Fix generator xrange() example

Patch by KodyWiremane.

Closes #4.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@347735 c90b9560-bf6c-de11-be94-00142212c4b1

Author: nikic

language/generators.xml

@@ -49,20 +49,20 @@
 <![CDATA[
 <?php
 function xrange($start, $limit, $step = 1) {
-    if ($start < $limit) {
+    if ($start <= $limit) {
         if ($step <= 0) {
-            throw new LogicException('Step must be +ve');
+            throw new LogicException('Step must be positive');
         }
 
         for ($i = $start; $i <= $limit; $i += $step) {
             yield $i;
         }
     } else {
         if ($step >= 0) {
-            throw new LogicException('Step must be -ve');
+            throw new LogicException('Step must be negative');
         }
 
-        for ($i = $start; $i >= $limit; $i -= $step) {
+        for ($i = $start; $i >= $limit; $i += $step) {
             yield $i;
         }
     }