PHP+javascript Make Authentication Code Source Sharing with Tips

2021-06-28 11:47:44
OfStack

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> Simple Authentication Code </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"> Verification Code: </div></td>
      <td ><input id="yzm" type="text" name="yzm" size="8" onBlur="javascript:chkyzm(form)" onMouseOver="this.style.backgroundColor='#ffffff'" onMouseOut="this.style.backgroundColor='#e8f4ff'"/></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"> Invisibility </a></td>
      <td width="150"  align="center"><div id="yzm1"><font color="#999999"> Please enter the verification code </font></div></td>
    </tr>  
</table> 
  </form>
</body>
</html>

JS code:


function chkyzm(form){     // Verify Authentication Code 
 if(form.yzm.value==""){
  yzm1.innerHTML="<font color=#FF0000> ×Authentication code cannot be empty </font>"; 
 }else if(form.yzm.value!=form.yzm2.value){
  yzm1.innerHTML="<font color=#FF0000> ×Authentication code input error </font>";
 }else{
  yzm1.innerHTML="<font color=green> _Verification code entered correctly </font>";
 }
}
function yzm(){      // Generate Authentication Code 
 var num1=Math.round(Math.random()*1000000);// Random decimal amplification 
 var num=num1.toString().substr(0,4);// take 4 Bit Integer 
 var yzm2=document.getElementById("yzm2");
 document.write("<img name=codeimg src=yzm.php?num="+num+"'>");
 yzm2.value=num;
}
function code(){      // Reset Authentication Code 
 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);       // Create Canvas 
$black=imagecolorallocate($im,0,0,0);   // Define Background 
$white=imagecolorallocate($im,255,255,255);  // Define Background 
$gray=imagecolorallocate($im,200,200,200);  // Define Background 
imagefill($im,0,0,$gray);      // fill color 
for($i=0;$i<4;$i++){ // Definition 4 Bit Random Numbers 
 $str=mt_rand(1,5);  // Defines where random characters are located Y coordinate 
 $size=mt_rand(6,9); // Define the font for random characters 
 $authnum=substr($_GET[num],$i,1);  // Get the authentication code passed in the hyperlink 
 imagestring($im,$size,(3+$i*15),$str,$authnum,imagecolorallocate($im,rand(0,250),rand(0,250),rand(0,250)));//rand(0,500) Fuzziness of numbers 
}       // Horizontal Output String 
for($i=0;$i<200;$i++){  // implement for Loop to add a blurred background to the Authentication Code 
  $randcolor=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255)); // Create Background 
  imagesetpixel($im,rand()%70,rand()%30,$randcolor);  // Draw a list 1 element 
}
imagepng($im);    // generate png image 
imagedestroy($im);   // Destroy Image 
?>

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

Operation effect: