Question

我在phpmyadmin中创建了一个数据库。我正在尝试创建一个寄存器和登录，但我首先创建一个config.php文件，您可以在下面看到。我使用占位符而不是用户名和密码。然而，一旦加载网页，它只是说无法连接。

<?php
 $conn = mysqli_connect("localhost", "username", "password"); 
 if($conn){
    die("could not connect" . mysqli_error($conn));
  }

    mysqli_close($conn);
 ?>

我不确定我是否已连接到我的数据库，因为我是php新手。我已经创建了一个注册表单，但是只要我在url的末尾键入register.php它就会显示无法连接。它没有显示我的任何表单，并且控制台中没有错误。下面是我目前为register.php提供的php。我只是试着在那一刻测试它，但是html部分根本没有显示，所以我不能输入一个名字来查看它是否正常工作。

<?php 

require_once('config.php');

$username = $_POST ['username'];
?>

PHP位于html的head标签之前，用于register.php。有没有人对我的登记表格没有出现的原因有任何建议？

register.php

<?php 

require_once('config.php');

$username = $_POST ['username'];
?> 

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
        <meta name="description" content="">
        <meta name="author" content="">

        <title>Trip Guider</title>

        <!-- Bootstrap core CSS -->
        <link href="vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">

        <!-- Custom fonts for this template -->
        <link href="vendor/font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css">
        <link href='https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800' rel='stylesheet' type='text/css'>
        <link href='https://fonts.googleapis.com/css?family=Merriweather:400,300,300italic,400italic,700,700italic,900,900italic' rel='stylesheet' type='text/css'>

        <!-- Plugin CSS -->
        <link href="vendor/magnific-popup/magnific-popup.css" rel="stylesheet">

        <!-- Custom styles for this template -->
        <link href="css/creative.min.css" rel="stylesheet">
        <link href="css/style.css" rel="stylesheet">

    </head>

    <body id="page-top" >

        <!-- Navigation -->
        <nav class="navbar navbar-expand-lg navbar-light fixed-top" id="mainNav">
            <div class="container">
                <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
                    <span class="navbar-toggler-icon"></span>
                </button>
                <div class="collapse navbar-collapse" id="navbarResponsive">
                    <ul class="navbar-nav ml-auto">
                        <div class="dropdown" id="myDropdown">
                            <a class="btn dropdown-toggle" data-toggle="dropdown" href="#">
                                Menu

                                <span class="caret"></span>
                            </a>
                            <ul class="dropdown-menu">
                                <li><a href="#">Home</a></li>
                                <li><a href="gallery.html">View Holiday Gallery</a></li>
                                <li><a href="itinerary.html">View Itinerary</a></li>
                                <li><a href="settings.html">Settings</a></li>
                            </ul>
                        </div>

                    </ul>
                </div>
            </div>
        </nav>
        <div class="container">
            <div class="card card-container">
                <a href="index.html">
                    <img id="profile-img" class="profile-img-card" src="//ssl.gstatic.com/accounts/ui/avatar_2x.png" alt="logo" />
                </a>
                <p id="profile-name" class="profile-name-card"></p>
                <form class="form-signin" action="" method="post">

                    <input type="text" id="inputEmail" class="form-control" placeholder="Username" required autofocus>

                    <span id="reauth-email" class="reauth-email"></span>
                    <input type="email" id="inputEmail" class="form-control" placeholder="Email address" required autofocus>
                    <input type="password" id="inputPassword" class="form-control" placeholder="Password" required>

                    <button class="btn btn-lg btn-primary btn-block btn-signin" type="submit">Register</button>
                    <button class="btn btn-lg btn-primary btn-block btn-signin" type="submit">Sign in</button>
                </form><!-- /form -->
            </div><!-- /card-container -->
        </div><!-- /container -->
        <script src="js/creative.min.js"></script>
        <script src="js/jquery.js"></script>
    </body> 

</html>

Answer 1

首先打开PHP错误报告。紧跟<?php次叛徒后：

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

How do I get PHP errors to display?

Answer 2

问题来自连接脚本中的if语句; 你的'if'条件返回true而不是false，所以请改用它;

if（！$ conn）{

}

Answer 3

你在这里的陈述很糟糕：

 if($conn){
    die("could not connect" . mysqli_error($conn));
 }

您必须检查是否没有连接(!$conn)，因此正确的方法是：

if(!$conn){

    die("could not connect" . mysqli_error($conn));
 }

 else{

    //some code here

 }

Answer 4

试试这个：在config.php中你没有包含数据库名称

<?php
 $conn = mysqli_connect("localhost", "username", "password","dbname"); 
 if(!$conn){
    die("could not connect" . mysqli_error($conn));
  }

    mysqli_close($conn);
 ?>

将register.php更改为：

<?php 

require('config.php');

$username = $_POST ['username'];
?>

当使用php html注册表时没有出现

4 个答案: