migrations/2017_11_26_015000_create_user_roles_table.php
public function up()
    {
        Schema::create('user_roles', function (Blueprint $table) {
            $type = DB::connection()->getDoctrineColumn('users', 'id')->getType()->getName();
            if ($type == 'bigint') {
                $table->bigInteger('user_id')->unsigned()->index();
            } else {
                $table->integer('user_id')->unsigned()->index();
            }

            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
            $table->bigInteger('role_id')->unsigned()->index();
            $table->foreign('role_id')->references('id')->on('roles')->onDelete('cascade');
            $table->primary(['user_id', 'role_id']);
        });
    }
public function up()
    {
        Schema::create('user_roles', function (Blueprint $table) {
            $type = DB::connection()->getDoctrineColumn('users', 'id')->getType()->getName();
            if ($type == 'bigint') {
                $table->bigInteger('user_id')->unsigned()->index();
            } else {
                $table->integer('user_id')->unsigned()->index();
            }

            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
            $table->bigInteger('role_id')->unsigned()->index();
            $table->foreign('role_id')->references('id')->on('roles')->onDelete('cascade');
            $table->primary(['user_id', 'role_id']);
        });
    }
Run the migrations.

@return void