Php 输入表单的问题

我创建了一个简单的表单，我想更新mysql数据库中的一些信息。我看这一切都很好，但我有一些错误

我有两个文件：

<?php

$db_name = "test2";
$un = "jharvard";
$pw = "crimson";
$host = "localhost";

$connect = mysql_connect($host, $un, $pw);
mysql_select_db($db_name) or die(mysql_error());

echo ("succesfully conneted to the database!");

?>

如果我运行它，我会得到以下错误：！警告：mysqli_查询要求参数1为mysqli，第16行的/home/jharvard/vhosts/pset7/public/oefInsertData.php中给出的资源

有人知道这里出了什么问题吗？

更换

<?php

$db_name = "test2";
$un = "jharvard";
$pw = "crimson";
$host = "localhost";

$connect = mysql_connect($host, $un, $pw);
mysql_select_db($db_name) or die(mysql_error());

echo ("succesfully conneted to the database!");

?>

与

您已经从mysql_uu切换到mysqli_uu，因此$connect不是mysqli参数。请使用mysqli_uconnect更改此参数。您正在同时使用mysql和myu sqli扩展

用这个

$connect = mysqli_connect($host, $un, $pw, $db_name);

避免

mysql_select_db($db_name) or die(mysql_error());

您必须从mysql切换到mysqli_

<?php

$db_name = "test2";
$un = "jharvard";
$pw = "crimson";
$host = "localhost";

$connect = mysql_connect($host, $un, $pw);
mysql_select_db($db_name) or die(mysql_error());

echo ("succesfully conneted to the database!");

?>

<?php
$con=mysqli_connect("localhost","jharvard","crimson","test2");

// Check connection
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
?>

$connect = mysqli_connect($host, $un, $pw, $db_name);

mysql_select_db($db_name) or die(mysql_error());

    <?php

$db_name = "test2";
$un = "jharvard";
$pw = "crimson";
$host = "localhost";
?>
and
<?php

if (isset($_POST['submitted']))
{
//Dit is de php file waarmee je connectie met de database maakt.
include ("addEmployee.php");
mysql_connect("$host", "$un", "$pw")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");

$fname = $_POST['fname'];
$lname = $_POST['lname'];

$query = mysql_query("INSERT INTO customers (name, address) VALUES ('{$fname}', '{$lname}')");
if(!$query){ echo mysql_error(); }

}


?>