如何从输入数组中选择所选值

Question

I have 7 input fields. However the user may only pick a maximum of 3 subjects. How would I be able to update these inputs into my table?

public function searchgrouppost(){

         $subject1 = Input::get('subject1');
         $subject2 = Input::get('subject2');
         $subject3 = Input::get('subject3');
         $subject4 = Input::get('subject4');
         $subject5 = Input::get('subject5');
         $subject6 = Input::get('subject6');
         $subject7 = Input::get('subject7');

My aim is to end up with something like this:

DB::table('mytable')->where('id', 6)
                    ->update(['subject' => $firstchosensubject,
                           'subjecttwo' => $secondchosensubject, 
                           'subjectthree' =>$thirdchosensubject]);

So far I have:

$subjects = [];
$inputs = Input::all();
array_walk($inputs, function ($v, $k) use (&$subjects) {
if(starts_with($k, 'subject')) {
    $subjects[$k] = $v;
}
});

$index = count($subjects);

Shown above I have all inputs in this $subjects variable. How do I extract these values for table input?

Answer 1

I would suggest validating the inputs on the front end rather than trying to do with php. Here is some JQuery that would get you on your way

var numSubjects = 0;
$(".inputs").each(function(i, obj) {
    if($(this).val() != ""){
        numSubjects++;
    }
});

if(numSubjects > 3){
    // let the user know
}else{
    // submit the form
}