<HTML ><HEAD ><TITLE >is_uploaded_file</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Filesystem functions" HREF="ref.filesystem.html"><LINK REL="PREVIOUS" TITLE="is_readable" HREF="function.is-readable.html"><LINK REL="NEXT" TITLE="is_writable" HREF="function.is-writable.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.is-readable.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.is-writable.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.is-uploaded-file" ></A >is_uploaded_file</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN26452" ></A ><P > (PHP 3>= 3.0.17, PHP 4 >= 4.0.3)</P >is_uploaded_file -- Tells whether the file was uploaded via HTTP POST</DIV ><DIV CLASS="refsect1" ><A NAME="AEN26455" ></A ><H2 >Description</H2 >bool <B CLASS="methodname" >is_uploaded_file</B > ( string filename)<BR ></BR ><P > Returns <TT CLASS="constant" ><B >TRUE</B ></TT > if the file named by <TT CLASS="varname" >filename</TT > was uploaded via HTTP POST. This is useful to help ensure that a malicious user hasn't tried to trick the script into working on files upon which it should not be working--for instance, <TT CLASS="filename" >/etc/passwd</TT >. </P ><P > This sort of check is especially important if there is any chance that anything done with uploaded files could reveal their contents to the user, or even to other users on the same system. </P ><P > <B CLASS="function" >is_uploaded_file()</B > is available only in versions of PHP 3 after PHP 3.0.16, and in versions of PHP 4 after 4.0.2. If you are stuck using an earlier version, you can use the following function to help protect yourself: <DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >Note: </B > The following example will <SPAN CLASS="emphasis" ><I CLASS="emphasis" >not</I ></SPAN > work in versions of PHP 4 after 4.0.2. It depends on internal functionality of PHP which changed after that version. </P ></BLOCKQUOTE ></DIV > <TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="php" ><?php /* Userland test for uploaded file. */ function is_uploaded_file($filename) { if (!$tmp_file = get_cfg_var('upload_tmp_dir')) { $tmp_file = dirname(tempnam('', '')); } $tmp_file .= '/' . basename($filename); /* User might have trailing slash in php.ini... */ return (ereg_replace('/+', '/', $tmp_file) == $filename); } /* This is how to use it, since you also don't have * move_uploaded_file() in these older versions: */ if (is_uploaded_file($HTTP_POST_FILES['userfile'])) { copy($HTTP_POST_FILES['userfile'], "/place/to/put/uploaded/file"); } else { echo "Possible file upload attack: filename '$HTTP_POST_FILES[userfile]'."; } ?></PRE ></TD ></TR ></TABLE > </P ><P > See also <A HREF="function.move-uploaded-file.html" ><B CLASS="function" >move_uploaded_file()</B ></A >, and the section <A HREF="features.file-upload.html" >Handling file uploads</A > for a simple usage example. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.is-readable.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.is-writable.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >is_readable</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.filesystem.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >is_writable</TD ></TR ></TABLE ></DIV ></BODY ></HTML >