fileperms.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.fileperms" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>fileperms</refname>
  <refpurpose>Gets file permissions</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>int</type><type>false</type></type><methodname>fileperms</methodname>
   <methodparam><type>string</type><parameter>filename</parameter></methodparam>
  </methodsynopsis>
  <para>
   Gets permissions for the given file.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       Path to the file.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the file's permissions as a numeric mode. Lower bits of this mode
   are the same as the permissions expected by <function>chmod</function>,
   however on most platforms the return value will also include information on
   the type of file given as <parameter>filename</parameter>. The examples
   below demonstrate how to test the return value for specific permissions and
   file types on POSIX systems, including Linux and macOS.
  </para>
  <para>
   For local files, the specific return value is that of the
   <literal>st_mode</literal> member of the structure returned by the C
   library's <function>stat</function> function. Exactly which bits are set
   can vary from platform to platform, and looking up your specific platform's
   documentation is recommended if parsing the non-permission bits of the
   return value is required.
  </para>
  <para>
   Returns &false; on failure.
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  &fs.emits.warning.on.failure;
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Display permissions as an octal value</title>
    <programlisting role="php">
<![CDATA[
<?php
echo substr(sprintf('%o', fileperms('/tmp')), -4);
echo substr(sprintf('%o', fileperms('/etc/passwd')), -4);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
1777
0644
]]>
    </screen>
   </example>
   <example>
    <title>Display full permissions</title>
    <programlisting role="php">
<![CDATA[
<?php
$perms = fileperms('/etc/passwd');

switch ($perms & 0xF000) {
    case 0xC000: // socket
        $info = 's';
        break;
    case 0xA000: // symbolic link
        $info = 'l';
        break;
    case 0x8000: // regular
        $info = 'r';
        break;
    case 0x6000: // block special
        $info = 'b';
        break;
    case 0x4000: // directory
        $info = 'd';
        break;
    case 0x2000: // character special
        $info = 'c';
        break;
    case 0x1000: // FIFO pipe
        $info = 'p';
        break;
    default: // unknown
        $info = 'u';
}

// Owner
$info .= (($perms & 0x0100) ? 'r' : '-');
$info .= (($perms & 0x0080) ? 'w' : '-');
$info .= (($perms & 0x0040) ?
            (($perms & 0x0800) ? 's' : 'x' ) :
            (($perms & 0x0800) ? 'S' : '-'));

// Group
$info .= (($perms & 0x0020) ? 'r' : '-');
$info .= (($perms & 0x0010) ? 'w' : '-');
$info .= (($perms & 0x0008) ?
            (($perms & 0x0400) ? 's' : 'x' ) :
            (($perms & 0x0400) ? 'S' : '-'));

// World
$info .= (($perms & 0x0004) ? 'r' : '-');
$info .= (($perms & 0x0002) ? 'w' : '-');
$info .= (($perms & 0x0001) ?
            (($perms & 0x0200) ? 't' : 'x' ) :
            (($perms & 0x0200) ? 'T' : '-'));

echo $info;
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
-rw-r--r--
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &note.clearstatcache;
  &tip.fopen-wrapper.stat;
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>chmod</function></member>
    <member><function>is_readable</function></member>
    <member><function>stat</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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