function file_progress_implementation in Drupal 9

Same name and namespace in other branches

1. 8 core/modules/file/file.module \file_progress_implementation()
2. 7 modules/file/file.module \file_progress_implementation()

Determines the preferred upload progress implementation.

Return value

string|false A string indicating which upload progress system is available. Either "apc" or "uploadprogress". If neither are available, returns FALSE.

4 calls to file_progress_implementation()

FileWidget::settingsForm in core/modules/file/src/Plugin/Field/FieldWidget/FileWidget.php

Returns a form to configure settings for the widget.

FileWidgetAjaxController::progress in core/modules/file/src/Controller/FileWidgetAjaxController.php

Returns the progress status for a file upload process.

file_requirements in core/modules/file/file.install

Implements hook_requirements().

ManagedFile::processManagedFile in core/modules/file/src/Element/ManagedFile.php

Render API callback: Expands the managed_file element type.

File

core/modules/file/file.module, line 1160

Defines a "managed_file" Form API field and a "file" field for Field module.

Code

function file_progress_implementation() {
  static $implementation;
  if (!isset($implementation)) {
    $implementation = FALSE;

    // We prefer the PECL extension uploadprogress because it supports multiple
    // simultaneous uploads. APCu only supports one at a time.
    if (extension_loaded('uploadprogress')) {
      $implementation = 'uploadprogress';
    }
  }
  return $implementation;
}