Why Aren\'t My Custom MySQLi Connection Error Messages Displaying in PHP?

Custom Error Messages with MySQLi Connect Failure in PHP: A Comprehensive Guide

In your code snippet, you encounter an issue where a custom error message is not displayed when the MySQLi connection fails. Previously, PHP's mysql extension required manual error handling through if (!$conn) checks. However, with the advent of PHP 8.1, mysqli now throws exceptions on errors, eliminating the need for such explicit checks.

Why Custom Error Messages Are Not Displayed

In modern PHP versions, MySQLi automatically raises errors when a connection fails. Thus, the if (!$conn) statement is unnecessary and should be removed to allow the exception to be handled effectively.

Correcting the Code

To address the issue, you can update your code as follows:

function connectDatabase(){
    $dbServerName = 'local_host';
    $dbUsername = 'root';
    $dbPassword = '';
    $dbName = 'kishor_me';

    try {
        $conn = mysqli_connect($dbServerName, $dbUsername, $dbPassword, $dbName);
    } catch (Exception $e) {
        // Handle the connection error here
    }
}

Hiding Errors from Users

To conceal error messages from users, you can utilize PHP's display_errors configuration option:

ini_set('display_errors', 0);

Displaying User-Friendly Error Pages

For presenting a more user-friendly error page, you can implement an error handler:

set_exception_handler(function ($e)
{
    error_log($e);
    http_response_code(500);
    if (ini_get('display_errors')) {
        echo $e;
    } else {
        echo '<h1 id="Internal-Server-Error">500 Internal Server Error</h1><br>An internal server error has been occurred.<br>Please try again later.';
    }
});

Handling Connection Errors

When specific handling is required for connection errors, you can use try..catch blocks:

try {
    $conn = mysqli_connect($dbServerName, $dbUsername, $dbPassword, $dbName);
} catch (Exception $e) {
    // Handle the connection error here
}

Hiding Connection Credentials

To prevent database passwords from appearing in error messages, upgrade to PHP 8.2 or later.

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