PHP教程:一些相关常用PHP实例(2)
5.4 文件上传
你可以利用PHP实现文件的功能，注意客户端的浏览器应该是Netscape3以上或者IE3以上。以下就是该功能的简单演示：
( upload.html ):
<HTML>
<HEAD>
<TITLE>Upload Your File</TITLE>
</HEAD>
<BODY>
<FORM ACTION="receiver.php3"
ENCTYPE="multipart/form-data" METHOD=POST>
<INPUT TYPE="HIDDEN"
NAME="MAX_FILE_SIZE" VALUE="2000000">
<INPUT TYPE="FILE"
NAME="uploadfile" SIZE="24" MAXLENGTH="80">
<BR><BR>
<INPUT TYPE="SUBMIT" VALUE="Upload File!"
NAME="sendit">
<INPUT TYPE="SUBMIT" VALUE="Cancel"
NAME="cancelit"><BR>
</FORM>
<I><FONT SIZE="2">(You may notice a slight
delay while we upload your file.)</FONT></I>
</BODY>
</HTML>
下面是处理上传的文件：
( receiver.php3 ):
<?
function do_upload ()
{
global ＄uploadfile, ＄uploadfile_size;
global ＄local_file, ＄error_msg;
if ( ＄uploadfile == "none" )
{
＄error_msg = "You did not specify a file for uploading.";
return;
}
if ( ＄uploadfile_size > 2000000 )
{
＄error_msg = "Sorry, your file is too large.";
return;
}
＄the_time = time ();
// 你需要对以下目录有写权限
＄upload_dir = "/local/uploads";
＄local_file = "＄upload_dir/＄the_time";
if ( file_exists ( '＄local_file' ) )
{
＄seq = 1;
while ( file_exists ( "＄upload_dir/＄the_time＄seq" ) ) { ＄seq++; }
＄local_file = "＄upload_dir/＄the_time＄seq";
};
rename ( ＄uploadfile, ＄local_file );
display_page ();
}
function display_page ()
{
// 这里是你的页面内容
}
<HTML>
<HEAD>
<TITLE>php3 Receiving Script</TITLE>
</HEAD>
<BODY>
<?
if ( ＄error_msg ) { echo "<B>＄error_msg</B><BR><BR>"; }
if ( ＄sendit )
{
do_upload ();
}
elseif ( ＄cancelit )
{
header ( "Location: ＄some_other_script" );
exit;
}
else
{
some_other_func ();
}
?>
</BODY>
</HTML>