How can undefined variable notices be prevented when using $_GET in PHP?

When using $_GET in PHP, undefined variable notices can be prevented by checking if the variable is set using the isset() function before trying to access its value. This ensures that the variable exists before attempting to use it in your code. 

if(isset($_GET['variable_name'])){
    $variable = $_GET['variable_name'];
    // Use the variable in your code
} else {
    // Handle the case when the variable is not set
}

Keywords

PHP $_GET error handling isset() undefined variable

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