PHP method to generate clickable refresh verification code and simple example-PHP Tutorial-php.cn

PHP method to generate clickable refresh verification code and simple example

墨辰丷

Release： 2023-03-29 14:06:01

Original

1652 people have browsed it

This article mainly introduces the verification code generated by PHP that can be clicked to refresh. It analyzes the implementation and call display method of PHP verification code in the form of simple examples. It involves the related skills of dynamically calling the verification code PHP file with js. Friends who need it can For reference,

is as follows:

html file:

<html>
 <head>
   <title>验证码</title>
 </head>
  <script type="text/javascript">
    function yanzheng(){
      var im=document.getElementsByTagName("img");
      im[0].src="gd.php?temp="+(new Date().getTime().toString(36));
    }
  </script>
 <body>
  <img src="gd.php"/><a href="#" onclick="yanzheng()">换一张</a>
 </body>
</html>

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Verification code file gd.php:

<?php
$im=imagecreate(50,20);
$b=imagecolorallocate($im,0,0,0);
$w=imagecolorallocate($im,255,255,255);
$mask="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$text="";
for($i=1;$i<=4;$i++){
  $index=rand(0,61);
  $text.=$mask{$index};
}
imagestring($im,3,rand(10,20),rand(0,10),$text,$w);
header("Content-type:image/jpeg");
imagejpeg($im);
?>

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Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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