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

<?xml version="1.0" encoding="utf-8"?>
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.filectime">
 <refnamediv>
  <refname>filectime</refname>
  <refpurpose>Gets inode change time of file</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>filectime</methodname>
   <methodparam><type>string</type><parameter>filename</parameter></methodparam>
  </methodsynopsis>
  <para>
   Gets the inode change time of a 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 time the file was last changed, &return.falseforfailure;.
   The time is returned as a Unix timestamp.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>A <function>filectime</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php

// outputs e.g.  somefile.txt was last changed: December 29 2002 22:16:23.

$filename = 'somefile.txt';
if (file_exists($filename)) {
    echo "$filename was last changed: " . date("F d Y H:i:s.", filectime($filename));
}

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

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

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    Note: In most Unix filesystems, a file is considered changed when its
    inode data is changed; that is, when the permissions, owner, group, or
    other metadata from the inode is updated. See also
    <function>filemtime</function> (which is what you want to use when you
    want to create "Last Modified" footers on web pages) and
    <function>fileatime</function>.
   </para>
  </note>
  <note>
   <para>
    Note also that in some Unix texts the ctime of a file is referred to as
    being the creation time of the file. This is wrong. There is no creation
    time for Unix files in most Unix filesystems.
   </para>
  </note>
  &note.filesystem-time-res;
  &note.clearstatcache;
  &tip.fopen-wrapper.stat;
 </refsect1>

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

</refentry>

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