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  1. if(filemtime('myfile.txt') > $result_set['filemtime']) {
  2.     // file was modified
  3. }
  4.      
  5. $modifiedTs = filemtime($filename);
  6. if ($modifiedTs != $lastModificationTs){
  7.   echo "$filename was modified!";
  8. }
  9.      
  10. class ApplicationLogger {
  11.  
  12.     private $logfile, $path;
  13.  
  14.     public function __construct() {
  15.         $this->logfile  = 'error.log';
  16.         $this->path  = '/var/log/apache2/';
  17.     }
  18.  
  19.     public function logState() {
  20.         $files = array(
  21.             'target'  => $this->path . $this->logfile,
  22.             'lastmod' => $this->path . $this->logfile . '_lastmod'
  23.         );
  24.  
  25.         if (file_exists($files['lastmod']) && file_exists($files['target'])) {
  26.             $lfh = fopen($files['lastmod'], 'r');
  27.             while (!feof($lfh)) {
  28.                 $lines[] = fgets($lfh);
  29.             }
  30.             fclose($lfh);
  31.         }
  32.  
  33.         $modified = false;
  34.  
  35.         /**
  36.          * check if we have a matching hash.
  37.          */
  38.         if (isset($lines) && filemtime($files['target']) != $lines[0]) { // mod time mismatch
  39.             if (md5_file($files['target']) != $lines[1]) { // content modified
  40.                 $modified = true;
  41.             }
  42.         }
  43.  
  44.         /**
  45.          * update or create the lastmod file
  46.          */
  47.         if (!file_exists($files['lastmod']) || $modified) {
  48.  
  49.             $current_mod = filemtime($files['target']) . "n" . md5_file($files['target']);
  50.  
  51.             file_put_contents($files['lastmod'], $current_mod);
  52.             $modified = true;
  53.         }
  54.  
  55.         return $modified;
  56.     }
  57. }
  58.      
  59. $mod = new ApplicationLogger();
  60. if ($mod->logState()) {
  61.     // changed do something
  62. }
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