Initial data commit

Task/Mutual-recursion/PHP/mutual-recursion.php

@@ -0,0 +1,23 @@
+<?php
+function F($n)
+{
+  if ( $n == 0 ) return 1;
+  return $n - M(F($n-1));
+}
+
+function M($n)
+{
+  if ( $n == 0) return 0;
+  return $n - F(M($n-1));
+}
+
+$ra = array();
+$rb = array();
+for($i=0; $i < 20; $i++)
+{
+  array_push($ra, F($i));
+  array_push($rb, M($i));
+}
+echo implode(" ", $ra) . "\n";
+echo implode(" ", $rb) . "\n";
+?>