mysqldump not working through php

Question

I am trying to take mysqldump of database through php, i am able to take database dump through command line this way only.

d:
cd "d:\wamp\bin\mysql\mysql5.5.24\bin"
mysqldump.exe
mysqldump --user=user --password=password --host=localhost db_name > "D:\dump\test.sql"

when trying to execute this command from php this way, i get a empty dump file.

$cmd  = 'd: cd "d:/wamp/bin/mysql/mysql5.5.24/bin"mysqldump.exe>mysqldump --user=user --password=password --host=localhost db_name > "D:\dump\test.sql"';
exec($cmd);

or this way

$cmd  = 'd:/wamp/bin/mysql/mysql5.5.24/bin>mysqldump.exe>mysqldump --user=user --password=password --host=localhost db_name > D:\dump\test.sql';
exec($cmd);

or this way

$cmd  = 'd:/wamp/bin/mysql/mysql5.5.24/bin>mysqldump --user=user --password=password --host=localhost db_name > D:\dump\test.sql';
exec($cmd);

I get only empty dump file. i have gone through a lot of questions here like this , and this and lot more, but none of that solution is working for me.

Please see and suggest any possible way to do it.

Thanks.

Answer 1

You seems to use Windows, the way to create multi-command lines is to use the '&' operator ( more info )

Example :

$cmd  = 'd: & cd "d:/wamp/bin/mysql/mysql5.5.24/bin" & mysqldump.exe --user=user --password=password --host=localhost db_name > "D:\dump\test.sql"';
exec($cmd);

Also, double-check your paths because you are using d:/wamp/... and later D:\\dump\\test.sql , it seems that your command use slash and antislash and only \\ should work.

At last, you can debug your command using a second argument to exec :

$output = array();
exec($cmd, $output);
var_dump($output);