How can one avoid undefined variable errors when passing data through URLs in PHP?

When passing data through URLs in PHP, it is important to check if the variable is set before using it to avoid undefined variable errors. One way to do this is by using the isset() function to determine if the variable is set before accessing its value. 

// Check if the variable is set before using it
if(isset($_GET['variable_name'])) {
    $variable = $_GET['variable_name'];
    // Use the variable here
} else {
    // Handle the case when the variable is not set
}

Keywords

PHP URL parameters isset $_GET error handling

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