mirror of
https://github.com/sigmasternchen/php-doc-en
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c1bb7dd16d
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@305278 c90b9560-bf6c-de11-be94-00142212c4b1
114 lines
3.1 KiB
XML
114 lines
3.1 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.is-uploaded-file">
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<refnamediv>
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<refname>is_uploaded_file</refname>
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<refpurpose>Tells whether the file was uploaded via HTTP POST</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>is_uploaded_file</methodname>
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<methodparam><type>string</type><parameter>filename</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns &true; if the file named by <parameter>filename</parameter> was
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uploaded via HTTP POST. This is useful to help ensure that a
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malicious user hasn't tried to trick the script into working on
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files upon which it should not be working--for instance,
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<filename>/etc/passwd</filename>.
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</para>
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<para>
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This sort of check is especially important if there is any chance
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that anything done with uploaded files could reveal their
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contents to the user, or even to other users on the same
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system.
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</para>
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<para>
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For proper working, the function <function>is_uploaded_file</function> needs
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an argument like <varname>$_FILES['userfile']['tmp_name']</varname>, - the name of the uploaded
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file on the client's machine <varname>$_FILES['userfile']['name']</varname> does not work.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>filename</parameter></term>
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<listitem>
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<para>
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The filename being checked.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.success;
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>is_uploaded_file</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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if (is_uploaded_file($_FILES['userfile']['tmp_name'])) {
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echo "File ". $_FILES['userfile']['name'] ." uploaded successfully.\n";
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echo "Displaying contents\n";
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readfile($_FILES['userfile']['tmp_name']);
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} else {
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echo "Possible file upload attack: ";
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echo "filename '". $_FILES['userfile']['tmp_name'] . "'.";
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}
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?>]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>move_uploaded_file</function></member>
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<member><varname>$_FILES</varname></member>
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<member>See <link linkend="features.file-upload">Handling file uploads</link> for a simple usage example.</member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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