使用PHP备份数据库-mysqldump

Question

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

My backup file ends up being an empty zero byte file.

My authentication and connection details are correct.

I enabled error reporting - no errors.

Server is running PHP 5.6.

Answer 1

According to mysqldump documentation, you shouldn't put space between -p and password:

· --password[=password] , -p[password]

The password to use when connecting to the server. If you use the short option form (-p), you cannot have a space between the option and the password. If you omit the password value following the --password or -p option on the command line, mysqldump prompts for one.

Answer 2

从PHP调用mysqldump时，您可能需要编写可执行文件的完整路径 （即：“ / usr / local / mysql-5.1.52-osx10.6-x86_64 / bin / mysqldump ”，而不是“ mysqldump ”）