Why is it important to properly bind values in PDO queries to avoid errors in PHP?

When values are not properly bound in PDO queries, it leaves the application vulnerable to SQL injection attacks and can lead to unexpected errors in the database. Binding values ensures that the data is treated as data and not as SQL commands, preventing malicious input from affecting the query execution. 

// Example of properly binding values in a PDO query
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $username, PDO::PARAM_STR);
$stmt->execute();

Keywords

PDO bind values queries errors security

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