Codeigniter: 'foreign_key_checks' => FALSE : constraints appear in backup file

[casa10]

Hello,
When i put 'foreign_key_checks' => FALSE in preferences for backup database, the foreign key constraints appear in the backup file.
If i set it toTRUE, it's the same thing. For TRUE setting it's "normal" but with FALSE not yet.

There is a possible error ?
I use CI 3.06, driver mysqli (Mysql version 5.6.15)

My code:
$this->load->dbutil();
$prefs = array( 'newline' => "\n",
'add_drop' => TRUE,
'add_insert' => TRUE,
'format' => 'zip',
'filename' => 'back.sql',
'foreign_key_checks' => FALSE,
);
$backup = $this->dbutil->backup($prefs);
$this->load->helper('file');
$nom_export = date('Y_m_d').'_fuge.sql.zip';
write_file(UPLOAD.$nom_export, $backup);

[narfbg]

The option doesn't remove the foreign keys, it only causes MySQL to ignore foreign key checks while importing the data, because that could otherwise make it impossible to import.

[casa10]

Thank you.

[narfbg]

Don't thank me, just don't post here about every problem you encounter, like you have done twice before.

[casa10]

This is not the first time that you meet so unpleasant to people. I have found that your comrades have already made you such remarks when replying to different people asking for help or reporting a problem. Should learn to have restraint. This demonstrates the maturity.
Have a good day.

[narfbg]

Sorry for asking you not to use our bug tracker as a free help request service, after you've done that 3 times.