Criei uma class para fazer login, essa class utiliza um .php para fazer a conexão.
Arquivo Login.php
<?phpincluse("connect.php");classUser{//Resto do codigo aqui e a parte que dar erropublicfunctionlogin(){$sql="select * from login";result=mysqli_query($connect,$sql)ordie(mysqli_error());/*Aqui ele dis que nao reconhece a variavel $connect que é a variavel que vem do meu include connect.php por que ele nao reconhece? nao consigo comprender, em outros paginas que nao sao classes ele comprende a variavel perfeitamente.<i>"Undefined variable: connect on line xx"</i>*/}}?>
-- MySQL dump 10.13 Distrib 5.7.17, for Linux (x86_64)---- Host: localhost Database: php-- -------------------------------------------------------- Server version 5.7.17-0ubuntu0.16.04.1/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;/*!40101 SET NAMES utf8 */;/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;/*!40103 SET TIME_ZONE='+00:00' */;/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;---- Table structure for table `login`--DROP TABLE IF EXISTS `login`;/*!40101 SET @saved_cs_client = @@character_set_client */;/*!40101 SET character_set_client = utf8 */;CREATETABLE`login`(`id`int(11)NOTNULLAUTO_INCREMENT,`user`varchar(45)NOTNULL,`password`varchar(45)NOTNULL,PRIMARYKEY(`id`))ENGINE=InnoDBAUTO_INCREMENT=3DEFAULTCHARSET=latin1;/*!40101 SET character_set_client = @saved_cs_client */;---- Dumping data for table `login`--LOCK TABLES `login` WRITE;/*!40000 ALTER TABLE `login` DISABLE KEYS */;INSERTINTO`login`VALUES(1,'teste1','teste1'),(2,'teste2','teste2');/*!40000 ALTER TABLE `login` ENABLE KEYS */;UNLOCKTABLES;---- Dumping events for database 'php'------ Dumping routines for database 'php'--/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;-- Dump completed on 2017-02-18 12:03:58