Home >Backend Development >PHP Tutorial >PHP+javascript creates verification code source code with prompts for sharing

PHP+javascript creates verification code source code with prompts for sharing

高洛峰Original: 2017-01-13 14:44:041928browse

html code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>简单验证码</title>
</head>
<script language="javascript" src="js/checked.js"></script>
<body>
<form id="register" name="register" method="post" >
<table align="center">
    <tr>
      <td ><div align="right">验证码：</div></td>
      <td ><input id="yzm" type="text" name="yzm" size="8" onBlur="javascript:chkyzm(form)" onMouseOver="this.style.backgroundColor=&#39;#ffffff&#39;" onMouseOut="this.style.backgroundColor=&#39;#e8f4ff&#39;"/></td><td>
        <input id="yzm2" type="hidden" value="" /></td>
      <td align="center" valign="middle"><script>yzm()</script></td>
      <td ><a href="javascript:code()" style="text-decoration:none">看不清</a></td>
      <td width="150"  align="center"><div id="yzm1"><font color="#999999">请输入验证码</font></div></td>
    </tr>  
</table> 
  </form>
</body>
</html>

JS code:

function chkyzm(form){     //对验证码进行验证
 if(form.yzm.value==""){
  yzm1.innerHTML="<font color=#FF0000>×验证码不能为空</font>"; 
 }else if(form.yzm.value!=form.yzm2.value){
  yzm1.innerHTML="<font color=#FF0000>×验证码输入错误</font>";
 }else{
  yzm1.innerHTML="<font color=green>√验证码输入正确</font>";
 }
}
function yzm(){      //生成验证码
 var num1=Math.round(Math.random()*1000000);//随机小数放大
 var num=num1.toString().substr(0,4);//取4位整数
 var yzm2=document.getElementById("yzm2");
 document.write("<img name=codeimg src=yzm.php?num="+num+"&#39;>");
 yzm2.value=num;
}
function code(){      //重置验证码
 var num1=Math.round(Math.random()*1000000);
 var num=num1.toString().substr(0,4);
 var yzm2=document.getElementById("yzm2");
 document.codeimg.src="yzm.php?num="+num;
 yzm2.value=num;
}

yzm.php code:

<?php
header("Content-type: image/png");
$im=imagecreate(66,22);       //创建画布
$black=imagecolorallocate($im,0,0,0);   //定义背景
$white=imagecolorallocate($im,255,255,255);  //定义背景
$gray=imagecolorallocate($im,200,200,200);  //定义背景
imagefill($im,0,0,$gray);      //填充颜色
for($i=0;$i<4;$i++){ //定义4位随机数
 $str=mt_rand(1,5);  //定义随机字符所在位置的的Y坐标
 $size=mt_rand(6,9); //定义随机字符的字体
 $authnum=substr($_GET[num],$i,1);  //获取超级链接中传递的验证码
 imagestring($im,$size,(3+$i*15),$str,$authnum,imagecolorallocate($im,rand(0,250),rand(0,250),rand(0,250)));//rand(0,500)数字的模糊程度
}       //水平输出字符串
for($i=0;$i<200;$i++){  //执行for循环，为验证码添加模糊背景
  $randcolor=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255)); //创建背景
  imagesetpixel($im,rand()%70,rand()%30,$randcolor);  //绘制单一元素
}
imagepng($im);    //生成png图像
imagedestroy($im);   //销毁图像
?>

Note: PHP needs to be configured to execute related methods.

For more PHP+javascript production and prompt verification code source code sharing related articles, please pay attention to the PHP Chinese website!

Statement：

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

Previous article：Js+php implements asynchronous drag and drop upload of filesNext article：Js+php implements asynchronous drag and drop upload of files

See more

PHP+javascript creates verification code source code with prompts for sharing

Related articles