有没有办法自动声明数组中的变量？

Question

I'm learning PHP and working in Codeigniter. I feel that I am typing similar things over again (duplicating work) when I am making data arrays and declaring the variables I need for functions.

Here is an example:

  //MAKE ARRAY OF USER ANSWERS TO QUESTIONS
    $dropdowndata = array
    (   'user_socialhour' => $this->input->post('socialhour'),
        'user_socialpm' => $this->input->post('socialpm'),
        'user_eventhour' => $this->input->post('eventhour'),
        'user_eventpm' => $this->input->post('eventpm');

    //DECLARE THE VARIABLES I NEED FOR FUNCTIONS
         $user_socialhour = $this->input->post('socialhour');
        $user_socialpm = $this->input->post('socialpm');
        $user_eventhour = $this->input->post('eventhour');
        $user_eventpm = $this->input->post('eventpm');

     $calculateddata = array
    ('user_mornafteve' => $this->mornafteve($user_socialhour, >$user_socialpm), 'user_beforeafter' => $this->beforeafter($user_socialpm, >$user_eventpm, $user_socialhour, $user_eventhour));

I am looking for a way to automate the declaration of all the variables in the dropdowndata array. I am looking for something like, for each key, declare the variables according to the following pattern.

Does this exist?

Answer 1

Ye,

foreach($dropdowndata as $key=>$value) {
    $$key = $this->input->post(substr($key, 5))
}

But not sure why you need these as variables at all... why not just use as:

//MAKE ARRAY OF USER ANSWERS TO QUESTIONS
    $dropdowndata = array(   
        'user_socialhour' => $this->input->post('socialhour'),
        'user_socialpm' => $this->input->post('socialpm'),
        'user_eventhour' => $this->input->post('eventhour'),
        'user_eventpm' => $this->input->post('eventpm');

    $calculateddata = array(
        'user_mornafteve' => $this->mornafteve($dropdowndata['user_socialhour'], $dropdowndata['user_socialpm']), 
        'user_beforeafter' => $this->beforeafter($dropdowndata['user_socialpm'], $dropdowndata['user_eventpm'], $dropdowndata['user_socialhour'], $dropdowndata['user_eventhour']));