How can one improve the error handling in the PHP code to display a specific error message when the username or password entered is incorrect?

To improve error handling in PHP code and display a specific error message when the username or password entered is incorrect, you can use conditional statements to check if the username and password match the expected values. If they do not match, you can set a custom error message to be displayed to the user. 

<?php
$expectedUsername = 'username';
$expectedPassword = 'password';

$userInputUsername = $_POST['username'];
$userInputPassword = $_POST['password'];

if ($userInputUsername !== $expectedUsername || $userInputPassword !== $expectedPassword) {
    echo "Incorrect username or password. Please try again.";
} else {
    echo "Login successful!";
}
?>

Keywords

try-catch exception handling error message authentication password validation

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