How to Create a Secure and Error-Free PHP MySQL Code Sample?
Dec 14, 2024 am 03:30 AM
Perfect Code Sample Using the MySQL Extension
Problem:
In the quest to create a community learning resource for secure and error-free PHP database queries, this hypothetical problem presents the task of generating a perfect code sample using the MySQL extension. The goal is to tackle common issues such as SQL injection, error reporting, and XSS injection.
Solution:
To address the complexities of handling user inputs and ensuring data integrity, the provided solution prioritizes safety and simplicity.
<?php
header('Content-type: text/html; charset=utf-8');
error_reporting(E_ALL | E_STRICT);
ini_set('display_errors', 1);
$config = array(
'host' => '127.0.0.1',
'user' => 'my_user',
'pass' => 'my_pass',
'db' => 'my_database'
);
$connection = @mysql_connect($config['host'], $config['user'], $config['pass']);
if (!$connection) {
trigger_error('Unable to connect to database: ' . mysql_error(), E_USER_ERROR);
}
if (!mysql_select_db($config['db'])) {
trigger_error('Unable to select db: ' . mysql_error(), E_USER_ERROR);
}
if (!mysql_set_charset('utf8')) {
trigger_error('Unable to set charset for db connection: ' . mysql_error(), E_USER_ERROR);
}
$result = mysql_query(
'UPDATE tablename SET name = "'
. mysql_real_escape_string($_POST['name'])
. '" WHERE id = "'
. mysql_real_escape_string($_POST['id']) . '"'
);
if ($result) {
echo htmlentities($_POST['name'], ENT_COMPAT, 'utf-8') . ' updated.';
} else {
trigger_error('Unable to update db: ' . mysql_error(), E_USER_ERROR);
}
This code sample encapsulates the following key principles:
- Handles unicode character sets for a wider range of data types.
- Utilizes loose comparison to enhance readability.
- Establishes a database connection and selects a specific database for the operation.
- Safeguards against SQL injection by escaping user inputs using mysql_real_escape_string().
- Handles errors gracefully by using trigger_error() in case of failure, while suppressing error messages in production mode.
- Outputs the intended message upon successful completion of the database update.
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