Tips, on files

Knowing the size of a file (in KB)

To know the size of a file, you have to use the filesize function. Coupled with a small division by 1024, the function we will return the file size in kilobytes.

  $file = "Myfile.extention";
  if(file_exists($file)) {
    echo round(filesize($file)/1024);
  }
  

Count the number of lines of a file

To count the number of lines of a file, you have to use count statement:

    $file = "myfile.txt";
    if(file_exists($file)) {
      $tab = file($file); 
      echo count($tab);
    }
  

List the files in a directory in alphabetical order

To list the files in a directory in alphabetical order, use a table to sort. For that, one can use the small code:

    function alpha_sort($path) {
      // Table creation (to save files and folders)
      $files = array();
      $path = realpath($path) . DIRECTORY_SEPARATOR;
 
      if (is_dir($path)) {
         // Opening current path
        $handle = opendir($path);
        // List current files and directories
        while (($f = readdir($handle)) !== FALSE) {
            if ($f != '.' && $f != '..') {
                array_push($files, $f);
            }
        }
 
        // Close current directory
        closedir($handle);
         // Sort the table
        natsort($files);
      }
 
      return $files;
    }
 
    // display sorted files and folders of current directory
    foreach(alpha_sort('.') as $f) {
      echo $f . '<br />';
    }
  

Knowing the date of last modification of a file

For that, you have to use instruction:

    echo date ("Y/m/d H:i", filemtime("myfile.txt");