Home >Backend Development >PHP Tutorial >PHP method to generate clickable refresh verification code and simple example
PHP method to generate clickable refresh verification code and simple example
- 墨辰丷Original
- 2018-06-02 11:27:141813browse
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>
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);
?>
Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.
Related recommendations:
PHP method to implement sorting of a certain key in a two-dimensional array
PHP automatically identifies the mobile terminal currently in use
PHP custom function format json data instance
The above is the detailed content of PHP method to generate clickable refresh verification code and simple example. For more information, please follow other related articles on the PHP Chinese website!