使用NOW（）的Update_batch数组codeigniter不起作用

What I want is to make a database update with codeigniter where I put a value to current timestamp: My settings array:

$settingsMachineUpdateEvent[] = array(
        'id' => $eventId,
        'etid' => '5',
        'insert_by' => '2',
        'modified_date' => $currentTime
        );

And my $currentTime:

$currentTime = date_default_timezone_get();

And I send the update like this:

$this->db->update_batch('balance_events', $settingsMachineUpdateEvent, 'id');

My problem is the $currentTime var, I want to assign it the current time stamp so I can update my modified_date column from mysql with the current timestamp value. I also try'ed with NOW(), time(), and assign it directly from array, nothing worked, I will get 0000-00-00 00:00:00 after the update. Where is the issue? Thanks!

Instead of this:

$currentTime = date_default_timezone_get();

try

$currentTime = date('Y-m-d H:i:s');  // for current time

$currentTime = time();  // for current timestamp

Explanation: date_default_timezone_get() is used to get the timezone, but in your case you need the time or timestamp to store in the table.