Add missing serializer in zInter args

Fixes GitHub issue phpredis#252

Author: nicolasff

redis.c

@@ -4284,7 +4284,7 @@ PHPAPI void generic_z_command(INTERNAL_FUNCTION_PARAMETERS, char *command, int c
                             "$%d" _NL
                             "%s" _NL
                             , cmd, cmd_len
-                            , Z_STRLEN_PP(data), Z_STRVAL_PP(data), Z_STRLEN_PP(data));
+                            , data_len, data_str, data_len);
             cmd_elements++;
 			if(free_data) efree(data_str);
             if(old_cmd) {

tests/TestRedis.php

@@ -2615,7 +2615,7 @@ protected function sequence($mode) {
 
 	    // sorted sets
 	    $ret = $this->redis->multi($mode)
-		    ->delete('zkey1', 'zkey2', 'zkey5')
+			->delete('zkey1', 'zkey2', 'zkey5', 'zInter', 'zUnion')
 		    ->zadd('zkey1', 1, 'zValue1')
 		    ->zadd('zkey1', 5, 'zValue5')
 		    ->zadd('zkey1', 2, 'zValue2')