Data update

Task/Multifactorial/PHP/multifactorial.php

@@ -0,0 +1,20 @@
+<?php
+// Multifactorial
+for ($degree = 1; $degree <= 5; $degree++) {
+  echo 'Degree '.$degree.' => ';
+  for ($n = 1; $n <= 10; $n++)
+    echo multifactorial($n, $degree).' ';
+  echo PHP_EOL;
+}
+
+function multifactorial (int $n, int $degree): int {
+  if ($n < 2)
+    return 1;
+  else {
+    $result = $n;
+    for ($i = $n - $degree; $i >= 2; $i -= $degree)
+      $result = $result * $i;
+    return $result;
+  }
+}
+?>