Table of Contents
php生成图片验证码的实例讲解_PHP
May 30, 2016 am 08:47 AM
php generates verification code
本文以实例演示5种验证码,并介绍生成验证码的函数。PHP生成验证码的原理:通过GD库,生成一张带验证码的图片,并将验证码保存在Session中。
1、HTML
5中验证码HTML代码如下:
<div class="demo"> <h3 id="数字验证码">1、数字验证码</h3> <p>验证码:<input type="text" class="input" id="code_num" name="code_num" maxlength="4" /> <img src="/static/imghw/default1.png" data-src="code_num.php" class="lazy" id="getcode_num" title="看不清,点击换一张" align="absmiddle" / alt="php生成图片验证码的实例讲解_PHP" ></p> <p><input type="button" class="btn" id="chk_num" value="提交" /></p> </div> <div class="demo"> <h3 id="数字-字母验证码">2、数字+字母验证码</h3> <p>验证码:<input type="text" class="input" id="code_char" maxlength="4" /> <img src="/static/imghw/default1.png" data-src="code_char.php" class="lazy" id="getcode_char" title="看不清,点击换一张" align="absmiddle" / alt="php生成图片验证码的实例讲解_PHP" ></p> <p><input type="button" class="btn" id="chk_char" value="提交" /></p> </div> <div class="demo"> <h3 id="中文验证码">3、中文验证码</h3> <p>验证码:<input type="text" class="input" id="code_zh" maxlength="4" /> <img src="/static/imghw/default1.png" data-src="code_zh.php" class="lazy" id="getcode_zh" title="看不清,点击换一张" align="absmiddle" / alt="php生成图片验证码的实例讲解_PHP" ></p> <p><input type="button" class="btn" id="chk_zh" value="提交" /></p> </div> <div class="demo"> <h3 id="仿google验证码">4、仿google验证码</h3> <p>验证码:<input type="text" class="input" id="code_gg" maxlength="4" /> <img src="/static/imghw/default1.png" data-src="code_gg.php" class="lazy" id="getcode_gg" title="看不清,点击换一张" align="absmiddle" / alt="php生成图片验证码的实例讲解_PHP" ></p> <p><input type="button" class="btn" id="chk_gg" value="提交" /></p> </div> <div class="demo"> <h3 id="算术验证码">5、算术验证码</h3> <p>验证码:<input type="text" class="input" id="code_math" maxlength="4" /> <img src="/static/imghw/default1.png" data-src="code_math.php" class="lazy" id="getcode_math" title="看不清,点击换一张" align="absmiddle" / alt="php生成图片验证码的实例讲解_PHP" ></p> <p><input type="button" class="btn" id="chk_math" value="提交" /></p> </div>
Copy after login
2、js验证
$(function() { $("#getcode_num").click(function() { //数字验证 $(this).attr("src", 'code_num.php?' + Math.random()); }); $("#chk_num").click(function() { var code_num = $("#code_num").val(); $.post("chk_code.php?act=num", { code: code_num }, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); //数字+字母验证 $("#getcode_char").click(function() { $(this).attr("src", 'code_char.php?' + Math.random()); }); $("#chk_char").click(function() { var code_char = $("#code_char").val(); $.post("chk_code.php?act=char", { code: code_char }, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); //中文验证码 $("#getcode_zh").click(function() { $(this).attr("src", 'code_zh.php?' + Math.random()); }); $("#chk_zh").click(function() { var code_zh = escape($("#code_zh").val()); $.post("chk_code.php?act=zh", { code: code_zh }, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); //google验证 $("#getcode_gg").click(function() { $(this).attr("src", 'code_gg.php?' + Math.random()); }); $("#chk_gg").click(function() { var code_gg = $("#code_gg").val(); $.post("chk_code.php?act=gg", { code: code_gg }, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); //算术验证 $("#getcode_math").click(function() { $(this).attr("src", 'code_math.php?' + Math.random()); }); $("#chk_math").click(function() { var code_math = $("#code_math").val(); $.post("chk_code.php?act=math", { code: code_math }, function(msg) { if (msg == 1) { alert("验证码正确!"); } else { alert("验证码错误!"); } }); }); });
Copy after login
3、PHP生成验证码
session_start(); getCode(4,60,20); function getCode($num,$w,$h) { $code = ""; for ($i = 0; $i < $num; $i++) { $code .= rand(0, 9); } //4位验证码也可以用rand(1000,9999)直接生成 //将生成的验证码写入session,备验证时用 $_SESSION["helloweba_num"] = $code; //创建图片,定义颜色值 header("Content-type: image/PNG"); $im = imagecreate($w, $h); $black = imagecolorallocate($im, 0, 0, 0); $gray = imagecolorallocate($im, 200, 200, 200); $bgcolor = imagecolorallocate($im, 255, 255, 255); //填充背景 imagefill($im, 0, 0, $gray); //画边框 imagerectangle($im, 0, 0, $w-1, $h-1, $black); //随机绘制两条虚线,起干扰作用 $style = array ($black,$black,$black,$black,$black, $gray,$gray,$gray,$gray,$gray ); imagesetstyle($im, $style); $y1 = rand(0, $h); $y2 = rand(0, $h); $y3 = rand(0, $h); $y4 = rand(0, $h); imageline($im, 0, $y1, $w, $y3, IMG_COLOR_STYLED); imageline($im, 0, $y2, $w, $y4, IMG_COLOR_STYLED); //在画布上随机生成大量黑点,起干扰作用; for ($i = 0; $i < 80; $i++) { imagesetpixel($im, rand(0, $w), rand(0, $h), $black); } //将数字随机显示在画布上,字符的水平间距和位置都按一定波动范围随机生成 $strx = rand(3, 8); for ($i = 0; $i < $num; $i++) { $strpos = rand(1, 6); imagestring($im, 5, $strx, $strpos, substr($code, $i, 1), $black); $strx += rand(8, 12); } imagepng($im);//输出图片 imagedestroy($im);//释放图片所占内存 }
Copy after login
以上就是本文的全部内容,希望对大家的学习有所帮助。
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot Article
How Long Does It Take To Beat Split Fiction?
3 weeks ago
By DDD
Repo: How To Revive Teammates
3 weeks ago
By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago
By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
1 weeks ago
By 尊渡假赌尊渡假赌尊渡假赌

Hot tools Tags

Hot Article
How Long Does It Take To Beat Split Fiction?
3 weeks ago
By DDD
Repo: How To Revive Teammates
3 weeks ago
By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago
By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
1 weeks ago
By 尊渡假赌尊渡假赌尊渡假赌

Hot Article Tags

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

11 Best PHP URL Shortener Scripts (Free and Premium)

Working with Flash Session Data in Laravel

Simplified HTTP Response Mocking in Laravel Tests

Build a React App With a Laravel Back End: Part 2, React

cURL in PHP: How to Use the PHP cURL Extension in REST APIs

12 Best PHP Chat Scripts on CodeCanyon
