What are the potential issues with using non-ASCII characters in variable names when working with MySQL and PDO in PHP?

Using non-ASCII characters in variable names when working with MySQL and PDO in PHP can lead to potential issues such as encoding problems, difficulty in debugging, and compatibility issues with certain database configurations. To avoid these problems, it is recommended to stick to ASCII characters for variable names. 

// Example of using ASCII characters for variable names
$first_name = "John";
$last_name = "Doe";

// PDO query using ASCII variable names
$stmt = $pdo->prepare("INSERT INTO users (first_name, last_name) VALUES (:first_name, :last_name)");
$stmt->bindParam(':first_name', $first_name);
$stmt->bindParam(':last_name', $last_name);
$stmt->execute();

Keywords

MySQL PDO PHP non-ASCII characters variable names

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