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    getlastmod

    (PHP 4, PHP 5, PHP 7, PHP 8)

    getlastmod — Retourne la date de dernière modification de la page

    Description

    getlastmod(): int|false

    Retourne la date de dernière modification du script principal en exécution.

    Si vous voulez récupérer la date de la dernière modification d'un fichier différent, utilisez la fonction filemtime().

    Liste de paramètres

    Cette fonction ne contient aucun paramètre.

    Valeurs de retour

    Retourne la date de dernière modification de la page. La valeur retournée est un timestamp UNIX, utilisable comme paramètre avec la fonction date(). Retourne false si une erreur survient.

    Exemples

    Exemple #1 Exemple avec getlastmod()

    <?php
    // affiche par exemple 'Dernière modification: April 20 2004 20:43:59.'
    echo "Dernière modification : " . date ("F d Y H:i:s.", getlastmod());
    ?>

    Voir aussi

    • date() - Formate un horodatage Unix
    • getmyuid() - Retourne l'UID du propriétaire du script actuel
    • getmygid() - Retourne le GID du propriétaire du script
    • get_current_user() - Retourne le nom du possesseur du script courant
    • getmyinode() - Retourne l'inode du script
    • getmypid() - Retourne le numéro de processus courant de PHP
    • filemtime() - Lit la date de dernière modification du fichier

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    User Contributed Notes 7 notes

    up
    10
    luca dot delpivo at gmail dot com
    12 years ago
    With better words getlastmod() returning the last time the script in which it is being called was modified, it does not require or use a parameter.
    up
    4
    Moro
    12 years ago
    Return latest mod time of all included files:

    <?php
    function get_page_mod_time() {
            $incls = get_included_files();
            $incls = array_filter($incls, "is_file");
            $mod_times = array_map('filemtime', $incls);
            $mod_time = max($mod_times);

        return     $mod_time;
    }
    ?>
    up
    0
    Ant P.
    14 years ago
    If you use register_shutdown_function() on certain SAPIs, various filesystem-related things inside the shutdown function might do unexpected things, one of which being this function can return false.

    On the other hand getlastmod() apparently caches the return value, so if you use it at least once in normal code it should work for the remainder of the request.
    up
    -1
    rwruck
    20 years ago
    DO NOT use this function unless you are absolutely sure both your Apache and PHP have been compiled with the same value for -DFILE_OFFSET_BITS.

    If not, this function will return the access time (or maybe even garbage) instead of the modification time due do Apache and PHP using different versions of the stat structure.

    This is true regardless of Apache and PHP version.

    To be on the safe side, always use the workaround already posted below:
    filemtime($_SERVER['SCRIPT_FILENAME'])
    up
    -2
    Anonymous
    20 years ago
    Setting the 'Last-Modified' header:
    <?php
    setlocale    (LC_TIME, "C");
    $ft = filemtime ('referencefile');
    $localt = mktime ();
    $gmtt = gmmktime ();
    $ft = $ft - $gmtt + $localt;
    $modified = strftime ("%a, %d %b %Y %T GMT", $ft);
    ?>
    up
    -8
    erik dot stetina at gmail dot com
    13 years ago
    function for displaying last modification time accross more direcotries. e.g. to display last modification date in "about" section of your web page

    <?php
    function array_prefix_values($prefix, $array)
    {
          $callback = create_function('$s','return "'.$prefix.'".$s;');
      return     array_map($callback,$array);
    }

    function     get_last_update()
    {
      if (     func_num_args() < 1 ) return 0;
          $dirs = func_get_args();
          $files = array();
      foreach (     $dirs as $dir )
      {
            $subfiles = scandir($dir);
            $subfiles = array_prefix_values($dir,$subfiles);
            $subfiles = array_filter($subfiles,"is_file");
            $files = array_merge($files,$subfiles);
      }
          $maxtimestamp = 0;
          $maxfilename = "";
      foreach (     $files as $file )
      {
            $timestamp = filemtime($file);
        if (     $timestamp > $maxtimestamp )
        {
              $maxtimestamp = $timestamp;
              $maxfilename = $file;
        }
      }
      return     date("Ymd",$maxtimestamp)." ($maxfilename)";
    }

    print     "last update: ".get_last_update("./lib/", "./css/", "./lang/");
    ?>

    OUTPUT:
    last update: 20110927 (./lang/sk.php)
    up
    -10
    timeflys at users dot sourceforget dot net
    21 years ago
    I found issues using getlastmod() to test whether or not I was successful in setting the Last Modified date in the header. The code below shows the same Last Modified date before and after I set the Last-Modified header.

    <?php
    //True modified date
    $modified = date ("F d Y H:i:s.", getlastmod());
       
    //artificial modified date - sent to header
    $last_modified = gmdate('D, d M Y H:i:s T', (time() - 43200));
        
    //caching prevention
    header("Last-Modified: $last_modified GMT");
    header("Cache-Control: no-store, no-cache, must-revalidate");  // HTTP/1.1
    header("Cache-Control: post-check=0, pre-check=0", false);
            header("Pragma: no-cache");                          // HTTP/1.0

    $getlast_modified = date ("F d Y H:i:s.", getlastmod());

    print     "True modified date(Before): $modified <p /> Date sent to header(After): $getlast_modified";
    ?>

    I then used the PEAR, HTTP_Request class which worked, the Last-Modified date updates everytime it is requested, the desired effect.

    <?php
    require 'HTTP/Request.php';
    $r = new HTTP_Request('http://www.sample.com/page.php');
    $r->sendRequest();
    $response_headers = $r->getResponseHeader();
    print     $response_headers["last-modified"];
    ?>
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