เกี่ยวกับการ backup mysql ครับ คือมีวิธี ในการเขียนโคด phpในการ backup mysql ไหมครับ แบบที่ไม่ต้องเข้าไปทำใน phpmyadmin

<?php
mysql_query("mysqldump -u root -p mydatabase > C:\db.sql");
?>

<?php
$host="localhost";
$user="root";
$pw="";
$dbname="car_db";

$result=mysql_query("mysqldump -u root -p car_db > C:\car_db.sql");

	if($result){
		echo"==backup ok";
	}else{
		echo"==no backup";
	}
?>

<?php 
$host="localhost"; 
$username="root"; 
$password="1234"; 
$dbname="db_project";  
$day=date("d-m-Y");
mysql_connect($host, $username, $password) or die("ไม่สามารถเชื่อมต่อฐานข้อมูลได้");
mysql_select_db($dbname) or die("ฐานข้อมูลไม่ถูกต้อง");
$sql = (" mysqldump -u root -p $dbname > D:\$dbname_$day.sql "); 
exec($sql);  
 
?>

<?php
$host="localhost";
$user="root";
$pw="x";
$dbname="tantip_db";

$day=date("d-m-Y");


$sql = ("C:\AppServ\MySQL\bin\mysqldump --host=$host --user=$user --password=$pw $dbname > D:/db.sql");
exec($sql); 
?>

<?php
backup_tables('localhost','root','1234','db_book');


/* backup the db OR just a table */
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);
	}
	
	//cycle through
	foreach($tables as $table)
	{
		$result = mysql_query('SELECT * FROM '.$table);
		$num_fields = mysql_num_fields($result);
		
		$return.= 'DROP TABLE '.$table.';';
		$row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table));
		$return.= "\n\n".$row2[1].";\n\n";
		
		for ($i = 0; $i < $num_fields; $i++) 
		{
			while($row = mysql_fetch_row($result))
			{
				$return.= 'INSERT INTO '.$table.' VALUES(';
				for($j=0; $j<$num_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<($num_fields-1)) { $return.= ','; }
				}
				$return.= ");\n";
			}
		}
		$return.="\n\n\n";
	}
	
	//save file
	$handle = fopen('db-backup-'.time().'-'.(md5(implode(',',$tables))).'.sql','w+');
	fwrite($handle,$return);
	fclose($handle);
}
?>