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To find the sum of cubes of the first n natural numbers, the code is as follows −

<?php function sum_of_cubes($val) { $init_sum = 0; for ($x = 1; $x <= $val; $x++) $init_sum += $x * $x * $x; return $init_sum; } print_r("The sum of cubes of first 8 natural numbers is "); echo sum_of_cubes(8); ?>

The sum of cubes of first 8 natural numbers is 1296

A function named ‘sum_of_cubes’ is defined that initializes a sum to 0. Every natural number is multiplied by itself thrice (cube) and added to the initial sum. The limit is the value that is passed as a parameter to the function. The limit is defined outside the function and the function is called. Relevant output is displayed on the console.

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