一般我们在做网页的时候,再设计用户登录,注册或者留言的时候都经常用到验证码,下面是一种简单实用的php网页验证码的生成和检验过程。 jQuery下载地址:http://docs.jquery.com/Downloading_jQuery testcode.php !DOCTYPE html PUBLIC -//W3C//DTD XHTML 1
一般我们在做网页的时候,再设计用户登录,注册或者留言的时候都经常用到验证码,下面是一种简单实用的php网页验证码的生成和检验过程。
jQuery下载地址:http://docs.jquery.com/Downloading_jQuery
testcode.php
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>验证码</title> <style> .wrong{ color:red;} .right{ color:black;} </style> <script language="javascript" src="js/jquery-1.6.min.js"></script> <script language="javascript"> function check_code(){ var URL = "checkCode.php"; var RequestData = 'action=checkcode&code='+$('#R-code').val(); $.ajax({ type:'POST', url:URL, data:RequestData, async:false, cache: false, success:function(responseData){ var Result = eval('('+responseData+')'); if(Result.verifycode=='Y'){ $('#info-code').removeClass().html('验证码输入正确').addClass("right"); } else $('#info-code').removeClass().html('验证码输入错误').addClass("wrong"); } }); } function refresh_code(){ document.getElementById("imgcode").src="createCode.php?a="+Math.random(); } </script> <?php function getCodeHtml(){ $codehtml='<div id="codetest">' .'<h2 id="Code-Test">Code Test</h2>' .'<label for="R-code">Code:</label>' .'<img src="/static/imghwm/default1.png" data-src="createCode.php" class="lazy" id="imgcode" alt="验证码"><a href="javascript:refresh_code()">看不清?换一张</a><br>' .'<input id="R-code"><span id="info-code"></span><br>' .'<input type="button" onclick="check_code();" value="Check">' .''; echo $codehtml; } echo getCodeHtml(); ?>
createCode.php
<?php //生成验证码 session_start(); $codeNum=4; //验证码个数 $codeWidth=80; //验证码宽度 $codeHeight=18; //验证码高度 $code=' '; for($i=0;$i<$codeNum;$i++){ //生成验证码 switch(rand(0,2)) { case 0:$code[$i]=chr(rand(48,57)); break; //数字 case 1:$code[$i]=chr(rand(65,90)); break; //大写字母 case 2:$code[$i]=chr(rand(97,122));break; //小写字母 } } $_SESSION["VerifyCode"]=$code; $image=imagecreate($codeWidth,$codeHeight); imagecolorallocate($image,255,255,255); //生成干扰像素 for($i=0;$i<80;$i++){ $dis_color=imagecolorallocate($image,rand(0,2555),rand(0,255),rand(0,255)); imagesetpixel($image,rand(1,$codeWidth),rand(1,$codeHeight),$dis_color); } //打印字符到图像 for($i=0;$i<$codeNum;$i++){ $char_color=imagecolorallocate($image,rand(0,2555),rand(0,255),rand(0,255)); imagechar($image,60,($codeWidth/$codeNum)*$i,rand(0,5),$code[$i],$char_color); } header("Content-type:image/png"); imagepng($image); //输出图像到浏览器 imagedestroy($image); //释放资源 ?>
checkCode.php
<?php session_start(); @$postcode = $_POST['code']; if((strtoupper($postcode)) == strtoupper(($_SESSION["VerifyCode"]))) echo '{"verifycode":"Y"}'; else echo '{"verifycode":"N"}'; ?>

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