解析错误：语法错误，c中出现意外的“ $ query”（T_VARIABLE）

Question

我正在尝试将信息上传到数据库。我创建的页面是注册页面，用户可以在其中输入电子邮件用户名和密码。以下代码是我编写的数据库连接和上传代码。但我不断收到上述错误。有人可以告诉我我在想什么吗？

<?php 

	$db_host=
	$db_username=
	$db_pass=
	$db_name=
	
	$connectToServer =mysqli_query($host,$db_username,$db_pass) or die("server problem");
	$selectDb =mysqli_select_db($connectToServer,$db_name) or die("database not found");

if(isset($_POST['submit'])) {
	$username=$_POST['username'];
	$email=$_POST['eml'];
	$password =$_POST['password'];
	
	if(!empty($username)&&!empty($email)&&!empty($password)) {
		$username = striplashes($username);
		$email=striplashes($email);
		$password=striplashes($password);
		$username = mysql_real_escape_string($connectToServer,$username);

		$selectTable = "SELECT * FROM user_info WHERE username='$username'"
		$query = mysqli_query($connectToServer,$selectTable);
		$insert = "INSERT INTO user_info (username, email, password) VALUES ($username, $eml, $password)"
		$mquery = mysqli_query($connectToServer,,$insert);
		if ($mquery) {
		session_start();
		$_SESSION['login_user'] =$username ; 
		header("Location ; profile.php");
		}
		
	}
	else {
		echo <script>('please enter details')</script>;
		header("Location: register.html");
	}
}


?>

Answer 1

您在第22行缺少分号：

$selectTable = "SELECT * FROM user_info WHERE username='$username'"; // <- here

与第24行相同。

第25行上有一个多余的逗号... 而且您在第34行上缺少双引号...