php code to mysql database export [duplicate]

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Best practice: Import mySQL file in PHP; split queries

How to import import *.sql file into dat开发者_如何学Goabase and export db to *.sql file in php coding?

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exec("mysqldump database -u username -p password  > output.sql");

http://ca3.php.net/manual/en/function.exec.php

http://dev.mysql.com/doc/refman/5.1/en/mysqldump.html