具體如下：
html檔案:
<html> <head> <title>驗證碼</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()">換一張</a> </body></html>
驗證碼檔案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);?>
總結：以上就是本篇文的全部內容，希望能對大家的學習有所協助。
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