PHP教程:一些相关常用PHP实例(4)
http://www.itjxue.com 2015-07-17 08:20 来源:未知 点击次数:
照片收藏夹
我们将引用基于HTTP的验证、文件系统函数和文件上传功能维护放置图像文件的目录。
同时我们需要建立一个可以列出在该目录下所有照片的页面。
文件上传
<?
include("include/common.inc");
// 我们在这里再做一次用户验证
if(!isset(＄PHP_AUTH_USER))
{
Header("WWW-Authenticate: Basic realm=\"＄MySiteName\"");
Header("HTTP/1.0 401 Unauthorized");
echo "Sorry, you are not authorized to upload files\n";
exit;
}
else
{
if ( !(＄PHP_AUTH_USER==＄MyName && ＄PHP_AUTH_PW==＄MyPassword ) )
{
// 如果是错误的用户名称/密码对，强制再次认证
Header("WWW-Authenticate: Basic realm=\"My Realm\"");
Header("HTTP/1.0 401 Unauthorized");
echo "ERROR : ＄PHP_AUTH_USER/＄PHP_AUTH_PW is invalid.<P>";
exit;
}
}
if ( ＄cancelit )
{
// 当浏览者按下"取消"按钮则转向首页面
header ( "Location: front_2.php3" );
exit;
}
function do_upload () {
global ＄userfile, ＄userfile_size, ＄userfile_name, ＄userfile_type;
global ＄local_file, ＄error_msg;
global ＄HTTP_REFERER;
if ( ＄userfile == "none" ) {
＄error_msg = "You did not specify a file for uploading.";
return;
}
if ( ＄userfile_size > 2000000 )
{
＄error_msg = "Sorry, your file is too large.";
return;
}
// Wherever you have write permission below...
＄upload_dir = "photos";
＄local_file = "＄upload_dir/＄userfile_name";
if ( file_exists ( ＄local_file ) ) {
＄error_msg = "Sorry, a file with that name already exists";
return;
};
// 你还可以由此检查文件名称/类型对以确定是何种文件：gif,jpg,mp3…
rename(＄userfile, ＄local_file);
echo "The file is uploaded<BR>\n";
echo "<A HREF=\"＄HTTP_REFERER\">Go Back</A><BR>\n";
}
＄title = "Upload File";
include("include/header.inc");
if (empty(＄userfile) || ＄userfile=="none")
{
// 输出以下表单
?>
<FORM ACTION="<? echo "＄PHP_SELF"; ?>" ENCTYPE="multipart/form-data" METHOD=POST>
<INPUT TYPE="HIDDEN" NAME="MAX_FILE_SIZE" VALUE="2000000">
<INPUT TYPE="FILE" NAME="userfile" 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>
<?
} else {
if ( ＄error_msg ) { echo "<B>＄error_msg</B><BR><BR>"; }
if ( ＄sendit ) {
do_upload ();
}
}
include("include/footer.inc");
?>
照片图库
<?
include("include/common.inc");
＄title = "Gallery";
include("include/header.inc");
?>
<P>
Here are some of our family photos. This PHP script can really
be made better, by splitting into multiple pages.
</P>
<?
＄d = dir("photos");
while(＄entry = ＄d->read())
{
if (is_file("photos/＄entry"))
echo "<IMG SRC=\"photos/＄entry\">\n";
}
＄d->close();
?>
<?
include("include/footer.inc");
?>
另外，你可以在文件上传的表单中加上一个输入元素去描述该上传的文件。这个元素将被存储在文件中，然后被以上的照片图库的那段代码所读出并显示出来。