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is-uploaded-file.xml
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is-uploaded-file.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- $Author$ -->
<!-- EN-Revision: c1bb7dd16da7b27352a48604d7ad99f477aba0f9 Maintainer: dallas Status: ready -->
<refentry xml:id="function.is-uploaded-file" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>is_uploaded_file</refname>
<refpurpose>判断文件是否是通过 HTTP POST 上传的</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>is_uploaded_file</methodname>
<methodparam><type>string</type><parameter>filename</parameter></methodparam>
</methodsynopsis>
<para>
如果 <parameter>filename</parameter> 所给出的文件是通过
HTTP POST 上传的则返回 &true;。这可以用来确保恶意的用户无法欺骗脚本去访问本不能访问的文件,例如
<filename>/etc/passwd</filename>。
</para>
<para>
这种检查显得格外重要,如果上传的文件有可能会造成对用户或本系统的其他用户显示其内容的话。
</para>
<para>
为了能使 <function>is_uploaded_file</function> 函数正常工作,必须指定类似于
<varname>$_FILES['userfile']['tmp_name']</varname> 的变量,而在从客户端上传的文件名
<varname>$_FILES['userfile']['name']</varname> 不能正常运作。
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>filename</parameter></term>
<listitem>
<para>
要检查的文件名。
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>is_uploaded_file</function> 例子</title>
<programlisting role="php">
<![CDATA[
<?php
if (is_uploaded_file($_FILES['userfile']['tmp_name'])) {
echo "File ". $_FILES['userfile']['name'] ." uploaded successfully.\n";
echo "Displaying contents\n";
readfile($_FILES['userfile']['tmp_name']);
} else {
echo "Possible file upload attack: ";
echo "filename '". $_FILES['userfile']['tmp_name'] . "'.";
}
?>]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>move_uploaded_file</function></member>
<member><varname>$_FILES</varname></member>
<member>关于用法的简单例子
<link linkend="features.file-upload">文件上传处理</link></member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->