Question

php 如何判断上传的文件类型

<form name="form1" enctype="multipart/form-data"

method="post" action="upload.php"><input type="file" name="userfile" size="20%"><input type="submit"

value="上传">
</form>

////////下面为UPLOAD.PHP
<?php
if(!@copy($userfile,"upload_file/$userfile_name"))
{
echo "上存失败";
}
else
{
//echo '<font color=blue><strong>'.$userfile.'</font>'.' 上存成功到upload_file/'.$userfile_name;
?>
<script language="JavaScript">
parent.form2.pic.value='<? echo "upload_file/".$userfile_name; ?>';
</script>
<?
}
?>

我用上面PHP代码上传文件,怎样判断文件类型以限制上传呢?如我想禁止PHP,ASP文件上传应加什么代码?加在哪里?
谢谢

Answer 1

用JAVASCRIPT判断文件后缀，给form加上onsubmit="return chk()"
<script language="javascript">
function chk () {
Ary = form1.userfile.value.split('.');
filetype=Ary[Ary.length-1];
if (filetype=='txt')
{
alert ('Error');
return false;
}
}
</script>