Can I add multiple columns at once in a Laravel migration

To add multiple columns to an existing table in a Laravel migration, you can use the `Schema::table()` method and chain multiple `$table->addColumn()` calls:

php
public function up()
{
    Schema::table('users', function (Blueprint $table) {
        $table->string('address')->after('email');
        $table->string('phone')->after('address');
        $table->date('birthday')->after('phone');
    });
}

In this example, we're adding three new columns - `address`, `phone`, and `birthday` - to the `users` table. The `after()` method specifies that each new column should be added after the given column.

Alternatively, you can use the `$table->after()` method to group the new columns together:

php
public function up()
{
    Schema::table('users', function (Blueprint $table) {
        $table->after('email', function ($table) {
            $table->string('address');
            $table->string('phone');
            $table->date('birthday');
        });
    });
}

This approach produces the same result as the previous example, but it groups the new column definitions together using the `$table->after()` method.

To remove the columns later, you can use the `$table->dropColumn()` method in the `down()` method of the migration:

php
public function down()
{
    Schema::table('users', function (Blueprint $table) {
        $table->dropColumn(['address', 'phone', 'birthday']);
    });
}

Finally, run the migration to apply the changes to the database:

php artisan migrate

This will add the new `address`, `phone`, and `birthday` columns to the `users` table.