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

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  <refentry id="function.touch">
   <refnamediv>
    <refname>touch</refname>
    <refpurpose>Sets access and modification time of file</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>touch</methodname>
      <methodparam><type>string</type><parameter>filename</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>time</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>atime</parameter></methodparam>
     </methodsynopsis>
    <para>
     Attempts to set the access and modification times of the file named in the
     <parameter>filename</parameter> parameter to the value given in
     <parameter>time</parameter>. If <parameter>time</parameter>
     is not supplied, the current system time is used. If the third parameter,
     is present, the access time of the given
     filename is set to the value of <parameter>atime</parameter>.
     Note that the access time is always modified, regardless of the number
     of parameters.
    </para>
    <para>
     If the file does not exist, it will be created. &return.success;
    </para>
    <warning>
     <para>
      It is not currently possible to change the modification time of a
      directory with this function under Windows.
     </para>
    </warning>
    <para>
     <example>
      <title><function>touch</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
if (touch($FileName)) {
    echo "$FileName modification time has been changed to present time";
} else {
    echo "Sorry, could not change modification time of $FileName";
}
?>
]]>
      </programlisting>
     </example>
    </para>
   </refsect1>
  </refentry>

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