In what scenarios does the try..catch block in PHP only work if the PDO error handling is set to exceptions?

When using a try..catch block in PHP to handle exceptions thrown by PDO, the try..catch block will only work if the PDO error handling mode is set to exceptions. This is because PDO will throw exceptions when errors occur, which can then be caught and handled by the try..catch block. If the error mode is not set to exceptions, PDO will not throw exceptions and the try..catch block will not be able to catch any errors. 

// Set PDO to throw exceptions on error
$pdo = new PDO($dsn, $username, $password);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

try {
    // PDO code that may throw exceptions
} catch (PDOException $e) {
    // Handle PDO exceptions here
}

Keywords

try..catch block PHP PDO exceptions error handling

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