Condition inside route definition - php

Question

I just started to use ZendFramework 2. I defined a route in my module.config.php and I want to use the $this->url in my view to generate the url.
module.config.php
'settings-users-list' => array(
'type' => 'Zend\Mvc\Router\Http\Regex',
'options' => array(
'regex' => '/settings((/role/(?<role>[a-zA-Z]+))|)((/search/(?<search>[a-zA-Z0-9_-]+))|)((/page/(?<page>[0-9]+))|)((/date/(?<date>asc|desc))|)((/log/(?<log>asc|desc))|)',
'defaults' => array(
'controller' => 'Admin\Controller\Settings',
'action' => 'index',
),
'spec' => '/settings/role/%role%/search/%search%/page/%page%/date/%date%/log/%log%',
),
),
In my view
echo $this->url('admin/settings-users-list',$link_params,array('force_canonical' => true));
where
$link_params = array(
'controller' => 'settings',
'action' => 'index',
'role' => 'admin',
'search' => '',
'page' => '',
'date' => '',
'log' => '',
);
My problem is that when a part of my parameters are empty the generated url is not the desired one. In this case the the generated url is:
www.mysite.com/admin/settings/role/admin/search//page//date//log/
Is there a way to not display search, page, date, log if this parameter is not set. Maybe is there a way to put a condition in spec field of settings-users-list route in module.config.php.

Answer 1

In your case I would suggest to not add the search params like search, page, date and log to your route at all. Those are query params and for this ZF2 url helper has a special query key in options. You can also find this in the paragraph Query String Arguments in the ZF2 url view helper documentation. In your case you can use it like this:
$params = array(
'controller' => 'settings',
'action' => 'index',
'role' => 'admin'
);
$query = array(
'search' => '',
'page' => '',
'date' => '',
'log' => ''
);
$options = array(
'force_canonical' => true,
'query' => $query
);
echo $this->url('admin/settings-users-list', $params, $options);
I would also suggest to simplify your router. It will be much more readable without a regex:
'settings' => array(
'type' => 'Literal',
'options' => array(
'route' => '/settings'
)
'may_terminate' => false,
'child_routes' => array(
'role' => array(
'type' => 'Segment',
'options' => array(
'route' => '/role/:role'
'constraints' => array(
'role' => '[a-zA-Z]*'
),
'defaults' => array(
'controller' => 'Application\Controller\Settings',
'action' => 'index',
)
)
)
)
),
Then you can do like this:
echo $this->url('settings/role', $params, $options);