How to Effectively Utilize `isset()` Within Nested Ternary Operators?

Understanding Nested Ternary Operators

To effectively utilize isset() within nested ternary operators, it's crucial to adhere to the following syntax:

(condition) ? (consequence) : (alternative)

When using multiple nested ternary operators, parentheses must enclose the entire expression for proper evaluation. Here's an example:

$selectedTemplate = isset($_POST['selectedTemplate'])
                  ? $_POST['selectedTemplate']
                  : (
                       isset($_GET['selectedTemplate'])
                       ? $_GET['selectedTemplate']
                       : 0
                  );

Alternatively, for improved maintainability, it's recommended to employ an if/else statement:

$selectTemplate = 0;

if (isset($_POST['selectedTemplate'])) {
    $selectTemplate = $_POST['selectedTemplate'];
} elseif (isset($_GET['selectedTemplate'])) {
    $selectTemplate = $_GET['selectedTemplate'];
}

Note that $_REQUEST simplifies the retrieval of form data:

$selectedTemplate = isset($_REQUEST['selectedTemplate'])
                  ? $_REQUEST['selectedTemplate']
                  : 0;

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