Why Are My PDO Exceptions Throwing Null Values and Not Executing?

How to Handle PDO Exceptions

Problem:

While utilizing the PHP PDO class, attempts to handle errors lead to the code reporting null values and remaining inactive.

Code:

<code class="php">$connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // Exception handling is enabled

$id = 33;
$name = "Mario Bros.";
$url = "http://nintendo.com";
$country = "jp";

try {
    $sql = "UPDATE table_users SET name = :name, url = :url, country = :country WHERE user_id = :user_id";
    $statement = $connection->prepare($sql);
    $statement->bindParam(':user_id', trim($id), PDO::PARAM_INT);
    $statement->bindParam(':name', trim($name), PDO::PARAM_STR);
    $statement->bindParam(':url', trim($url), PDO::PARAM_STR);
    $statement->bindParam(':country', trim($country), PDO::PARAM_STR, 2);
    $status = $statement->execute();
} catch (PDOException $e) {
    echo $e->getMessage();
}</code>

Solution:

PDO does not throw exceptions automatically. To enable exception handling, the following line must be added before attempting to execute any queries:

<code class="php">$connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);</code>

Explanation:

By setting the PDO error mode to ERRMODE_EXCEPTION, all PDO-related errors will be thrown as exceptions. The try/catch block can then be used to handle these exceptions and provide meaningful error messages to users or logging systems.

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