Function for taking MySQL Backup in PHP

Here is the function for taking backup of a MySQL database without any external tool for MySQL.

$host ---> Hostname
$user ----> Username
$pass ----> Password
$name ----> Database name
If we need the total database, just put the value of $tables as * or else pass only the tables you want with comma separated.

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";
 }
$s_file = 'db-backup-'.time().'-'.'.sql';
 //save file
 $handle = fopen($s_file,'w+');
 fwrite($handle,$return);
 fclose($handle);
 header("Location:".$s_file);
 exit;
}