file_delete($fid)
Deletes a file and its database record.
Instead of directly deleting a file, it is strongly recommended to delete file usages instead. That will automatically mark the file as temporary and remove it during cleanup.
$fid: The file id.
\Drupal\file\FileUsage\FileUsageBase::delete()
function file_delete($fid) { return file_delete_multiple(array($fid)); }
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https://api.drupal.org/api/drupal/core!includes!file.inc/function/file_delete/8.1.x