使用php备份数据库mysql

Question

I found this code

Run mysqldump using system() function

The system() function is used to execute an external program. Because MySQL already have built in tool for creating MySQL database backup (mysqldump) let's use it from our PHP script

<?php
include 'config.php';
include 'opendb.php';

$backupFile = $dbname . date("Y-m-d-H-i-s") . '.gz';
$command = "mysqldump --opt -h $dbhost -u $dbuser -p $dbpass $dbname | gzip > $backupFile";
system($command);

include 'closedb.php';
?>

From HERE . It is on how to backup database. I want to back up my database on button click or every month depending on the need so i search for a tutorial i found one but it does not clearly say much like

1. Where can i find the backup file if it was created.
2. Do i need to save it as .sql file or it is saved as sql already
3. If saved as .sql where can i find it

UPDATE

I used

    $mysqldump=exec('which mysqldump');
    $command = "$mysqldump --opt -h $dbhost -u $dbuser -p $dbpass $dbname > $dbname.sql";
    exec($command);

But i get a blank file and the size is 0 kb

Answer 1

I think writing a custom PHP script is overkill. If you need to backup your database monthly you can use cron, elsewhere use phpmyadmin.

Answer 2

You wil find backup file in "./" (directory of actually running script)

Its saved like .sql witch is gziped

mysqldump --opt -h $dbhost -u $dbuser -p $dbpass $dbname | gzip

.SQL you can find in .gz file

$backupFile = $dbname . date("Y-m-d-H-i-s") . '.gz';

You can use this script in cron for your monthly backup and in some "admin panel" by button for additional backups