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What are the best practices for debugging PHP code to identify errors like empty SESSION variables?

When debugging PHP code to identify errors like empty SESSION variables, it is important to check if the variable is set and not empty before using it. One way to do this is by using the isset() function to determine if the SESSION variable exists and is not null or empty.

php 
// Check if SESSION variable is set and not empty
if(isset($_SESSION['variable']) && !empty($_SESSION['variable'])) {
    // Proceed with using the SESSION variable
    $value = $_SESSION['variable'];
} else {
    // Handle the case when the SESSION variable is empty or not set
    echo "SESSION variable is empty or not set.";
}

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