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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.readfile">
<refnamediv>
<refname>readfile</refname>
<refpurpose>Outputs a file</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>int</type><type>false</type></type><methodname>readfile</methodname>
<methodparam><type>string</type><parameter>filename</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>use_include_path</parameter><initializer>&false;</initializer></methodparam>
<methodparam choice="opt"><type class="union"><type>resource</type><type>null</type></type><parameter>context</parameter><initializer>&null;</initializer></methodparam>
</methodsynopsis>
<para>
Reads a file and writes it to the output buffer.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>filename</parameter></term>
<listitem>
<para>
The filename being read.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>use_include_path</parameter></term>
<listitem>
<para>
You can use the optional second parameter and set it to &true;, if
you want to search for the file in the <link
linkend="ini.include-path">include_path</link>, too.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>context</parameter></term>
<listitem>
¬e.context-support;
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the number of bytes read from the file on success,
&return.falseforfailure;
</para>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
&fs.emits.warning.on.failure;
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Forcing a download using <function>readfile</function></title>
<programlisting role="php">
<![CDATA[
<?php
$file = 'monkey.gif';
if (file_exists($file)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="'.basename($file).'"');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
readfile($file);
exit;
}
?>
]]>
</programlisting>
&example.outputs.similar;
<mediaobject>
<alt>Open / Save dialogue</alt>
<imageobject>
<imagedata fileref="en/reference/filesystem/figures/readfile.png"/>
</imageobject>
</mediaobject>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
<function>readfile</function> will not present any memory issues,
even when sending large files, on its own. If you encounter an
out of memory error ensure that output buffering is off with
<function>ob_get_level</function>.
</para>
</note>
&tip.fopen-wrapper;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>fpassthru</function></member>
<member><function>file</function></member>
<member><function>fopen</function></member>
<member><function>include</function></member>
<member><function>require</function></member>
<member><function>virtual</function></member>
<member><function>file_get_contents</function></member>
<member><xref linkend="wrappers"/></member>
</simplelist>
</para>
</refsect1>
</refentry>
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sgml-always-quote-attributes:t
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sgml-parent-document:nil
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-->
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