php-doc-en/reference/filesystem/functions/umask.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.umask">
 <refnamediv>
  <refname>umask</refname>
  <refpurpose>Changes the current umask</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <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>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>mask</parameter></term>
     <listitem>
      <para>
       The new umask.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   <function>umask</function> without arguments simply returns the
   current umask otherwise the old umask is returned.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <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 occurred while changing back the umask');
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <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>
 </refsect1>

</refentry>

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