add more interesting PHP example code

editor.html

@@ -159,7 +159,21 @@ for i in sys.argv[1:]:
 
     <script type="text/editor" id="phptext"><?php
 
-phpinfo();
+function nfact($n) {
+  if ($n == 0) {
+    return 1;
+  }
+  else {
+    return $n * nfact($n - 1);
+  }
+}
+
+echo "\n\nPlease enter a whole number ... ";
+$num = trim(fgets(STDIN));
+
+// ===== PROCESS - Determing the factorial of the input number =====
+$output = "\n\nFactorial " . $num . " = " . nfact($num) . "\n\n";
+echo $output;
 
 ?></script>