:37 浏览: 评论:0
本文章给大家介绍一个非常不错的生成验证码的php程序,首先当用户请求HTTP的时候,服务器端就创建一个唯一的sessionid,这个是session会话ID,然后就去启动GD库或者imagemagick这些画图工具,把程序生成的随机的字符写到一张图片里面,然后显示到客户端,再由用户输入提交数据,然后我们程序把生成验证保存在session中进行比较,这样就完成了验证码的生成与验证了.
新建一个PHP文件captcha_code_file.php,代码如下:
- //首先开启session
- session_start();
- //定义前台显示验证码长&宽
- $image_width = 120;
- $image_height = 40;
- $characters_on_image = 6;
- $font = './monofont.ttf';
- //The characters that can be used in the CAPTCHA code.
- //avoid confusing characters (l 1 and i for example)
- $possible_letters = '23456789bcdfghjkmnpqrstvwxyz';
- $random_dots = 10;
- $random_lines = 30;
- $captcha_text_color="0x142864";
- $captcha_noice_color = "0x142864";
- //定义要生成验证码的字符串
- $code = '';
- $i = 0;
- while ($i < $characters_on_image) {
- $code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1);
- $i++;
- }
- $font_size = $image_height * 0.75;
- $image = @imagecreate($image_width, $image_height);
- /* setting the background, text and noise colours here */
- $background_color = imagecolorallocate($image, 255, 255, 255);
- $arr_text_color = hexrgb($captcha_text_color);
- $text_color = imagecolorallocate($image, $arr_text_color['red'],
- $arr_text_color['green'], $arr_text_color['blue']);
- $arr_noice_color = hexrgb($captcha_noice_color);
- $image_noise_color = imagecolorallocate($image, $arr_noice_color['red'],
- $arr_noice_color['green'], $arr_noice_color['blue']);
- /* generating the dots randomly in background */
- for( $i=0; $i<$random_dots; $i++ ) {
- imagefilledellipse($image, mt_rand(0,$image_width),
- mt_rand(0,$image_height), 2, 3, $image_noise_color);
- }
- /* generating lines randomly in background of image */
- for( $i=0; $i<$random_lines; $i++ ) {
- imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height),
- mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color);
- }
- /* create a text box and add 6 letters code in it */
- $textbox = imagettfbbox($font_size, 0, $font, $code);
- $x = ($image_width - $textbox[4])/2;
- $y = ($image_height - $textbox[5])/2;
- imagettftext($image, $font_size, 0, $x, $y, $text_color, $font , $code);
- /* Show captcha image in the page html page */
- header('Content-Type: image/jpeg');// defining the image type to be shown in browser widow
- imagejpeg($image);//showing the image
- imagedestroy($image);//destroying the image instance
- //设置session,做验证
- //开源代码phpfensi.com
- $_SESSION['6_letters_code'] = $code;
- function hexrgb ($hexstr)
- {
- $int = hexdec($hexstr);
- return array("red" => 0xFF & ($int >> 0x10),
- "green" => 0xFF & ($int >> 0x8),
- "blue" => 0xFF & $int);
- }
调用页面显示验证码页面index.php,代码如下:
- <?php
- session_start();
- if(isset($_REQUEST['Submit'])){
- // code for check server side validation
- if(emptyempty($_SESSION['6_letters_code'] ) ||
- strcasecmp($_SESSION['6_letters_code'], $_POST['6_letters_code']) != 0)
- {
- $msg="您输入的验证码有误,请重新输入!";
- }else{
- echo "您输入的是正确的!";
- // Captcha verification is Correct. Final Code Execute here!
- }
- }
- ?>
- <style type="text/css">
- .table{
- font-family:Arial, Helvetica, sans-serif;
- font-size:12px;
- color:#333;
- background-color:#E4E4E4;
- }
- .table td{
- background-color:#F8F8F8;
- }
- </style>
- <form action="" method="post" name="form1" id="form1" >
- <table width="400" border="0" align="center" cellpadding="5" cellspacing="1">
- <?php if(isset($msg)){?>
- <tr>
- <td colspan="2" align="center" valign="top"><?php echo $msg;?></td>
- </tr>
- <?php } ?>
- <tr>
- <td align="right" valign="top"> 验证码Demo:</td>
- <td><img src="captcha_code_file.php?rand=<?php echo rand(0,20);?>" id='captchaimg' onclick="refreshCaptcha();" ><br>
- <label for='message'>请输入验证码:</label>
- <br>
- <input id="6_letters_code" name="6_letters_code" type="text">
- <br>
- 如果看不到,请 <a href='javascript: refreshCaptcha();'>点我</a> 刷新一下!
- </p></td>
- </tr>
- <tr>
- <td> </td>
- <td><input name="Submit" type="submit" onclick="return validate();" value="Submit"></td>
- </tr>
- </table>
- </form>
- <script type='text/javascript'>
- //定义的刷新请求
- function refreshCaptcha()
- {
- var img = document.images['captchaimg'];
- img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
- }
- </script>
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