How to Calculate Array Sum in PHP Without Using Built-in Functions

The array_sum function in PHP is a array function that calculates the sum of all numeric values in an array.

Here is a simple PHP code example that demonstrates how to calculate the sum of an array without using any built-in PHP functions:

<?php
// Function to calculate the sum of an array manually
function calculateArraySum($array) {
    $sum = 0; // Initialize sum to zero

    // Iterate through each element in the array
    foreach ($array as $value) {
        $sum += $value; // Add the value to the sum
    }

    return $sum; // Return the calculated sum
}

// Example usage
$numbers = [10, 20, 30, 40];
$result = calculateArraySum($numbers);

echo "The sum of the array is: " . $result;
?>

Output:

The sum of the array is: 100

Explanation:

1. Input Array: An array of numbers is provided as input (e.g., [10, 20, 30, 40]).
2. Initialization: A variable $sum is initialized to store the cumulative sum.
3. Loop Through Array: Each value in the array is added to $sum using a foreach loop.
4. Return the Sum: The function returns the final sum, which is then displayed.

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