How to add an array value to the middle of an associative array?

Question

Lets say I have this array:

$array = array(\'a\'=>1,\'z\'=>2,\'d\'=>4);

Later in the script, I want to add the value \'c\'=>3<

Answer 1

function insertValue($oldArray, $newKey, $newValue, $followingKey) {

    $newArray = array ();
    foreach (array_keys($oldArray) as $k) {
        if ($k == $followingKey)
            $newArray[$newKey] = $newValue;
        $newArray[$k] = $oldArray [$k];
    }

    return $newArray;
}

You call it as

insertValue($array, 'c', '3', 'z')

As for Edit 5:

edit your sql, so that it reads

SELECT ..., pizza, drink, pizza+drink as full_meal, ... FROM ....

and you have the column automatically:

Array (
  ...
  'pizza' => 12,
  'drink' => 5,
  'full_meal' => 17,
  ...
)