Database Backup using php

Export Db backup
error_reporting(E_ALL & ~E_NOTICE);

$hostname="localhost";
$username="root";
$password="";
$dbname="testdb";


backup_tables($hosthost,$username,$password,$dbname);


function backup_tables($host,$user,$pass,$name,$tables = '*')
{

$link = mysql_connect($host,$user,$pass);
mysql_select_db($name,$link);

//get all of the tables
if($tables == '*')
{
$tables = array();
$result = mysql_query('SHOW TABLES');
while($row = mysql_fetch_row($result))
{
$tables[] = $row[0];
}
}
else
{
$tables = is_array($tables) ? $tables : explode(',',$tables);
}


foreach($tables as $table)
{
$result = mysql_query('SELECT * FROM '.$table);
$n_fields = mysql_num_fields($result);


$row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table));
$return.= "\n\n".$row2[1].";\n\n";

for ($i = 0; $i < $n_fields; $i++)
{
while($row = mysql_fetch_row($result))
{
$return.= 'INSERT INTO '.$table.' VALUES(';
for($j=0; $j<$n_fields; $j++)
{
$row[$j] = addslashes($row[$j]);
$row[$j] = ereg_replace("\n","\\n",$row[$j]);
if (isset($row[$j])) { $return.= '"'.$row[$j].'"' ; } else { $return.= '""'; }
if ($j<($n_fields-1)) { $return.= ','; }
}
$return.= ");\n";
}
}
$return.="\n\n\n";
}

//save file
$handle = fopen('db-backup-'.time().'.sql','w+');
//$handle = fopen('backup.sql','w+')or die('canot open');
fwrite($handle,$return);
fclose($handle);
echo "Backup Database Successfully";
}

?>


Import Db backup

$db="testing";
$link = mysql_connect('localhost','root','');
mysql_select_db($db,$link);

$sql = explode(';', file_get_contents ('backupdb.sql')); //Give filename.sql
$n = count ($sql) - 1;
for ($i = 0; $i < $n; $i++) {
$query = $sql[$i];
$result = mysql_query ($query)
or die ('

Query:
' . $query .
'
failed. MySQL error: ' . mysql_error());
}
//unlink('backupdb.sql');
?>