How do I validate if array is empty? - php

Question

I have a form with 5 multiple-choice dropdown lists. When submitted, I am trying to run some validation to check that at least one item has been checked.
The code in my controller;
$input = Request::except('postcode_id'); //all user input from the form
$validator = \Validator::make(
[
$input => 'required'
]
);
if ($validator->fails())
{
print "failed";
}else{
print "passed";
}
The error I get is; Illegal offset type. I think I might need to do a custom validator but would like to check first in case there is an easier way.

Answer 1

The first argument of Validator::make() is the data, and the second is an array of validation rules, which are indexed by the input names. You can use required_without_all to validate that at least one must be present, but it is a little verbose:
$validator = \Validator::make($input, [
'dropdown_1' => 'required_without_all:dropdown_2,dropdown_3,dropdown_4,dropdown_5'
'dropdown_2' => 'required_without_all:dropdown_1,dropdown_3,dropdown_4,dropdown_5'
'dropdown_3' => 'required_without_all:dropdown_1,dropdown_2,dropdown_4,dropdown_5'
'dropdown_4' => 'required_without_all:dropdown_1,dropdown_2,dropdown_4,dropdown_5'
'dropdown_5' => 'required_without_all:dropdown_1,dropdown_2,dropdown_3,dropdown_4'
]);
Or write some code to generate the $rules array:
$fields = ['dropdown_1', 'dropdown_2', 'dropdown_3', 'dropdown_4', 'dropdown_5'];
$rules = [];
foreach ($fields as $i => $field) {
$rules[$field] = 'required_without_all:' . implode(',', array_except($fields, $i));
}
$validator = \Validator::make($input, $rules);

Answer 2

You need to use strings in your validator, not variables. Try this instead.
$validator = \Validator::make(
[
'input' => 'required'
]
);
Custom validator itself is not too difficult. I am using it all the time for array input validation. In Laravel 5 Request I will do something like that
public function __construct() {
Validator::extend("pcc", function($attribute, $value, $parameters) {
$rules = [
'container_id' => 'exists:containers,id'
];
foreach ($value as $containerId) {
$data = [
'container_id' => $containerId
];
$validator = Validator::make($data, $rules);
if ($validator->fails()) {
return false;
}
}
return true;
});
}
public function rules() {
return [
'containers' => 'required|pcc',
];
}