public function FileSystem::createFilename in Drupal 10

Same name and namespace in other branches

1. 8 core/lib/Drupal/Core/File/FileSystem.php \Drupal\Core\File\FileSystem::createFilename()
2. 9 core/lib/Drupal/Core/File/FileSystem.php \Drupal\Core\File\FileSystem::createFilename()

File

core/lib/Drupal/Core/File/FileSystem.php, line 582

Class

FileSystem

Provides helpers to operate on files and stream wrappers.

Namespace

Drupal\Core\File

Code

public function createFilename($basename, $directory) {
  $original = $basename;

  // Strip control characters (ASCII value < 32). Though these are allowed in
  // some filesystems, not many applications handle them well.
  $basename = preg_replace('/[\\x00-\\x1F]/u', '_', $basename);
  if (preg_last_error() !== PREG_NO_ERROR) {
    throw new FileException(sprintf("Invalid filename '%s'", $original));
  }
  if (substr(PHP_OS, 0, 3) == 'WIN') {

    // These characters are not allowed in Windows filenames.
    $basename = str_replace([
      ':',
      '*',
      '?',
      '"',
      '<',
      '>',
      '|',
    ], '_', $basename);
  }

  // A URI or path may already have a trailing slash or look like "public://".
  if (substr($directory, -1) == '/') {
    $separator = '';
  }
  else {
    $separator = '/';
  }
  $destination = $directory . $separator . $basename;
  if (file_exists($destination)) {

    // Destination file already exists, generate an alternative.
    $pos = strrpos($basename, '.');
    if ($pos !== FALSE) {
      $name = substr($basename, 0, $pos);
      $ext = substr($basename, $pos);
    }
    else {
      $name = $basename;
      $ext = '';
    }
    $counter = 0;
    do {
      $destination = $directory . $separator . $name . '_' . $counter++ . $ext;
    } while (file_exists($destination));
  }
  return $destination;
}