How does the isset() function work in PHP and how is it used in the given code snippet?

The isset() function in PHP is used to determine if a variable is set and is not NULL. In the given code snippet, the isset() function is used to check if the $_GET['id'] variable is set before using it to prevent any potential errors or warnings if the variable is not set. This helps ensure that the code executes without any issues related to undefined variables. 

if(isset($_GET['id'])) {
    $id = $_GET['id'];
    // further code that uses the $id variable
} else {
    // handle the case when $_GET['id'] is not set
}

Keywords

isset function PHP code snippet usage

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