What are the potential pitfalls of transitioning from mysql_* to PDO in PHP?

When transitioning from mysql_* functions to PDO in PHP, potential pitfalls include differences in syntax and functionality between the two methods. To solve this issue, developers should carefully review and update their code to ensure compatibility with PDO, including adjusting queries, error handling, and connection management. 

// Example of transitioning from mysql_* to PDO in PHP

// Before transitioning
$conn = mysql_connect('localhost', 'username', 'password');
mysql_select_db('database', $conn);
$result = mysql_query('SELECT * FROM table', $conn);
while ($row = mysql_fetch_assoc($result)) {
    // Process data
}

// After transitioning to PDO
$dsn = 'mysql:host=localhost;dbname=database';
$username = 'username';
$password = 'password';

try {
    $conn = new PDO($dsn, $username, $password);
    $stmt = $conn->query('SELECT * FROM table');
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        // Process data
    }
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

Keywords

mysql_* PDO PHP database migration

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