How can PHP get the post value in bulk and store it in the database?

Novice ask PHP How to bulk get post value and stored in the database!
$data =array ();
$data [' A ']=in ($_post[' a ']);
$data [' B ']=in ($_post[' B ');
$data [' C ']=in ($_post[' c]);
$data [' d ']=in ($_post[' d ']);
$data [' AA ']=in ($_post[' AA ');
$data [' A1 ']=in ($_post[' A1 ');
.................. omitted here
Model (' Xitong ')->update ("Id=1", $data);

The above is a normal update of the database PHP code

However, the current problem is that there are more than 50 fields in this table for your needs. And like
$data [' A ']=in ($_post[' a ']), so the format of a line input, it feels very unscientific.
Can you get the post value in bulk by field name and update to the database together?

------Solution--------------------
First, if the Psot pass a database, the key will be an error.
All I say to do field filter
You can use this method if you don't always insert all the fields.

The second is to check that each field is not a value
If all fields are inserted every time, you can use this release

Each has its own benefits to see how people use

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