What are the advantages of using array_filter function in PHP for removing empty entries from an array before performing calculations?

When performing calculations on an array in PHP, it is important to remove any empty or null entries to avoid errors or unexpected results. The array_filter function in PHP can be used to easily remove these empty entries from an array before proceeding with calculations. This function takes an array and a callback function as parameters, and returns a new array with only the elements that pass the callback function's test.

// Example code to remove empty entries from an array before performing calculations

// Original array with empty entries
$array = [10, 20, null, 30, '', 40];

// Remove empty entries using array_filter
$filteredArray = array_filter($array, function($value) {
    return $value !== null && $value !== '';
});

// Perform calculations on the filtered array
$sum = array_sum($filteredArray);
echo "Sum of array elements after removing empty entries: " . $sum;