php-doc-en/reference/xattr/functions/xattr-supported.xml
2011-08-16 11:38:58 +00:00

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<?xml version="1.0" encoding="UTF-8"?>
<!-- $Revision$ -->
<!-- Generated by xml_proto.php v2.0. Found in /scripts directory of phpdoc. -->
<refentry xml:id="function.xattr-supported" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>xattr_supported</refname>
<refpurpose>
Check if filesystem supports extended attributes
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>xattr_supported</methodname>
<methodparam><type>string</type><parameter>filename</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
</methodsynopsis>
<para>
This functions checks if the filesystem holding the given file supports
extended attributes. Read access to the file is required.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>filename</parameter></term>
<listitem>
<para>
The path of the tested file.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>flags</parameter></term>
<listitem>
<para>
<table>
<title>Supported xattr flags</title>
<tgroup cols="2">
<tbody>
<row>
<entry><constant>XATTR_DONTFOLLOW</constant></entry>
<entry>Do not follow the symbolic link but operate on symbolic link itself.</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
This function returns &true; if filesystem supports extended attributes,
&false; if it doesn't and &null; if it can't be determined (for example
wrong path or lack of permissions to file).
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>xattr_supported</function> example</title>
<para>
The following code checks if we can use extended attributes.
</para>
<programlisting role="php">
<![CDATA[
<?php
$file = 'some_file';
if (xattr_supported($file)) {
/* ... make use of some xattr_* functions ... */
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>xattr_get</function></member>
<member><function>xattr_list</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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