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在线演示地址：
gb2312版本 http://tools.52php.cn/tools/base64_decode-gb2312.php
utf8版本 http://tools.52php.cn/tools/base64_decode-utf8.php
<div class="codetitle"><a style="CURSOR: pointer" data="28910" class="copybut" id="copybut28910" onclick="doCopy('code28910')"> 代码如下:<div class="codebody" id="code28910">
<?php
header('Content-Type: text/html; charset=gb2312');
$txt1 = stripslashes(trim( @$_POST['text1']));
$button = @$_POST['button'];
$down = @trim($_GET['down']);
if ($down==1) {
header("Content-type: command");
header("Content-Disposition: attachment; filename=base64_decode.txt");
$contents = file_get_contents(basename($_SERVER['PHP_SELF']));
echo $contents;
exit;
}
?>
<html xmlns="http://www.w3.org/1999/xhtml">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta content="Base64在线编码解码" name="keywords">
Base64在线编码解码 gb2312
<body topmargin="0" leftmargin="0" rightmargin="0" bottommargin="0">
<table border="0" width="100%" cellspacing="0" cellpadding="0" height="100%">
<tr><td height="20" bgcolor="#CCCCCC" align =right style="padding-right:5px;">
</td></tr><tr> | <form name="form1" method="post" action="">
Base64在线编码解码 gb2312 <a href="?down=1">源码下载
请输入转换的地址：
<textarea name="text1" rows="14" class="bginput" style="width:520px;"><?php echo htmlspecialchars($txt1,ENT_QUOTES);?>
请选择转换的方式：
<textarea rows="14" class="bginput" style="width:520px;"><?php
if($button=="编码") echo base64_encode($txt1);
if($button=="解码") echo mb_convert_encoding(base64_decode($txt1),"gb2312","UTF-8");
?>
</td></tr>
<tr><td height="10"></td></tr><tr> | </td>
</tr>
</table>
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