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

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.chmod">
 <refnamediv>
  <refname>chmod</refname>
  <refpurpose>Changes file mode</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>chmod</methodname>
   <methodparam><type>string</type><parameter>filename</parameter></methodparam>
   <methodparam><type>int</type><parameter>mode</parameter></methodparam>
  </methodsynopsis>
  <para>
   Attempts to change the mode of the specified file to that given in
   <parameter>mode</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       Path to the file.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>mode</parameter></term>
     <listitem>
      <para>
       Note that <parameter>mode</parameter> is not automatically
       assumed to be an octal value, so strings (such as "g+w") will
       not work properly. To ensure the expected operation,
       you need to prefix <parameter>mode</parameter> with a zero (0):
      </para>
      <para>
       <informalexample>
        <programlisting role="php">
<![CDATA[
<?php
chmod("/somedir/somefile", 755);   // decimal; probably incorrect
chmod("/somedir/somefile", "u+rwx,go+rx"); // string; incorrect
chmod("/somedir/somefile", 0755);  // octal; correct value of mode
?>
]]>
        </programlisting>
       </informalexample>
      </para>
      <para>
       The <parameter>mode</parameter> parameter consists of three octal
       number components specifying access restrictions for the owner,
       the user group in which the owner is in, and to everybody else in
       this order. One component can be computed by adding up the needed
       permissions for that target user base. Number 1 means that you
       grant execute rights, number 2 means that you make the file
       writeable, number 4 means that you make the file readable. Add
       up these numbers to specify needed rights. You can also read more
       about modes on Unix systems with '<command>man 1 chmod</command>'
       and '<command>man 2 chmod</command>'.
      </para>
      <para>
       <informalexample>
        <programlisting role="php">
<![CDATA[
<?php
// Read and write for owner, nothing for everybody else
chmod("/somedir/somefile", 0600);

// Read and write for owner, read for everybody else
chmod("/somedir/somefile", 0644);

// Everything for owner, read and execute for others
chmod("/somedir/somefile", 0755);

// Everything for owner, read and execute for owner's group
chmod("/somedir/somefile", 0750);
?>
]]>
        </programlisting>
       </informalexample>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    The current user is the user under which PHP runs. It is probably not the
    same user you use for normal shell or FTP access. The mode can be changed
    only by user who owns the file on most systems.
   </para>
  </note>
  &note.no-remote;
  <note>
   <para>
    When &safemode; is enabled, PHP checks whether the files or directories
    you are about to operate on have the same UID (owner) as the script that
    is being executed. In addition, you cannot set the SUID, SGID and sticky
    bits.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>chown</function></member>
    <member><function>chgrp</function></member>
    <member><function>fileperms</function></member>
    <member><function>stat</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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