Find the first missing number in a sequence of numbers

Question

It\'s the second day I try to find a solution for this problem.

I have an array.

$datas;

$datas[0]; // 8000
$datas[1]; // 8001
$datas[2]; // 8003
$datas         


        

Answer 1

With something like this, it's pretty simple to just iterate through the array with a foreach loop.

foreach ($datas as $key=>$val) { 
  if ( $val +1 != $datas[$key+1] ) { 
    echo $val+1; // this is the first free value in the sequence
    }
  }