What is casting?

Convert attributes to another data type.

When you need casting?

Boolean: when you need to save/retrieve a value as Bool, bool with only 2 values is 0 or 1, you need type casting. When you need add "sex" attribute for User Model, you add:

    protected $casts = [    // $cast: is variable from Model
        'sex' => 'boolean', // sex is male/female, compatible with 1/0 
    ];

How to apply casting?

And, after add 3 line of code before, you can use:

$user = App\User::find(1);
if ($user->sex) {
    
}