Index: tests/Zend/Controller/Request/HttpTest.php
===================================================================
--- tests/Zend/Controller/Request/HttpTest.php	(revision 18232)
+++ tests/Zend/Controller/Request/HttpTest.php	(working copy)
@@ -675,6 +675,30 @@
     }
 
     /**
+     * @group ZF-5107
+     */
+    public function testParamSourcesHonoredByGetParams()
+    {
+        $_GET = array(
+            'get' => true
+        );
+        $_POST = array(
+            'post' => true
+        );
+        $params = array(
+            'foo' => 'bar',
+            'boo' => 'bah',
+            'fee' => 'fi'
+        );
+        $this->_request->setParams($params);
+
+        $this->_request->setParamSources(array('_POST'));
+        $expected = array_merge($params, $_POST);
+        $received = $this->_request->getParams();
+        $this->assertEquals($expected, $received);
+    }
+
+    /**
      * @group ZF-3161
      * @group ZFI-233
      * @group ZF-5818
Index: library/Zend/Controller/Request/Http.php
===================================================================
--- library/Zend/Controller/Request/Http.php	(revision 18232)
+++ library/Zend/Controller/Request/Http.php	(working copy)
@@ -727,10 +727,12 @@
     public function getParams()
     {
         $return = $this->_params;
-        if (isset($_GET) && is_array($_GET)) {
+
+        $paramSources = $this->getParamSources();
+        if (isset($_GET) && is_array($_GET) && in_array('_GET', $paramSources))  {
             $return += $_GET;
         }
-        if (isset($_POST) && is_array($_POST)) {
+        if (isset($_POST) && is_array($_POST) && in_array('_POST', $paramSources)) {
             $return += $_POST;
         }
         return $return;