function dump($export_file_location, $table_prefix = '')
{
$command = 'mysqldump' . ' -u ' . escapeshellarg($this->db->username) . ' --password='******' --add-drop-table ' . escapeshellarg($this->db->name);
if (null !== $this->db->port) {
$command .= ' -h ' . escapeshellarg($this->db->host) . ' --port=' . escapeshellarg($this->db->port);
} elseif (null !== $this->db->socket) {
$command .= ' --socket=' . escapeshellarg($this->db->socket);
}
$include_all_tables = empty($table_prefix) && empty($this->include_tables) && empty($this->exclude_tables);
if (!$include_all_tables) {
$tables = $this->get_tables($table_prefix);
$command .= ' ' . implode(' ', array_map('escapeshellarg', $tables));
}
$error_file = tempnam(sys_get_temp_dir(), 'err');
$command .= ' 2> ' . escapeshellarg($error_file);
if (DumpFile::is_gzip($export_file_location)) {
$command .= ' | gzip';
}
$command .= ' > ' . escapeshellarg($export_file_location);
exec($command, $output, $return_val);
if (0 !== $return_val) {
$error_text = file_get_contents($error_file);
@unlink($error_file);
$this->job->log(sprintf(__('Couldn\'t export database: %s', 'my-wp-backup'), $error_text), 'error');
}
@unlink($error_file);
}