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To find the sum of cubes of natural numbers that are odd, the code is as follows −

<?php function sum_of_cubes_even($val) { $init_sum = 0; for ($i = 0; $i < $val; $i++) if ($i % 2 != 0) $init_sum += (2 * $i) * (2 * $i) * (2 * $i); return $init_sum; } print_r("The sum of cubes of first 8 natural numbers that are even is "); echo sum_of_cubes_even(8); ?>

The sum of cubes of first 8 natural numbers that are even is 3968

A function named ‘sum_of_cubes_even’ is defined that takes a limit on the natural number up to which the cube of every number needs to be found and each on them need to be added up. A ‘for’ loop is iterated over, and every number is cubed and added to an initial sum that was initially 0. The function is called by passing a number that is the limit as parameter. Relevant message is displayed on the console.

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