Add opt-in for ignoring JSON_PRESERVE_ZERO_FRACTION when serializing

Author: polyfractal

src/Elasticsearch/ClientBuilder.php

@@ -89,6 +89,9 @@ class ClientBuilder
     /** @var null|bool|string */
     private $sslVerification = null;
 
+    /** @var bool  */
+    private $allowBadJSON = false;
+
     /**
      * @return ClientBuilder
      */
@@ -395,11 +398,23 @@ public function setSSLVerification($value = true)
         return $this;
     }
 
+    public function allowBadJSONSerialization()
+    {
+        $this->allowBadJSON = true;
+    }
+
     /**
      * @return Client
      */
     public function build()
     {
+        if(!defined('JSON_PRESERVE_ZERO_FRACTION') && $this->allowBadJSON === false) {
+            throw new RuntimeException("Your version of PHP / json-ext does not support the constant 'JSON_PRESERVE_ZERO_FRACTION',".
+            " which is important for proper type mapping in Elasticsearch. Please upgrade your PHP or json-ext.\n".
+            "If you are unable to upgrade, and are willing to accept the consequences, you may use the allowBadJSONSerialization()".
+            " method on the ClientBuilder to bypass this limitation.");
+        }
+
         $this->buildLoggers();
 
         if (is_null($this->handler)) {

src/Elasticsearch/Serializers/SmartSerializer.php

@@ -15,6 +15,13 @@
  */
 class SmartSerializer implements SerializerInterface
 {
+    private $PHP_VERSION;
+
+    public function __construct()
+    {
+        $this->PHP_VERSION = phpversion();
+    }
+
     /**
      * Serialize assoc array into JSON string
      *
@@ -27,7 +34,11 @@ public function serialize($data)
         if (is_string($data) === true) {
             return $data;
         } else {
-            $data = json_encode($data, JSON_PRESERVE_ZERO_FRACTION);
+            if (version_compare($this->PHP_VERSION, '5.6.6', '<') || ! defined('JSON_PRESERVE_ZERO_FRACTION')) {
+                $data = json_encode($data);
+            } else {
+                $data = json_encode($data, JSON_PRESERVE_ZERO_FRACTION);
+            }
             if ($data === '[]') {
                 return '{}';
             } else {