Find The Missing Number In The Given Array List Using PHP

 Hi All,

Here, I have finding the Missing number from the array.

Function: sort();

Syntax: sort(array, sorttype);

Description: sorts an indexed array in ascending order.

Function: range();

Syntax: range(low, high, step);

Description : It creates an array containing a range of elements.

                        This function returns an array of elements from low to high.

Function: max();

Syntax: max(array_values);               

                 or

                max(value1,value2,...);

Description : It returns the highest value in an array, or the highest value of several specified values.

<?php 

function missing_number($num_order) {

// Sort an array number for finding the first value of an array 

sort($num_order);

 // construct a new array

$new_array = range($num_order[0],max($num_order));                                         

// use array_diff to find the missing elements 

return array_diff($new_array , $num_order);

}

print_r(missing_number(array(10,4,3,6,7,8)));

echo"</br>";

print_r(missing_number(array(10,15,18,16,17,20)));

echo"</br>";

print_r(missing_number(array(1,2,5,6,7,8,9)));

echo"</br>";

?>

Output:

Array ( [2] => 5 [6] => 9 )
Array ( [1] => 11 [2] => 12 [3] => 13 [4] => 14 [9] => 19 )
Array ( [2] => 3 [3] => 4 )