laravel 8 foreign key migration

1$table->unsignedBigInteger('user_id');
2$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');

1Schema::table('posts', function (Blueprint $table) {
2    $table->unsignedBigInteger('user_id');
3
4    $table->foreign('user_id')->references('id')->on('users');
5});
6OR
7Schema::table('posts', function (Blueprint $table) {
8    $table->foreignId('user_id')->constrained();
9});

1To rollback one step:
2
3php artisan migrate:rollback
4
5To rollback multiple steps:
6
7php artisan migrate:rollback --step=[x]
8  
9To drop all tables and reload all migrations:
10
11php artisan migrate:fresh

1Schema::table('posts', function (Blueprint $table) {
2    $table->unsignedBigInteger('user_id');
3
4    $table->foreign('user_id')->references('id')->on('users');
5});

1use Illuminate\Database\Schema\Blueprint;
2use Illuminate\Support\Facades\Schema;
3
4Schema::table('posts', function (Blueprint $table) {
5    $table->unsignedBigInteger('user_id');
6
7    $table->foreign('user_id')->references('id')->on('users');
8});

1$table->foreignId('post_id')
2                ->constrained()
3                ->onUpdate('cascade')
4                ->onDelete('cascade');