<?php

function findnumber($numbers)
{
    $count = count($numbers);
    for ($i = 1; $i <= $count; $i++)
    {
        $flag = true;
        for ($j = 0; $j < $count; $j++)
        {
            if($numbers[$j] <= 0) continue;
            if($i == $numbers[$j]){
                $flag = false;
                break;
            }
        }
        if($flag){
            return $i;
        }
    }
}

$numbers = array(12, 7, 28, -2, 30, 5, 33, -8, 1, 2);
print "for reference ";
print_r($numbers);
print "\nsmallest +ve missing number is ";
echo findnumber($numbers);
print "\n";