检查请求对象为空Laravel

Question

add multiple contacts at once. If a contact has details in a form.I want to check the if the output values are null I don't want to save the values. otherwise, save the values

 <tr >
 <td> {!!Form::text('contact[][first_name]',NULL,['class'=>'form-control'])!!}
 </td>
 <td> {!!Form::text('contact[][last_name]',NULL,['class'=>'form-control'])!!}
 </td>
 <td> {!!Form::text('contact[][email]',NULL,['class'=>'form-control'])!!}
 </td>
 <td> {!!Form::text('contact[][contact]',NULL,['class'=>'form-control'])!!}
 </td>

the problem I'm facing is

 $contacts =  $request->contacts ;

I want to check if any values in this request are not null save to database.if all the values in the request. don't need to save

Answer 1

Check them with a foreach loop:

$save = true;
foreach ($contacts as $contact) {
    if ($contact === null) {
        $save = false;
    }
}

if ($save) {
    //Save everything
}

Answer 2

I'm not sure if you mean you want to know if there is any value which is null , or if all values are null (or rather, any value isn't null ).

For either case, there are several native array functions you could use.

To know if any value in the array is null

I would use in_array :

in_array ( mixed $needle , array $haystack [, bool $strict = FALSE ] ) : bool

Searches haystack for needle using loose comparison unless strict is set.

In your case:

$save = in_array(null, $contacts);

To know if any value in the array isn't null

I would use array_filter

array_filter ( array $array [, callable $callback [, int $flag = 0 ]] ) : array

Iterates over each value in the array passing them to the callback function. If the callback function returns true, the current value from array is returned into the result array. Array keys are preserved.

... If no callback is supplied, all entries of array equal to FALSE ( see converting to boolean ) will be removed.

So if you don't distinct between null or other false -y values, just use:

$flitered = array_filter($contacts);

Which will create an array of only the truth -y values in $contacts.

If you want to filter null strictly, you'll need to pass a filter callback. Since there's no is_not_null function, we'll define it:

$filtered = array_filter($contacts, function ($val) {
    return $val !=== null;
});

(As an aside, I've seen mentions of it being very slightly optimized to define anonymous callbacks as static , but that's irrelevant).

You can then:

$save = (bool) $filtered;

Casting an array to boolean will result in false if empty (no valid values in $contacts ), true otherwise.