public FileSystemInterface::moveUploadedFile($filename, $uri)
Moves an uploaded file to a new location.
PHP's move_uploaded_file() does not properly support streams if open_basedir is enabled, so this function fills that gap.
Compatibility: normal paths and stream wrappers.
string $filename: The filename of the uploaded file.
string $uri: A string containing the destination URI of the file.
bool TRUE on success, or FALSE on failure.
https://www.drupal.org/node/515192
public function moveUploadedFile($filename, $uri);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!File!FileSystemInterface.php/function/FileSystemInterface::moveUploadedFile/8.1.x