PHP+jq实现验证码

来源：互联网发布：检测域名是否被墙编辑：程序博客网时间：2024/06/15 02:22

-前端页面

<div class="demo"><h3>2、数字验证码</h3><p>验证码：<input type="text" class="input" id="code_num" maxlength="4" /> <img src="../addons/lb_vote/code_char.php" id="getcode_num" title="看不清，点击换一张" align="absmiddle" /></p><p><input type="button" class="btn" id="chk_num" value="提交" /></p></div>

-jq

<!--验证码--><script type="text/javascript" src="../addons/lb_vote/Public/js/jquery.min.js"></script><script type="text/javascript">    $(function() { $("#getcode_num").click(function() { //数字验证 $(this).attr("src", 'code_char.php?' + Math.random()); }); $("#chk_num").click(function() { var code_num = $("#code_num").val(); $.post("../addons/lb_vote/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！");  } }); });});</script>

-code_char.php

<?phpsession_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, 255); $gray = imagecolorallocate($im, 255, 64, 0); $bgcolor = imagecolorallocate($im, 172, 83, 83); //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}?>

-chk_code.php

<?php  session_start();   $sessioncode=$_SESSION["helloweba_num"];   $code=$_POST['code'];   if($sessioncode==$code){       $msg=1;        echo json_encode($msg);   }else{    $msg=2;     echo json_encode($msg);   }?>

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