<?php
function dbbackup($host,$user,$pass,$name,$tables=false, $backup_name=false)
{ 
	set_time_limit(3000); 
	$mysqli = new mysqli($host,$user,$pass,$name); 
	$mysqli->select_db($name); 
	$mysqli->query("SET NAMES 'utf8'");
	$queryTables = $mysqli->query('SHOW TABLES'); 
	while($row = $queryTables->fetch_row()) 
	{ 
		$target_tables[] = $row[0]; 
	}	
	if($tables !== false) 
	{
		$target_tables = array_intersect( $target_tables, $tables); 
	} 
	$content = "SET SQL_MODE = \"NO_AUTO_VALUE_ON_ZERO\";\r\nSET time_zone = \"+00:00\";\r\n\r\n\r\n/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;\r\n/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;\r\n/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;\r\n/*!40101 SET NAMES utf8 */;\r\n--\r\n-- Database: `".$name."`\r\n--\r\n\r\n\r\n";
	foreach($target_tables as $table)
	{
		if (empty($table))
		{
			continue;
		} 
		$result	= $mysqli->query('SELECT * FROM `'.$table.'`');  	$fields_amount=$result->field_count;  $rows_num=$mysqli->affected_rows; 	$res = $mysqli->query('SHOW CREATE TABLE '.$table);	$TableMLine=$res->fetch_row(); 
		$content .= "\n\n".$TableMLine[1].";\n\n";   $TableMLine[1]=str_ireplace('CREATE TABLE `','CREATE TABLE IF NOT EXISTS `',$TableMLine[1]);
		for ($i = 0, $st_counter = 0; $i < $fields_amount;   $i++, $st_counter=0) 
		{
			while($row = $result->fetch_row())	
			{
				if ($st_counter%100 == 0 || $st_counter == 0 )	
				{
					$content .= "\nINSERT INTO ".$table." VALUES";
				}
				$content .= "\n(";    
				for($j=0; $j<$fields_amount; $j++)
				{
					$row[$j] = str_replace("\n","\\n", addslashes($row[$j]) ); 
					if (isset($row[$j]))
					{
						$content .= '"'.$row[$j].'"' ;
					} 
					else
					{
						$content .= '""';
					}
					if ($j<($fields_amount-1))
					{
						$content.= ',';
					}  
				}
				$content .=")";
				if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num) 
				{
					$content .= ";";
				}
				else
				{
					$content .= ",";
				}
				$st_counter=$st_counter+1;
			}
		} $content .="\n\n\n";
	}
	$content .= "\r\n\r\n/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;\r\n/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;\r\n/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;";
	$backup_name = $backup_name ? $backup_name : $name.'___('.date('H-i-s').'_'.date('d-m-Y').').sql';
	ob_get_clean(); 
	header('Content-Type: application/octet-stream'); 
	header("Content-Transfer-Encoding: Binary"); 
	header('Content-Length: '. (function_exists('mb_strlen') ? mb_strlen($content, '8bit'): strlen($content)) );   
	header("Content-disposition: attachment; filename=\"".$backup_name."\""); 
	echo $content; exit;
}
dbbackup("localhost", "root", "", "siva" );
//Header("Location:index.php");


?>