backup_db.php

<?php
// https://github.com/tazotodua/useful-php-scripts 
				//optional: 5th parameter - backup specific tables only: array("mytable1","mytable2",...)   
				//optional: 6th parameter - backup filename
				// NOTE! to adequatelly replace strings in DB, MUST READ:  goo.gl/2fZDQL
function EXPORT_TABLES($host,$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";
		for ($i = 0, $st_counter = 0; $i < $fields_amount;   $i++, $st_counter=0) {
			while($row = $result->fetch_row())  { //when started (and every after 100 command cycle):
				if ($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.= ',';}   }        $content .=")";
				//every after 100 command cycle [or at last line] ....p.s. but should be inserted 1 cycle eariler
				if ( (($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 : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).".sql";
	ob_get_clean(); header('Content-Type: application/octet-stream');   header("Content-Transfer-Encoding: Binary"); header("Content-disposition: attachment; filename=\"".$backup_name."\"");
	echo $content; exit;
}      //see import.php too
EXPORT_TABLES('localhost','user','pass','db_name');
?>