What potential pitfalls should be avoided when using isset to check for NULL values in PHP?

Using isset to check for NULL values in PHP can lead to potential pitfalls because isset only checks if a variable is set and not NULL. To accurately check for NULL values, it's better to use the strict comparison operator === with NULL. This ensures that the value is both set and specifically NULL. 

// Avoid using isset to check for NULL values
$variable = NULL;
if (isset($variable)) {
    echo "Variable is set";
} else {
    echo "Variable is not set";
}

// Use strict comparison with NULL to check for NULL values
$variable = NULL;
if ($variable === NULL) {
    echo "Variable is NULL";
} else {
    echo "Variable is not NULL";
}

Keywords

isset NULL values PHP error handling data validation

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