Magento Database Backup Without phpmyadmin access

db_backup.php

<?php

error_reporting(E_ALL ^ E_NOTICE);
ini_set('display_errors', 1);
ini_set('memory_limit', '512M');

// Get Magento Application
require_once 'app/Mage.php';
       Mage::app('default');

// get Magento config
$config  = Mage::getConfig()->getResourceConnectionConfig("default_setup");

$dbinfo = array(
	'host' => $config->host,
   	'user' => $config->username,
    'pass' => $config->password,
    'dbname' => $config->dbname
);


// Database Config
$db_host = $dbinfo[“host”];
$db_user = $dbinfo[“user”];
$db_pass = $dbinfo[“pass”];
$db_name = $dbinfo[“dbname”];



// filename 
$backup_file = $db_name ."-". date("Y-m-d-H-i-s") . ".gz";

$command = "mysqldump --database " . $db_name  . " -u ". $db_user  . " -p'". $db_pass . "' | gzip > " . $backup_file;

echo 'command executing is ' . $command . '<br/>' ;

$output = shell_exec($command);

echo 'Finished!<br/>' ;