What is the significance of using isset() function when passing variables via URL in PHP?

When passing variables via URL in PHP, it is important to use the isset() function to check if the variable has been set before trying to access its value. This helps prevent errors and ensures that the code runs smoothly even if the variable is not present in the URL. 

// Check if the variable 'id' is set in the URL
if(isset($_GET['id'])){
    $id = $_GET['id'];
    // Use the variable $id safely in your code
    echo "ID passed via URL: " . $id;
} else {
    echo "No ID passed via URL";
}

Keywords

isset function variables URL PHP

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