PHP Export MySQL database file

There is a MySQL database, about 1G, is virtual space, no way to log on to the MySQL command line, I just can connect through the Web, how to export data into my FTP directory.
I just can write SQL statements like this, like

$sql = ' SELECT * FROM TableName ';
mysql_query ($sql);

Just so you can query, I know how to export in the command line, such as open cmd in Windows
Then enter Mysqldump-u tab-p tablename >d:/backup.sql The input will prompt for the password
Then you can export it normally.

But I don't know how to export it on the web, how to write this SQL.

There is also if the database is relatively large, so that the timing of script execution has a time-sensitive, such as 100MB database that must be quickly backed up.

1G,10GB like this, if I close the browser after the page is executed, is the SQL statement still executing in the background?

Reply to discussion (solution)

Mei, no one replied to me, and I couldn't find the relevant information.

Close the browser, this SQL statement must have stopped
Not affected use the Ignore_user_abort function

Close the browser, this SQL statement must have stopped
Not affected use the Ignore_user_abort function

This CSV file 1103 lines, but after inserting the database I see only 1075, so I do not know which of the few have not inserted successfully into, is to insert the failure to find out

This CSV file 1103 lines, but after inserting the database I see only 1075, so I do not know which of the few have not inserted successfully into, is to insert the failure to find out
Delete the insert once inserted to make a judgment failure write a log to see the log file in a log file which failed

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