MAMP 无法建立数据库连接

Question

我正在尝试将多页表单中的数据保存到数据库中。我关注了 this tutorial 但连接总是失败。我不得不将功能从 mysql_connect 更改为 mysqli_connect，因为我是运行 PHP7，所以这可能是问题的一部分。这是代码：

<?php
  session_start();
  if (isset($_POST['state'])) {
  if (!empty($_SESSION['post'])){
  if (empty($_POST['address1'])
  || empty($_POST['city'])
  || empty($_POST['pin'])
  || empty($_POST['state'])){
  // Setting error for page 3.
  $_SESSION['error_page3'] = "Mandatory field(s) are missing, Please fill it again";
  header("location: finder-step-3.php"); // Redirecting to third page.
  } else {
  foreach ($_POST as $key => $value) {
  $_SESSION['post'][$key] = $value;
  }
  extract($_SESSION['post']); // Function to extract array.
  $connection = mysqli_connect("localhost", "root", "root");
  $db = mysqli_select_db($connection, "finder_form"); // Storing values in database.
  $query = mysqli_query($db, "insert into detail (name,email,contact,password,religion,nationality,gender,qualification,experience,address1,address2,city,pin,state) values('$name','$email','$contact','$password','$religion','$nationality','$gender','$qualification','$experience','$address1','$address2','$city','$pin','$state')", $connection);
  if ($query) {
  echo '<p><span id="success">Form Submitted successfully..!!</span></p>';
  } else {
  echo '<p><span>Form Submission Failed..!!</span></p>';
  }
  unset($_SESSION['post']); // Destroying session.
  }
  } else {
  header("location: finder-step-1.php"); // Redirecting to first page.
  }
  } else {
  header("location: finder-step-1.php"); // Redirecting to first page.
  }
  ?>

谁能发现我哪里出错了？提前致谢！

更新 1：

@Damon Swayn，我已将其更改为以下但仍然收到表单提交失败消息：

$connection = mysqli_connect("localhost", "root", "root", "finder_form");
  $query = mysqli_query($connection, "insert into detail (name,email,contact,password,religion,nationality,gender,qualification,experience,address1,address2,city,pin,state) values('$name','$email','$contact','$password','$religion','$nationality','$gender','$qualification','$experience','$address1','$address2','$city','$pin','$state')", $connection);
  if ($query) {
  echo '<p><span id="success">Form Submitted successfully..!!</span></p>';
  } else {
  echo '<p><span>Form Submission Failed..!!</span></p>';
  }

@lps，我在同一目录的 test.php 页面上设置了以下内容并成功连接：

<?php
$con = mysqli_connect('localhost', 'root', 'root') or die('Could not connect the database : Username or password incorrect');
mysqli_select_db($con, 'finder_form') or die ('No database found');
echo 'Database Connected successfully';
?>

更新 2：已解决

Damon Swayn 建议的更改奏效了，我只需要删除查询末尾的 $connection。这是工作代码：

$connection = mysqli_connect("localhost", "root", "root", "finder_form");
  $query = mysqli_query($connection, "insert into detail (name,email,contact,password,religion,nationality,gender,qualification,experience,address1,address2,city,pin,state) values('$name','$email','$contact','$password','$religion','$nationality','$gender','$qualification','$experience','$address1','$address2','$city','$pin','$state')");
  if ($query) {
  echo '<p><span id="success">Form Submitted successfully..!!</span></p>';
  } else {
  echo '<p><span>Form Submission Failed..!!</span></p>';
  }

Answer 1

mysqli_connect()可以带4个参数，第四个是数据库名。

您正在使用 mysqli_select_db() 的 return 值作为每个后续调用的连接参数，mysqli_select_db() return 是一个布尔值 true/false，请尝试将 mysqli_select_db() 之后的以下调用中的 $db 参数替换为 $connection 变量。

MAMP 无法建立数据库连接

MAMP can't establish database connection

php

mysql

mysqli

mamp

mamp-pro