diff --git a/htdocs/core/lib/json.lib.php b/htdocs/core/lib/json.lib.php
index 55b0085080fe2..0704f035848ec 100644
--- a/htdocs/core/lib/json.lib.php
+++ b/htdocs/core/lib/json.lib.php
@@ -23,49 +23,62 @@
  * 		\ingroup	core
  */
 
-
-/**
- * Implement json_encode for PHP that does not support it
- *
- * @param	mixed	$elements		PHP Object to json encode
- * @return 	string					Json encoded string
- */
-function json_encode($elements)
+if (! function_exists('json_encode'))
 {
-	$num = count($elements);
-
-	// determine type
-	if (is_numeric(key($elements)))
-	{
-		// indexed (list)
-		$output = '[';
-		for ($i = 0, $last = ($num - 1); isset($elements[$i]); ++$i)
-		{
-			if (is_array($elements[$i])) $output.= json_encode($elements[$i]);
-			else $output .= _val($elements[$i]);
-			if($i !== $last) $output.= ',';
-		}
-		$output.= ']';
-	}
-	else
+	/**
+	 * Implement json_encode for PHP that does not support it
+	 *
+	 * @param	mixed	$elements		PHP Object to json encode
+	 * @return 	string					Json encoded string
+	 */
+	function json_encode($elements)
 	{
-		// associative (object)
-		$output = '{';
-		$last = $num - 1;
-		$i = 0;
-		foreach($elements as $key => $value)
-		{
-			$output .= '"'.$key.'":';
-			if (is_array($value)) $output.= json_encode($value);
-			else $output .= _val($value);
-			if ($i !== $last) $output.= ',';
-			++$i;
-		}
-		$output.= '}';
+		return dol_json_encode($elements);
 	}
+}
 
-	// return
-	return $output;
+/**
+ * Implement json_encode for PHP that does not support it
+ *
+ * @param	mixed	$elements		PHP Object to json encode
+ * @return 	string					Json encoded string
+ */
+function dol_json_encode($elements)
+{
+	$num = count($elements);
+
+	// determine type
+	if (is_numeric(key($elements)))
+	{
+		// indexed (list)
+		$output = '[';
+		for ($i = 0, $last = ($num - 1); isset($elements[$i]); ++$i)
+		{
+			if (is_array($elements[$i])) $output.= json_encode($elements[$i]);
+			else $output .= _val($elements[$i]);
+			if($i !== $last) $output.= ',';
+		}
+		$output.= ']';
+	}
+	else
+	{
+		// associative (object)
+		$output = '{';
+		$last = $num - 1;
+		$i = 0;
+		foreach($elements as $key => $value)
+		{
+			$output .= '"'.$key.'":';
+			if (is_array($value)) $output.= json_encode($value);
+			else $output .= _val($value);
+			if ($i !== $last) $output.= ',';
+			++$i;
+		}
+		$output.= '}';
+	}
+
+	// return
+	return $output;
 }
 
 /**
@@ -174,58 +187,71 @@ function _val($val)
 	else  return 'null';
 }
 
-
-/**
- * Implement json_decode for PHP that does not support it
- *
- * @param	string	$json		Json encoded to PHP Object or Array
- * @param	bool	$assoc		False return an object, true return an array
- * @return 	mixed				Object or Array
- */
-function json_decode($json, $assoc=false)
+if (! function_exists('json_decode'))
 {
-	$comment = false;
-
-	$strLength = strlen($json);    // Must stay strlen and not dol_strlen because we want technical length, not visible length
-	for ($i=0; $i<$strLength; $i++)
+	/**
+	 * Implement json_decode for PHP that does not support it
+	 *
+	 * @param	string	$json		Json encoded to PHP Object or Array
+	 * @param	bool	$assoc		False return an object, true return an array
+	 * @return 	mixed				Object or Array
+	 */
+	function json_decode($json, $assoc=false)
 	{
-		if (! $comment)
-		{
-			if (($json[$i] == '{') || ($json[$i] == '[')) $out.= 'array(';
-			else if (($json[$i] == '}') || ($json[$i] == ']')) $out.= ')';
-			else if ($json[$i] == ':') $out.= ' => ';
-			else $out.=$json[$i];
-		}
-		else $out.= $json[$i];
-		if ($json[$i] == '"' && $json[($i-1)]!="\\") $comment = !$comment;
+		return dol_json_decode($json, $assoc);
 	}
-
-	$out=_unval($out);
-
-	// Return an array
-	eval('$array = '.$out.';');
-
-	// Return an object
-	if (! $assoc)
-	{
-		if (! empty($array))
-		{
-			$object = false;
-
-			foreach ($array as $key => $value)
-			{
-				$object->{$key} = $value;
-			}
-
-			return $object;
-		}
-
-		return false;
-	}
-
-	return $array;
 }
 
+/**
+ * Implement json_decode for PHP that does not support it
+ *
+ * @param	string	$json		Json encoded to PHP Object or Array
+ * @param	bool	$assoc		False return an object, true return an array
+ * @return 	mixed				Object or Array
+ */
+function dol_json_decode($json, $assoc=false)
+{
+	$comment = false;
+
+	$strLength = strlen($json);    // Must stay strlen and not dol_strlen because we want technical length, not visible length
+	for ($i=0; $i<$strLength; $i++)
+	{
+		if (! $comment)
+		{
+			if (($json[$i] == '{') || ($json[$i] == '[')) $out.= 'array(';
+			else if (($json[$i] == '}') || ($json[$i] == ']')) $out.= ')';
+			else if ($json[$i] == ':') $out.= ' => ';
+			else $out.=$json[$i];
+		}
+		else $out.= $json[$i];
+		if ($json[$i] == '"' && $json[($i-1)]!="\\") $comment = !$comment;
+	}
+
+	$out=_unval($out);
+
+	// Return an array
+	eval('$array = '.$out.';');
+
+	// Return an object
+	if (! $assoc)
+	{
+		if (! empty($array))
+		{
+			$object = false;
+
+			foreach ($array as $key => $value)
+			{
+				$object->{$key} = $value;
+			}
+
+			return $object;
+		}
+
+		return false;
+	}
+
+	return $array;
+}
 
 /**
  * Return text according to type
@@ -245,7 +271,6 @@ function _unval($val)
 	return $val;
 }
 
-
 /**
  * convert a string from one UTF-16 char to one UTF-8 char
  *
@@ -289,7 +314,6 @@ function utf162utf8($utf16)
 	return '';
 }
 
-
 /**
  * convert a string from one UTF-8 char to one UTF-16 char
  *
diff --git a/test/phpunit/FunctionsTest.php b/test/phpunit/FunctionsTest.php
index 82d0010bbe884..1c6f23193d910 100755
--- a/test/phpunit/FunctionsTest.php
+++ b/test/phpunit/FunctionsTest.php
@@ -378,12 +378,20 @@ public function testJsonEncode()
         $this->savdb=$db;
 
         $arraytotest=array(0=>array('key'=>1,'value'=>'PRODREF','label'=>'Product ref with é and special chars \\ \' "'));
+        
         $encoded=json_encode($arraytotest);
         //var_dump($encoded);
         $this->assertEquals('[{"key":1,"value":"PRODREF","label":"Product ref with \u00e9 and special chars \\\\ \' \""}]',$encoded);
         $decoded=json_decode($encoded,true);
         //var_dump($decoded);
         $this->assertEquals($arraytotest,$decoded);
+        
+        $encoded=dol_json_encode($arraytotest);
+        //var_dump($encoded);
+        $this->assertEquals('[{"key":1,"value":"PRODREF","label":"Product ref with \u00e9 and special chars \\\\ \' \""}]',$encoded);
+        $decoded=dol_json_decode($encoded,true);
+        //var_dump($decoded);
+        $this->assertEquals($arraytotest,$decoded);
     }
 }
 ?>
\ No newline at end of file