PHP+javascript creates verification code source code with prompts for sharing-PHP Tutorial-php.cn

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

高洛峰

Release： 2023-03-04 19:02:01

Original

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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>

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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;
}

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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
?>

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

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