function 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 1197

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;
}

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