What is trait in laravel

In laravel, traits are a code reuse mechanism prepared for single inheritance languages ​​like PHP. Traits are used to reduce the restrictions of single inheritance languages ​​and enable developers to freely work within different hierarchies. Reusing methods in independent classes can be simply understood as an implementation method to facilitate code reuse.

#The operating environment of this article: Windows 10 system, Laravel version 6, Dell G3 computer.

What is trait in laravel

Trait is a code reuse mechanism prepared for single inheritance languages ​​like PHP. Traits are designed to reduce the limitations of single-inheritance languages ​​and allow developers to freely reuse methods in independent classes within different hierarchies. The semantics of Trait and Class composition define a way to reduce complexity and avoid the typical problems associated with traditional multiple inheritance and Mixin classes.

First we need to know how to define a Trait. The keyword used is trait

namespace App\Traits;
trait HasCreator
{
}

Call

namespace App;
use App\Traits\HasCreator;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
class Post extends Model
{
    use HasCreator， SoftDeletes;
    protected $fillable = ['title', 'user_id'];
    protected static function boot()
    {
        parent::boot();
        self::hasCreator();
    }
}

to merge the methods in the Trait into the model. Just use it and then call it as you declared.

There is actually a priority here: calling class>Trait> parent class

trait SoftDeletes
{
    protected $forceDeleting = false;
    public static function bootSoftDeletes()
    {
        ...
    }
    public function forceDelete()
    {
      ...
    }
}

trait can define properties and methods

Method name in trait: hasCreator () is changed to bootHasCreator and will be called by default when using

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