function drupal_tempnam

Creates a file with a unique filename in the specified directory.

PHP's tempnam() does not return a URI like we want. This function will return a URI if given a URI, or it will return a filepath if given a filepath.

Compatibility: normal paths and stream wrappers.


$directory: The directory where the temporary filename will be created.

$prefix: The prefix of the generated temporary filename. Note: Windows uses only the first three characters of prefix.

Return value

The new temporary filename, or FALSE on failure.

See also


Related topics

6 calls to drupal_tempnam()
file_unmanaged_save_data in drupal/includes/
Saves a string to the specified destination without invoking file API.
image_gd_save in drupal/modules/system/
GD helper to write an image resource to a destination file.
LocaleExportFunctionalTest::testExportTranslation in drupal/modules/locale/locale.test
Test exportation of translations.
LocaleImportFunctionalTest::importPoFile in drupal/modules/locale/locale.test
Helper function: import a standalone .po file in a given language.
LocalePluralFormatTest::importPoFile in drupal/modules/locale/locale.test
Imports a standalone .po file in a given language.

... See full list


drupal/includes/, line 2498
API for handling file uploads and server file management.


function drupal_tempnam($directory, $prefix) {
  $scheme = file_uri_scheme($directory);
  if ($scheme && file_stream_wrapper_valid_scheme($scheme)) {
    $wrapper = file_stream_wrapper_get_instance_by_scheme($scheme);
    if ($filename = tempnam($wrapper
      ->getDirectoryPath(), $prefix)) {
      return $scheme . '://' . drupal_basename($filename);
    else {
      return FALSE;
  else {

    // Handle as a normal tempnam() call.
    return tempnam($directory, $prefix);