[Json] Change unit test.

The casting from string to float using (float) is not locale aware.

Probably this function could be refactored implementing something like this
http://www.php.net/manual/en/function.floatval.php#92563

library/Zend/Json/Encoder.php

@@ -235,7 +235,7 @@ protected function _encodeArray(&$array)
      * If value type is not a string, number, boolean, or null, the string
      * 'null' is returned.
      *
-     * @param $value mixed
+     * @param  mixed $value
      * @return string
      */
     protected function _encodeDatum(&$value)
@@ -244,7 +244,7 @@ protected function _encodeDatum(&$value)
 
         if (is_int($value) || is_float($value)) {
             $result = (string) $value;
-            $result = str_replace(",", ".", $result);
+            $result = str_replace(',', '.', $result);
         } elseif (is_string($value)) {
             $result = $this->_encodeString($value);
         } elseif (is_bool($value)) {

tests/Zend/Json/JsonTest.php

@@ -20,6 +20,7 @@
  */
 
 namespace ZendTest\Json;
+
 use Zend\Json;
 
 /**
@@ -693,17 +694,16 @@ public function testUtf8JSONExprFinder()
     /**
      * @group ZF-4437
      */
-    public function testKommaDecimalIsConvertedToCorrectJSONWithDot()
+    public function testCommaDecimalIsConvertedToCorrectJSONWithDot()
     {
-        $localeInfo = localeconv();
-        if($localeInfo['decimal_point'] != ',') {
-            $this->markTestSkipped("This test only works for platforms where , is the decimal point separator.");
+        setlocale(LC_ALL, 'Spanish_Spain', 'es_ES', 'es_ES.utf-8');
+        if (strcmp('1,2', (string)floatval(1.20)) != 0) {
+            $this->markTestSkipped('This test only works for platforms where "," is the decimal point separator.');
         }
-
         Json\Json::$useBuiltinEncoderDecoder = true;
-        $this->assertEquals("[1.20, 1.68]", Json\Encoder::encode(array(
-            (float)"1,20", (float)"1,68"
-        )));
+
+        $actual = Json\Encoder::encode(array(floatval(1.20), floatval(1.68)));
+        $this->assertEquals('[1.2,1.68]', $actual);
     }
 
     public function testEncodeObjectImplementingIterator()

tests/Zend/Locale/LocaleTest.php

@@ -49,7 +49,7 @@ public function setUp()
 
         LocaleTestHelper::resetObject();
         LocaleTestHelper::setCache($this->_cache);
-        putenv("HTTP_ACCEPT_LANGUAGE=,de,en-UK-US;q=0.5,fr_FR;q=0.2");
+        putenv('HTTP_ACCEPT_LANGUAGE=,de,en-UK-US;q=0.5,fr_FR;q=0.2');
     }
 
     public function tearDown()