How can the use of PDO and mysql_ functions be properly separated in PHP code?

The use of PDO and mysql_ functions should be properly separated in PHP code by choosing one method for interacting with the database and sticking to it throughout the codebase. Mixing the two can lead to inconsistencies, errors, and security vulnerabilities. To solve this issue, it is recommended to migrate all mysql_ functions to PDO for a more consistent and secure database interaction. 

// Example of properly separating PDO and mysql_ functions in PHP code

// Using PDO for database interaction
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Example of using PDO to fetch data
$stmt = $pdo->query('SELECT * FROM users');
while ($row = $stmt->fetch()) {
    echo $row['username'] . '<br>';
}

// Example of using mysql_ functions (deprecated)
$link = mysql_connect('localhost', 'username', 'password');
mysql_select_db('mydatabase', $link);

$result = mysql_query('SELECT * FROM users', $link);
while ($row = mysql_fetch_assoc($result)) {
    echo $row['username'] . '<br>';
}

Keywords

PDO mysql_ separation PHP code database operations

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