can i back up mysql database from php code?

<?php
   $dbhost = 'localhost:3036';
   $dbuser = 'root';
   $dbpass = 'rootpassword';
   
   $backup_file = $dbname . date("Y-m-d-H-i-s") . '.gz';
   $command = "mysqldump --opt -h $dbhost -u $dbuser -p $dbpass ". "test_db | gzip > $backup_file";
   
   system($command);
?><?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

$database = 'db';
$user = 'user';
$pass = 'pass';
$host = 'localhost';
$dir = dirname(__FILE__) . '/dump.sql';

echo "<h3>Backing up database to `<code>{$dir}</code>`</h3>";

exec("mysqldump --user={$user} --password={$pass} --host={$host} {$database} --result-file={$dir} 2>&1", $output);

var_dump($output);