what is Route Parameters in laravel

Answer

Basic Route Parameter

Route::get('user/{id}', function($id)
{
    return 'User '.$id;
});

Note: Route parameters cannot contain the - character. Use an underscore (_) instead.

Optional Route Parameters

Route::get('user/{name?}', function($name = null)
{
    return $name;
});

Optional Route Parameters With Default Value

Route::get('user/{name?}', function($name = 'John')
{
    return $name;
});

Regular Expression Parameter Constraints

Route::get('user/{name}', function($name)
{
    //
})
->where('name', '[A-Za-z]+');

Route::get('user/{id}', function($id)
{
    //
})
->where('id', '[0-9]+');

Passing An Array Of Constraints

Route::get('user/{id}/{name}', function($id, $name)
{
    //
})
->where(['id' => '[0-9]+', 'name' => '[a-z]+'])

Defining Global Patterns

If you would like a route parameter to always be constrained by a given regular expression, you may use the pattern method. You should define these patterns in the boot method of your RouteServiceProvider:

$router->pattern('id', '[0-9]+');

Once the pattern has been defined, it is applied to all routes using that parameter:

Route::get('user/{id}', function($id)
{
    // Only called if {id} is numeric.
});

Accessing A Route Parameter Value

If you need to access a route parameter value outside of a route, use the input method:

if ($route->input('id') == 1)
{
    //
}

You may also access the current route parameters via the Illuminate\Http\Request instance. The request instance for the current request may be accessed via the Request facade, or by type-hinting the Illuminate\Http\Request where dependencies are injected:

use Illuminate\Http\Request;

Route::get('user/{id}', function(Request $request, $id)
{
    if ($request->route('id'))
    {
        //
    }
});