PHP Exercises: Compute the sum of the numbers in a given array except those numbers starting with 5 followed by atleast one 6

Last update on May 28 2025 13:07:16 (UTC/GMT +8 hours)

109. Sum Excluding Numbers Starting with 5 Followed by 6

Write a PHP program to compute the sum of the numbers in a given array except those numbers starting with 5 followed by atleast one 6. Return 0 if the given array has no integer.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that takes an array of numbers as a parameter
function test($nums)
 {
    // Initialize variables $sum, $inSection, and $flag with values of 0
    $sum = 0;
    $inSection = 0;
    $flag = 0;

    // Iterate through the elements of the array using a for loop
    for ($i = 0; $i < sizeof($nums); $i++)
    {
        // Set $inSection to 0 at the beginning of each iteration
        $inSection = 0;

        // Check if the current element is equal to 5
        if ($nums[$i] == 5)
        {
            // Set $inSection to 0 and $flag to 1 if true
            $inSection = 0;
            $flag = 1;
        }

        // Check if $inSection is 0 and the current element is 6
        if ($inSection == 0 && $nums[$i] == 6)
        {
            // Check if $flag is 1
            if ($flag == 1)
            {
                // Subtract 5 from $sum, set $inSection to 1
                $sum = $sum - 5;
                $inSection = 1;
            }
            
            // Set $flag to 0
            $flag = 0;
        }

        // Check if $inSection is 0
        if ($inSection == 0)
        {
            // Add the value of the current element to $sum
            $sum += $nums[$i];
        }
    }

    // Return the sum of the numbers in the array, excluding those starting with 5 followed by at least one 6
    return $sum;
 }

// Print the results for different arrays
echo "Sum of the numbers of the said array except those numbers starting with 5 followed by at least one 6:\n". test([1, 5, 7, 9, 10, 17] );
echo "\nSum of the numbers of the said array except those numbers starting with 5 followed by at least one 6:\n". test([1, 5, 6, 9, 10, 17] );
echo "\nSum of the numbers of the said array except those numbers starting with 5 followed by at least one 6:\n". test([5, 6, 7, 9, 10, 17, 1] );
echo "\nSum of the numbers of the said array except those numbers starting with 5 followed by at least one 6:\n". test([11, 9, 10, 17, 5, 6] );
?>

Sample Output:

Sum of the numbers of the said array except those numbers starting with 5 followed by atleast one 6:
49
Sum of the numbers of the said array except those numbers starting with 5 followed by atleast one 6:
37
Sum of the numbers of the said array except those numbers starting with 5 followed by atleast one 6:
44
Sum of the numbers of the said array except those numbers starting with 5 followed by atleast one 6:
47

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to sum elements in an array while omitting numbers that begin with 5 and have a 6 immediately following in their digit sequence.
Write a PHP function to convert numbers to strings and conditionally exclude those matching the pattern "56..." from the total sum.
Write a PHP program to apply regex matching on the string representation of numbers and skip summing those that fit the disallowed pattern.
Write a PHP script to iterate over an array, check each value’s digits, and add only those that do not start with 5 followed by 6.

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PHP Code Editor:

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