Laravel not updating null values to column - laravel

Question

Migration
Schema::create('users', function (Blueprint $table) {
$table->increments('user_id');
$table->string('username',50)->unique();
$table->date('start_date');
$table->date('end_date')->nullable();
$table->timestamps();
});
Here start_date set as column type date and nullable
When running Insert function like below its inserting null values
$insert = [
'username' =>strtoupper(request('username')),
'password' =>Hash::make(request('password')),
'start_date' =>date('Y-m-d',strtotime(request('start_date'))),
];
if(request()->filled('end_date')){
$insert['end_date'] = date('Y-m-d',strtotime(request('end_date')));
}
User::create($insert);
When Updating the same row left blank as end_date input,
$user = User::GetWithEncrypted(request('user_id'));
$update ['start_date'] = date('Y-m-d',strtotime(request('start_date')));
if(request()->filled('end_date')){
$update['end_date'] = date('Y-m-d',strtotime(request('end_date')));
}else{
$update['end_date'] = 'NULL';
}
$user->update($update);
In Table, it comes like below
How can I make it NULL like insert function in update?
My strict mode is false now, If I make it true it will throw an exception of invalid data for the end_date column.

Answer 1

Try replacing
}else{
$update['end_date'] = 'NULL';
}
with
}else{
$update['end_date'] = null;
}
'NULL' is a string whereas null is truly null.

Answer 2

you have 2 solution for this problem:
1.
$user = User::GetWithEncrypted(request('user_id'));
$update ['start_date'] = date('Y-m-d',strtotime(request('start_date')));
if(request()->filled('end_date')){
$update['end_date'] = date('Y-m-d',strtotime(request('end_date')));
}else{
$update['end_date'] = '".date('00:00:00')."';
}
$user->update($update);
2.
you have to set default in mysql database on end date field

Answer 3

First set table field to nullable()
Second set table field DEFAULT to NULL
Third:
$model->field = null;