I got this tutorial from the Internet. But I don't even have a basic understanding on how backup of a MySQL database through PHP would work.
Using PHP to Backup MySQL Databases
Can you recommend some sites that I can use as a reference so that I can study it?
Based on the good solution that provided by tazo todua, I've made some of changes since mysql_connect has deprecated and not supported in new php version. I've used mysqli_connect instead and increased the performance of inserting values to the database:
<?php
/**
* Updated: Mohammad M. AlBanna
* Website: MBanna.info
*/
//MySQL server and database
$dbhost = 'localhost';
$dbuser = 'my_user';
$dbpass = 'my_pwd';
$dbname = 'database_name';
$tables = '*';
//Call the core function
backup_tables($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;
}
}
Try out following example of using SELECT INTO OUTFILE query for creating table backup. This will only backup a particular table.
<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn ) {
die('Could not connect: ' . mysql_error());
}
$table_name = "employee";
$backup_file = "/tmp/employee.sql";
$sql = "SELECT * INTO OUTFILE '$backup_file' FROM $table_name";
mysql_select_db('test_db');
$retval = mysql_query( $sql, $conn );
if(! $retval ) {
die('Could not take data backup: ' . mysql_error());
}
echo "Backedup data successfully\n";
mysql_close($conn);
?>
for using Cron Job, below is the php function
public function runback() {
$filename = '/var/www/html/local/storage/stores/database_backup_' . date("Y-m-d-H-i-s") . '.sql';
/*
* db backup
*/
$command = "mysqldump --single-transaction -h $dbhost -u$dbuser -p$dbpass yourdb_name > $filename";
system($command);
if ($command == '') {
/* no output is good */
echo 'not done';
} else {
/* we have something to log the output here */
echo 'done';
}
}
There should not be any space between -u and username also no space between -p and password. CRON JOB command to run this script every sunday 8.30 am:
>> crontab -e
30 8 * * 7 curl -k https://www.websitename.com/takebackup
While you can execute backup commands from PHP, they don't really have anything to do with PHP. It's all about MySQL.
I'd suggest using the mysqldump utility to back up your database. The documentation can be found here : http://dev.mysql.com/doc/refman/5.1/en/mysqldump.html.
The basic usage of mysqldump is
mysqldump -u user_name -p name-of-database >file_to_write_to.sql
You can then restore the backup with a command like
mysql -u user_name -p <file_to_read_from.sql
Do you have access to cron? I'd suggest making a PHP script that runs mysqldump as a cron job. That would be something like
<?php
$filename='database_backup_'.date('G_a_m_d_y').'.sql';
$result=exec('mysqldump database_name --password=your_pass --user=root --single-transaction >/var/backups/'.$filename,$output);
if(empty($output)){/* no output is good */}
else {/* we have something to log the output here*/}
If mysqldump is not available, the article describes another method, using the SELECT INTO OUTFILE and LOAD DATA INFILE commands. The only connection to PHP is that you're using PHP to connect to the database and execute the SQL commands. You could also do this from the command line MySQL program, the MySQL monitor.
It's pretty simple, you're writing an SQL file with one command, and loading/executing it when it's time to restore.
You can find the docs for select into outfile here (just search the page for outfile). LOAD DATA INFILE is essentially the reverse of this. See here for the docs.
If you want to backup a database from php script you could use a class for example lets call it MySQL. This class will use PDO (build in php class which will handle the connection to the database). This class could look like this:
<?php /*defined in your exampleconfig.php*/
define('DBUSER','root');
define('DBPASS','');
define('SERVERHOST','localhost');
?>
<?php /*defined in examplemyclass.php*/
class MySql{
private $dbc;
private $user;
private $pass;
private $dbname;
private $host;
function __construct($host="localhost", $dbname="your_databse_name_here", $user="your_username", $pass="your_password"){
$this->user = $user;
$this->pass = $pass;
$this->dbname = $dbname;
$this->host = $host;
$opt = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
);
try{
$this->dbc = new PDO('mysql:host='.$this->host.';dbname='.$this->dbname.';charset=utf8', $user, $pass, $opt);
}
catch(PDOException $e){
echo $e->getMessage();
echo "There was a problem with connection to db check credenctials";
}
} /*end function*/
public function backup_tables($tables = '*'){ /* backup the db OR just a table */
$host=$this->host;
$user=$this->user;
$pass=$this->pass;
$dbname=$this->dbname;
$data = "";
//get all of the tables
if($tables == '*')
{
$tables = array();
$result = $this->dbc->prepare('SHOW TABLES');
$result->execute();
while($row = $result->fetch(PDO::FETCH_NUM))
{
$tables[] = $row[0];
}
}
else
{
$tables = is_array($tables) ? $tables : explode(',',$tables);
}
//cycle through
foreach($tables as $table)
{
$resultcount = $this->dbc->prepare('SELECT count(*) FROM '.$table);
$resultcount->execute();
$num_fields = $resultcount->fetch(PDO::FETCH_NUM);
$num_fields = $num_fields[0];
$result = $this->dbc->prepare('SELECT * FROM '.$table);
$result->execute();
$data.= 'DROP TABLE '.$table.';';
$result2 = $this->dbc->prepare('SHOW CREATE TABLE '.$table);
$result2->execute();
$row2 = $result2->fetch(PDO::FETCH_NUM);
$data.= "\n\n".$row2[1].";\n\n";
for ($i = 0; $i < $num_fields; $i++)
{
while($row = $result->fetch(PDO::FETCH_NUM))
{
$data.= 'INSERT INTO '.$table.' VALUES(';
for($j=0; $j<$num_fields; $j++)
{
$row[$j] = addslashes($row[$j]);
$row[$j] = str_replace("\n","\\n",$row[$j]);
if (isset($row[$j])) { $data.= '"'.$row[$j].'"' ; } else { $data.= '""'; }
if ($j<($num_fields-1)) { $data.= ','; }
}
$data.= ");\n";
}
}
$data.="\n\n\n";
}
//save filename
$filename = 'db-backup-'.time().'-'.(implode(",",$tables)).'.sql';
$this->writeUTF8filename($filename,$data);
/*USE EXAMPLE
$connection = new MySql(SERVERHOST,"your_db_name",DBUSER, DBPASS);
$connection->backup_tables(); //OR backup_tables("posts");
$connection->closeConnection();
*/
} /*end function*/
private function writeUTF8filename($filenamename,$content){ /* save as utf8 encoding */
$f=fopen($filenamename,"w+");
# Now UTF-8 - Add byte order mark
fwrite($f, pack("CCC",0xef,0xbb,0xbf));
fwrite($f,$content);
fclose($f);
/*USE EXAMPLE this is only used by public function above...
$this->writeUTF8filename($filename,$data);
*/
} /*end function*/
public function recoverDB($file_to_load){
echo "write some code to load and proccedd .sql file in here ...";
/*USE EXAMPLE this is only used by public function above...
recoverDB("some_buck_up_file.sql");
*/
} /*end function*/
public function closeConnection(){
$this->dbc = null;
//EXAMPLE OF USE
/*$connection->closeConnection();*/
}/*end function*/
} /*END OF CLASS*/
?>
Now you could simply use this in your backup.php:
include ('config.php');
include ('myclass.php');
$connection = new MySql(SERVERHOST,"your_databse_name_here",DBUSER, DBPASS);
$connection->backup_tables(); /*Save all tables and it values in selected database*/
$connection->backup_tables("post_table"); /*Saves only table name posts_table from selected database*/
$connection->closeConnection();
Which means that visiting this page will result in backing up your file... of course it doesn't have to be that way :) you can call this method on every post to your database to be up to date all the time, however, I would recommend to write it to one file at all the time instead of creating new files with time()... as it is above.
Hope it helps and good luck ! :>
try this 100% working.
<?php
function dbbackup($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("host", "user", "password", "database" );
?>
Take a look here! It is a native solution written in php. You won't need to exec mysqldump, or cope with incomplete scripts. This is a full mysqldump clone, without dependencies, output compression and sane defaults.
Out of the box, mysqldump-php supports backing up table structures, the data itself, views, triggers and events.
MySQLDump-PHP is the only library that supports:
You can install it using composer, or just download the php file, and it is as easy as doing:
use Ifsnop\Mysqldump as IMysqldump;
try {
$dump = new IMysqldump\Mysqldump('database', 'username', 'password');
$dump->start('storage/work/dump.sql');
} catch (\Exception $e) {
echo 'mysqldump-php error: ' . $e->getMessage();
}
All the options are explained at the github page, but more or less are auto-explicative:
$dumpSettingsDefault = array(
'include-tables' => array(),
'exclude-tables' => array(),
'compress' => Mysqldump::NONE,
'init_commands' => array(),
'no-data' => array(),
'reset-auto-increment' => false,
'add-drop-database' => false,
'add-drop-table' => false,
'add-drop-trigger' => true,
'add-locks' => true,
'complete-insert' => false,
'databases' => false,
'default-character-set' => Mysqldump::UTF8,
'disable-keys' => true,
'extended-insert' => true,
'events' => false,
'hex-blob' => true, /* faster than escaped content */
'net_buffer_length' => self::MAXLINESIZE,
'no-autocommit' => true,
'no-create-info' => false,
'lock-tables' => true,
'routines' => false,
'single-transaction' => true,
'skip-triggers' => false,
'skip-tz-utc' => false,
'skip-comments' => false,
'skip-dump-date' => false,
'skip-definer' => false,
'where' => '',
/* deprecated */
'disable-foreign-keys-check' => true
);
A solution to take the backup of your Database in "dbBackup" Folder / Directory
<?php
error_reporting(E_ALL);
/* Define database parameters here */
define("DB_USER", 'root');
define("DB_PASSWORD", 'root');
define("DB_NAME", 'YOUR_DATABASE_NAME');
define("DB_HOST", 'localhost');
define("OUTPUT_DIR", 'dbBackup'); // Folder Path / Directory Name
define("TABLES", '*');
/* Instantiate Backup_Database and perform backup */
$backupDatabase = new Backup_Database(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
$status = $backupDatabase->backupTables(TABLES, OUTPUT_DIR) ? 'OK' : 'KO';
echo "Backup result: " . $status;
/* The Backup_Database class */
class Backup_Database {
private $conn;
/* Constructor initializes database */
function __construct( $host, $username, $passwd, $dbName, $charset = 'utf8' ) {
$this->dbName = $dbName;
$this->connectDatabase( $host, $username, $passwd, $charset );
}
protected function connectDatabase( $host, $username, $passwd, $charset ) {
$this->conn = mysqli_connect( $host, $username, $passwd, $this->dbName);
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit();
}
/* change character set to $charset Ex : "utf8" */
if (!mysqli_set_charset($this->conn, $charset)) {
printf("Error loading character set ".$charset.": %s\n", mysqli_error($this->conn));
exit();
}
}
/* Backup the whole database or just some tables Use '*' for whole database or 'table1 table2 table3...' @param string $tables */
public function backupTables($tables = '*', $outputDir = '.') {
try {
/* Tables to export */
if ($tables == '*') {
$tables = array();
$result = mysqli_query( $this->conn, 'SHOW TABLES' );
while ( $row = mysqli_fetch_row($result) ) {
$tables[] = $row[0];
}
} else {
$tables = is_array($tables) ? $tables : explode(',', $tables);
}
$sql = 'CREATE DATABASE IF NOT EXISTS ' . $this->dbName . ";\n\n";
$sql .= 'USE ' . $this->dbName . ";\n\n";
/* Iterate tables */
foreach ($tables as $table) {
echo "Backing up " . $table . " table...";
$result = mysqli_query( $this->conn, 'SELECT * FROM ' . $table );
// Return the number of fields in result set
$numFields = mysqli_num_fields($result);
$sql .= 'DROP TABLE IF EXISTS ' . $table . ';';
$row2 = mysqli_fetch_row( mysqli_query( $this->conn, 'SHOW CREATE TABLE ' . $table ) );
$sql.= "\n\n" . $row2[1] . ";\n\n";
for ($i = 0; $i < $numFields; $i++) {
while ($row = mysqli_fetch_row($result)) {
$sql .= 'INSERT INTO ' . $table . ' VALUES(';
for ($j = 0; $j < $numFields; $j++) {
$row[$j] = addslashes($row[$j]);
// $row[$j] = ereg_replace("\n", "\\n", $row[$j]);
if (isset($row[$j])) {
$sql .= '"' . $row[$j] . '"';
} else {
$sql.= '""';
}
if ($j < ($numFields - 1)) {
$sql .= ',';
}
}
$sql.= ");\n";
}
} // End :: for loop
mysqli_free_result($result); // Free result set
$sql.="\n\n\n";
echo " OK <br/>" . "";
}
} catch (Exception $e) {
var_dump($e->getMessage());
return false;
}
return $this->saveFile($sql, $outputDir);
}
/* Save SQL to file @param string $sql */
protected function saveFile(&$sql, $outputDir = '.') {
if (!$sql)
return false;
try {
$handle = fopen($outputDir . '/db-backup-' . $this->dbName . '-' . date("Ymd-His", time()) . '.sql', 'w+');
fwrite($handle, $sql);
fclose($handle);
mysqli_close( $this->conn );
} catch (Exception $e) {
var_dump($e->getMessage());
return false;
}
return true;
}
} // End :: class Backup_Database
?>
EXPORT_DATABASE("localhost", "user", "pass", "db_name" );
updated function code at github.
From the answer of @DevWL, I got "Undefined offset ..." at
if ($j<($num_fields-1)) { $data.= ','; }
I made some changes to:
class DBbackup {
public $suffix;
public $dirs;
protected $dbInstance;
public function __construct() {
try{
$this->dbInstance = new PDO("mysql:host=".$dbhost.";dbname=".$dbname,
$username, $password);
} catch(Exception $e) {
die("Error ".$e->getMessage());
}
$this->suffix = date('Ymd_His');
}
public function backup($tables = '*'){
$output = "-- database backup - ".date('Y-m-d H:i:s').PHP_EOL;
$output .= "SET NAMES utf8;".PHP_EOL;
$output .= "SET sql_mode = 'NO_AUTO_VALUE_ON_ZERO';".PHP_EOL;
$output .= "SET foreign_key_checks = 0;".PHP_EOL;
$output .= "SET AUTOCOMMIT = 0;".PHP_EOL;
$output .= "START TRANSACTION;".PHP_EOL;
//get all table names
if($tables == '*') {
$tables = [];
$query = $this->dbInstance->prepare('SHOW TABLES');
$query->execute();
while($row = $query->fetch(PDO::FETCH_NUM)) {
$tables[] = $row[0];
}
$query->closeCursor();
}
else {
$tables = is_array($tables) ? $tables : explode(',',$tables);
}
foreach($tables as $table) {
$query = $this->dbInstance->prepare("SELECT * FROM `$table`");
$query->execute();
$output .= "DROP TABLE IF EXISTS `$table`;".PHP_EOL;
$query2 = $this->dbInstance->prepare("SHOW CREATE TABLE `$table`");
$query2->execute();
$row2 = $query2->fetch(PDO::FETCH_NUM);
$query2->closeCursor();
$output .= PHP_EOL.$row2[1].";".PHP_EOL;
while($row = $query->fetch(PDO::FETCH_NUM)) {
$output .= "INSERT INTO `$table` VALUES(";
for($j=0; $j<count($row); $j++) {
$row[$j] = addslashes($row[$j]);
$row[$j] = str_replace("\n","\\n",$row[$j]);
if (isset($row[$j]))
$output .= "'".$row[$j]."'";
else $output .= "''";
if ($j<(count($row)-1))
$output .= ',';
}
$output .= ");".PHP_EOL;
}
}
$output .= PHP_EOL.PHP_EOL;
$output .= "COMMIT;";
//save filename
$filename = 'db_backup_'.$this->suffix.'.sql';
$this->writeUTF8filename($filename,$output);
}
private function writeUTF8filename($fn,$c){ /* save as utf8 encoding */
$f=fopen($fn,"w+");
# Now UTF-8 - Add byte order mark
fwrite($f, pack("CCC",0xef,0xbb,0xbf));
fwrite($f,$c);
fclose($f);
}
}
And usage example:
$Backup = new DBbackup();
$Backup->backup();
This works great on MySQL 10.1.34-MariaDB , PHP : 7.2.7
Here is a pure PHP class to perform backups on MySQL databases not using mysqldump or mysql commands: Backing up MySQL databases with pure PHP
@T.Todua's answer.
It's cool. However, it failed to backup my database correctly. Hence, I've modified it.
Please use like so: Backup_Mysql_Db::init("localhost","user","pass","db_name","/usr/var/output_dir" );
Thank you.
<?php
/**========================================================+
* +
* Static class with functions for backing up database. +
* +
* PHP Version 5.6.31 +
*=========================================================+*/
class Backup_Mysql_Db
{
private function __construct() {}
/**Initializes the database backup
* @param String $host mysql hostname
* @param String $user mysql user
* @param String $pass mysql password
* @param String $name name of database
* @param String $outputDir the path to the output directory for storing the backup file
* @param Array $tables (optional) to backup specific tables only,like: array("mytable1","mytable2",...)
* @param String $backup_name (optional) backup filename (otherwise, it creates random name)
* EXAMPLE: Backup_Mysql_Db::init("localhost","user","pass","db_name","/usr/var/output_dir" );
*/
public static function init($host,$user,$pass,$name, $outputDir, $tables=false, $backup_name=false)
{
set_time_limit(3000);
$mysqli = new mysqli($host,$user,$pass,$name);
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
//change database to $name
$mysqli->select_db($name);
/* change character set to utf8 */
if (!$mysqli->set_charset("utf8"))
{
printf("Error loading character set utf8: %s\n", $mysqli->error);
exit();
}
//list all tables in the database
$queryTables = $mysqli->query('SHOW TABLES');
while($row = $queryTables->fetch_row())
{
$target_tables[] = $row[0];
}
//if user opted to backup specific tables only
if($tables !== false)
{
$target_tables = array_intersect( $target_tables, $tables);
}
date_default_timezone_set('Africa/Accra');//set your timezone
//$content is the text data to be written to the file for backup
$content = "-- phpMyAdmin SQL Dump\r\n-- version 4.7.4". //insert your phpMyAdmin version
"\r\n-- https://www.phpmyadmin.net/\r\n--\r\n-- Host: ".$host.
"\r\n-- Generation Time: ".date('M d, Y \a\t h:i A',strtotime(date('Y-m-d H:i:s', time()))).
"\r\n-- Server version: ".$mysqli->server_info.
"\r\n-- PHP Version: ". phpversion();
$content .= "\r\n\r\nSET SQL_MODE = \"NO_AUTO_VALUE_ON_ZERO\";\r\nSET AUTOCOMMIT = 0;\r\nSTART TRANSACTION;\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 utf8mb4 */;\r\n\r\n--\r\n-- Database: `".
$name."`\r\n--\r\nCREATE DATABASE IF NOT EXISTS `".
$name."` DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci;\r\nUSE `".
$name."`;";
//traverse through every table in the database
foreach($target_tables as $table)
{
if (empty($table)){ continue; }
$result = $mysqli->query('SELECT * FROM `'.$table.'`');
//get the number of columns
$fields_amount=$result->field_count;
//get the number of affected rows in the MySQL operation
$rows_num=$mysqli->affected_rows;
//Retrieve the Table Definition of the existing table
$res = $mysqli->query('SHOW CREATE TABLE '.$table);
$TableMLine=$res->fetch_row();
$content .= "\r\n\r\n-- --------------------------------------------------------\r\n\r\n"."--\r\n-- Table structure for table `".$table."`\r\n--\r\n\r\n";
//if the table is not empty
if(!self::table_is_empty($table,$mysqli))
{ $content .= $TableMLine[1].";\n\n";//append the Table Definition
//replace, case insensitively
$content =str_ireplace("CREATE TABLE `".$table."`",//wherever you find this
"DROP TABLE IF EXISTS `".$table."`;\r\nCREATE TABLE IF NOT EXISTS `".$table."`",//replace with that
$content);//in this
$content .= "--\r\n-- Dumping data for table `".$table."`\r\n--\r\n";
$content .= "\nINSERT INTO `".$table."` (".self::get_columns_from_table($table, $mysqli)." ) VALUES\r\n".self::get_values_from_table($table,$mysqli);
}
else//otherwise if the table is empty
{
$content .= $TableMLine[1].";";
//replace, case insensitively
$content =str_ireplace("CREATE TABLE `".$table."`",//wherever you find this
"DROP TABLE IF EXISTS `".$table."`;\r\nCREATE TABLE IF NOT EXISTS `".$table."`",//replace with that
$content);//in this
}
}
$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 */;";
date_default_timezone_set('Africa/Accra');
//format the time at this very moment and get rid of the colon ( windows doesn't allow colons in filenames)
$date = str_replace(":", "-", date('jS M, y. h:i:s A.',strtotime(date('Y-m-d H:i:s', time()))));
//if there's a backup name, use it , otherwise device one
$backup_name = $backup_name ? $backup_name : $name.'___('.$date.').sql';
//Get current buffer contents and delete current output buffer
ob_get_clean();
self::saveFile($content, $backup_name, $outputDir);
exit;
}
/** Save data to file.
* @param String $data The text data to be stored in the file
* @param String $backup_name The name of the backup file
* @param String $outputDir (optional) The directory to save the file to.
* If unspecified, will save in the current directory.
* */
private static function saveFile(&$data,$backup_name, $outputDir = '.')
{
if (!$data)
{
return false;
}
try
{
$handle = fopen($outputDir . '/'. $backup_name , 'w+');
fwrite($handle, $data);
fclose($handle);
} catch (Exception $e)
{
var_dump($e->getMessage());
return false;
}
return true;
}
/**Checks if table is empty
* @param String $table table in mysql database
* @return Boolean true if table is empty, false otherwise
*/
private static function table_is_empty($table,$mysqli)
{
$sql = "SELECT * FROM $table";
$result = mysqli_query($mysqli, $sql);
if($result)
{
if(mysqli_num_rows($result) > 0)
{
return false;
}
else
{
return true;
}
}
return false;
}
/**Retrieves the columns in the table
* @param String $table table in mysql database
* @return String a list of all the columns in the right format
*/
private static function get_columns_from_table($table, $mysqli)
{
$column_header = "";
$result = mysqli_query($mysqli, "SHOW COLUMNS FROM $table");
while($row = $result->fetch_row())
{
$column_header .= "`".$row[0]."`, ";
}
//remove leading and trailing whitespace, and remove the last comma in the string
return rtrim(trim($column_header),',');
}
/**Retrieves the values in the table row by row in the table
* @param String $table table in mysql database
* @return String a list of all the values in the table in the right format
*/
private static function get_values_from_table($table, $mysqli)
{
$values = "";
$columns = [];
//get all the columns in the table
$result = mysqli_query($mysqli, "SHOW COLUMNS FROM $table");
while($row = $result->fetch_row())
{
array_push($columns,$row[0] );
}
$result1 = mysqli_query($mysqli, "SELECT * FROM $table");
//while traversing every row in the table(row by row)
while($row = mysqli_fetch_array($result1))
{ $values .= "(";
//get the values in each column
foreach($columns as $col)
{ //if the value is an Integer
$values .= (self::column_is_of_int_type($table, $col,$mysqli)?
$row["$col"].", "://do not surround it with single quotes
"'".$row["$col"]."', "); //otherwise, surround it with single quotes
}
$values = rtrim(trim($values),','). "),\r\n";
}
return rtrim(trim($values),',').";";
}
/**Checks if the data type in the column is an integer
* @param String $table table in mysql database
* @return Boolean true if it is an integer, false otherwise.
*/
private static function column_is_of_int_type($table, $column,$mysqli)
{
$q = mysqli_query($mysqli,"DESCRIBE $table");
while($row = mysqli_fetch_array($q))
{
if ($column === "{$row['Field']}")
{
if (strpos("{$row['Type']}", 'int') !== false)
{
return true;
}
}
}
return false;
}
}
Source: Stackoverflow.com