Printing numers without using PHP inbuild functions

Question

$numbers = array(3,5,6,7,8,11);
$missing = array();
for ($i = 3; $i < 11; $i++) {
    if (!in_array($i, $numbers)){
        $missing[] = $i;
    }
}

I want to find the missing numbers from 3 to 11 without using PHP innuild function, i have tried but i haven't not completed fully.

In this code i have used in_array but without this i have to do. any one help here.I am new to PHP using PHP inbuild i can do this, but this is not my case.

Answer 1

you can use array_diff same as :

$numbersOrigin = range(3, 11);
$numbers = array(3,5,6,7,8,11);

$missing = array_diff($numbersOrigin, $numbers);

unuse buildIn functions :

$numbers = array(3,5,6,7,8,11);
$missing = array();
$index = 0;
for ($i = 3; $i < 11; $i++) {
   if ($numbers[$index] === $i) {
         $index++;
   } else {
      $missing[] = $i;
   }
}