What potential issues can arise when trying to retrieve cookie values in PHP?

One potential issue when trying to retrieve cookie values in PHP is that the cookie might not exist or have been set. To solve this, you can use the isset() function to check if the cookie is set before trying to retrieve its value. 

if(isset($_COOKIE['cookie_name'])){
    $cookie_value = $_COOKIE['cookie_name'];
    // Do something with the cookie value
} else {
    // Handle the case where the cookie is not set
}

Keywords

cookies PHP retrieval syntax errors

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