What best practices should be followed when handling PHP GET variables in conditional statements?

When handling PHP GET variables in conditional statements, it is important to validate and sanitize the input to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. Always check if the GET variable is set before using it in a conditional statement to avoid errors. Additionally, consider using type casting or strict comparison operators to ensure the data type and value are what you expect. 

// Example of handling PHP GET variables in conditional statements
if(isset($_GET['id']) && is_numeric($_GET['id'])) {
    $id = (int)$_GET['id'];
    
    // Use the $id variable safely in your code
} else {
    // Handle the case when the GET variable is not set or is not a valid number
}

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