database_backup.php

<?php
//MySQL server and database
$dbhost = 'localhost';
$dbuser = 'waqas';
$dbpass = 'ahmad';
$dbname = 'chitor_db';
$tables = '*';

//Call the core function
backup_tables($dbhost, $dbuser, $dbpass, $dbname, $tables);

//Core function
function backup_tables($host, $user, $pass, $dbname, $tables = '*') {
    $link = mysqli_connect($host, $user, $pass, $dbname);

    // Check connection
    if (mysqli_connect_errno()) {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
        exit;
    }

    mysqli_query($link, "SET NAMES 'utf8'");

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

    $return = '';
    //cycle through
    foreach ($tables as $table) {
        $result = mysqli_query($link, 'SELECT * FROM '.$table);
        $num_fields = mysqli_num_fields($result);
        $num_rows = mysqli_num_rows($result);

        $return.= 'DROP TABLE IF EXISTS '.$table.';';
        $row2 = mysqli_fetch_row(mysqli_query($link, 'SHOW CREATE TABLE '.$table));
        $return.= "\n\n".$row2[1].";\n\n";
        $counter = 1;

        //Over tables
        for ($i = 0; $i < $num_fields; $i++) {   //Over rows
            while ($row = mysqli_fetch_row($result)) {   
                if ($counter == 1) {
                    $return.= 'INSERT INTO '.$table.' VALUES(';
                } else {
                    $return.= '(';
                }

                //Over fields
                for ($j=0; $j<$num_fields; $j++) {
                    $row[$j] = addslashes($row[$j]);
                    $row[$j] = str_replace("\n", "\\n", $row[$j]);
                    if (isset($row[$j])) { 
                        $return.= '"'.$row[$j].'"' ; 
                    } else { 
                        $return.= '""'; 
                    }
                    if ($j<($num_fields-1)) { 
                        $return.= ','; 
                    }
                }

                if ($num_rows == $counter) {
                    $return.= ");\n";
                } else {
                    $return.= "),\n";
                }
                ++$counter;
            }
        }
        $return.="\n\n\n";
    }

    //save file
    $fileName = 'db-backup-'.time().'-'.(md5(implode(',', $tables))).'.sql';
    $handle = fopen($fileName, 'w+');
    fwrite($handle, $return);
    if (fclose($handle)) {
        echo "Done, the file name is: ".$fileName;
        exit; 
    }
}