循环数组中奇数幂运算cube_odd

Author: uuk020

cube_odd/cube_odd.php

@@ -0,0 +1,19 @@
+<?php
+/*
+ * 循环数组中奇数幂运算
+ * 1.Find the sum of the odd numbers within an array, after cubing the initial integers.(注: 数组奇数三次幂相加)
+ * This function will return undefined (NULL in PHP) if any of the values aren't numbers.
+ */
+function cube_odd(array $a)
+{
+    $sum = 0;
+    // 循环数组, 排除非数字的.
+    foreach ($a as $v) {
+        if (!is_numeric($v)) {
+            return null;
+        } elseif (0 != $v % 2) { // 筛选出奇数
+            $sum += pow($v, 3);
+        }
+    }
+    return $sum;
+}