为什么会出现解析错误？

Question

I have an HTML page with a simple form on it that submits data to login.php. Inside of login.php I have this code. When I try to execute this script I get this error:

Parse error: syntax error, unexpected T_VARIABLE in /home/login.php on line 13

<?php

$username = $_POST['login'];
$password = $_POST['password'];

if ($username&&$password) {

    $connect = mysql_connect("localhost", "admin", "1455m") or die("Couldn't Connect");
    mysql_select_db("lr") or die("Couldn't find database!");

    $query = mysql_query("SELECT * FROM users WHERE username='$username'")

    $numrows = mysql_num_rows($query);

    if ($numrows!=0) {

        while ($row = mysql_fetch_assoc($query)) {

            $dbusername = $row['username'];
            $dbpassword = $row['password'];
        }

        if ($username==$dbusername&&$password==$dbpassword) {

            echo 'You are In!';

        } else {

            echo 'Incorrect Password!';
        }

    } else {
        die("That user doesn't exist.");
    }

} else {
    die("Please enter a username & password.");
}

?>

Answer 1

You're missing a semicolon:

$query = mysql_query("SELECT * FROM users WHERE username='$username'") 
                                                                      ^
                                                                      Here

Answer 2

That error is telling you that something on line 13 was unexpected; in this case a variable. So usually it's a good idea to check the code that comes before it and check that it's syntactically correct.

In this case you're missing a semi-colon on the line proceeding line 13, so line 11 due to your formatting - just where you use mysql_query()! Try this...

$connect = mysql_connect("localhost", "admin", "1455m") or die("Coudn't Connect");
mysql_select_db("lr") or die("Coudn't find database!");

$query = mysql_query("SELECT * FROM users WHERE username='$username'"); // here!

$numrows = mysql_num_rows($query);

Answer 3

You are forgetting to add the connection in the query:

$query = mysql_query("SELECT * FROM users WHERE username='$username'");

should be:

$result = mysql_query("SELECT * FROM users WHERE username='$username'", $connect);