<?xml version="1.0" encoding="iso-8859-1"?>
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<refentry id="function.umask">
 <refnamediv>
  <refname>umask</refname>
  <refpurpose>Changes the current umask</refpurpose>
 </refnamediv>
 <refsect1>
  <title>Description</title>
  <methodsynopsis>
   <type>int</type><methodname>umask</methodname>
   <methodparam choice="opt"><type>int</type><parameter>mask</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>umask</function> sets PHP's umask to
   <parameter>mask</parameter> &amp; 0777 and returns the old
   umask. When PHP is being used as a server module, the umask
   is restored when each request is finished.
  </para>
  <para>
   <function>umask</function> without arguments simply returns the
   current umask.
  </para>
  <note>
   <para>
    Avoid using this function in multithreaded webservers. It is better to
    change the file permissions with <function>chmod</function> after
    creating the file. Using <function>umask</function> can lead to
    unexpected behavior of concurrently running scripts and the webserver
    itself because they all use the same umask.
   </para>
  </note>
  <para>
   <example>
    <title><function>umask</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$old = umask(0);
chmod("/path/some_dir/some_file.txt", 0755);
umask($old);

// Checking
if ($old != umask()) {
    die('An error occured while changing back the umask');
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
</refentry>

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