I can not recover the values ​of my checkbox in my controller - forms

Question

I'm working on a symfony project, I created a checkbox in twig, I want to get checked values ​​in my Controller but I still get a null, I do not know what the problem is please help:
My Action:
public function sendSmsAction(Request $request) {
if ($request->isMethod('get')) {
$ids = $request->query->get('id');
var_dump($ids);
die();
}
return $this->render('CeUtilisateurBundle:Utilisateur:sms.html.twig')
}
My Form in twig:
<form
method="GET"
action="{{path('ce_utilisateur_send_sms') }}"
id="lbad_form_sms"
name="users"
>
{% if listUsers is not empty %}
{% for usr in listUsers %}
<input
id="userchecked"
name="{{usr.id}}"
type="checkbox"
value="{{ usr.telephone }}"
/>
<span>{{ usr.username }}</span>
</form>

Answer 1

Aside from other issues in your example, in order to get those values you need to change the HTML part that displays checkboxes and give them different IDs, proper values and the same name:
<input id="telephone{{ usr.id }}" name="telephone[]" type="checkbox" value="{{ usr.telephone }}"/>
Notice that the name property is the same for every checkbox and has [] at the end - this allows to pass multiple values for one property.
Next to that I would suggest to use a POST request to submit the form, instead of the GET you are using. If you do so, you can get the selected phone numbers in the controller like that:
$telephones = $request->request->get('telephone');
If you want to submit the form with a GET request, then use query instead of the request:
$telephones = $request->query->get('telephone');

Answer 2

First, you're missing closing tags in twig for your if and for, but I assume they just got lost during copying.
Second, you give all your input elements the same id "userchecked". Each HTML element should have a unique ID, e.g. by appending your user ID.
Something similar happens with the name attribute. If you give multiple form elements the same name, only the last one will be submitted.
So your form should look something like this:
<form
method="GET"
action="{{path('ce_utilisateur_send_sms') }}"
id="lbad_form_sms"
name="users"
>
{% if listUsers is not empty %}
{% for usr in listUsers %}
<input
id="{{"userchecked_" ~ usr.id}}"
name="{{"checked_" ~ usr.id}}"
type="checkbox"
value="{{ usr.telephone }}"
/>
<span>{{ usr.username }}</span>
{% endfor %}
{% endif %}
<input type="submit" value="Envoyer un sms!"/>
</form>
To fix your controller, you have to get the input by the name field. Since it is dynamically created, it's easiest to just get all parameters and loop over them.
public function sendSmsAction(Request $request) {
if ($request->isMethod('get')) {
$parameters = $request->query->all();
foreach ($parameters as $name => $value) {
var_dump("$name: $value");
}
die();
}
return $this->render('CeUtilisateurBundle:Utilisateur:sms.html.twig')
}
Note that there will be no submitted parameter for an empty checkbox.