How can you modify the code to properly check if a session variable is set in PHP 5?

To properly check if a session variable is set in PHP 5, you can use the isset() function along with the $_SESSION superglobal array. This function checks if a variable is set and is not NULL. By using isset() with $_SESSION, you can determine if a session variable has been set or not. 

session_start();

if(isset($_SESSION['variable_name'])) {
    // Session variable is set
    echo "Session variable is set.";
} else {
    // Session variable is not set
    echo "Session variable is not set.";
}

Keywords

PHP session variable isset error handling version 5

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