What are the best practices for handling undefined constants like "login" in PHP scripts?

When handling undefined constants like "login" in PHP scripts, it is best practice to check if the constant is defined before using it to avoid potential errors. This can be done using the defined() function in PHP. By checking if the constant is defined before using it, you can prevent errors and ensure that your code runs smoothly. 

if (defined('login')) {
    // Constant is defined, proceed with using it
    $username = login;
} else {
    // Constant is not defined, handle the case accordingly
    echo "Constant 'login' is not defined";
}

Keywords

undefined constants PHP scripts error handling best practices constants

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