Category: apache

Prevent Files from being cached

Using php
<link href="/stylesheet.css?<?php echo time(); ?>" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="/site-script.js?<?php echo time(); ?>"></script>

// OR
<link href="/stylesheet.css?<?php echo filemtime('mycss.css'); ?>" rel="stylesheet" type="text/css" />

// OR
/**
 *  Given a file, /css/base.css, replaces it with a string containing the
 *  file's mtime, /css/base.1221534296.css.
 *  
 *  @param $file  The file to be loaded.  Must be an absolute path
 */
function auto_version($file)
{
  if(strpos($file, '/') !== 0 || !file_exists($_SERVER['DOCUMENT_ROOT'] . $file))
    return $file;

  $mtime = filemtime($_SERVER['DOCUMENT_ROOT'] . $file);
  return preg_replace('{\\.([^./]+)$}', ".$mtime.\$1", $file);
}

<link rel="stylesheet" href="/css/base.css" type="text/css" />




// OR


// OR
/**
 *  Given a file, /css/base.css, replaces it with a string containing the
 *  file's mtime, /css/base.1221534296.css.
 *  
 *  @param $file  The file to be loaded.  Must be an absolute path
 */
function auto_version($file)
{
  if(strpos($file, '/') !== 0 || !file_exists($_SERVER['DOCUMENT_ROOT'] . $file))
    return $file;

  $mtime = filemtime($_SERVER['DOCUMENT_ROOT'] . $file);
  return preg_replace('{\\.([^./]+)$}', ".$mtime.\$1", $file);
}
Using javascript
Using .htaccess


  FileETag None
    
      Header unset ETag
      Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
      Header set Pragma "no-cache"
      Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
Using GIT

/**
 * Get the hash of the current git HEAD
 * @param str $branch The git branch to check
 * @return mixed Either the hash or a boolean false
 */
public static function get_commit( $branch='master' ) {
  if ( $hash = file_get_contents( sprintf( '.git/refs/heads/%s', $branch ) ) ) {
    return $hash;
  } else {
    return time();
  }
}