add existing table in migration laravel code example

Example 1: add new column in laravel migration

Schema::table('table_name', function (Blueprint $table) {
            $table->string('column_name', 255)->nullable()->after('previous_column_name');
        });

Example 2: migrate to an existing table in laravel commad

public function up()
{
    Schema::table('users', function($table) {
        $table->integer('paid');
    });
}