What is the importance of checking and displaying session variables in PHP applications?

It is important to check and display session variables in PHP applications to ensure that the correct data is being stored and accessed throughout a user's session. This helps in maintaining data integrity and security within the application. By displaying session variables, developers can easily debug and track the flow of data in their application. 

<?php
session_start();

// Check if a specific session variable exists
if(isset($_SESSION['user_id'])) {
    // Display the value of the session variable
    echo "User ID: " . $_SESSION['user_id'];
} else {
    echo "User ID not found in session.";
}
?>

Keywords

session variables PHP applications security data validation error handling

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