What are the differences between using if ($id){} and if (isset($id)){} in PHP scripts, and which is recommended for use?

Using `if ($id){}` checks if the variable `$id` has a truthy value, meaning it is not empty, null, false, or 0. On the other hand, `if (isset($id)) {}` checks if the variable `$id` is set and is not null. It is recommended to use `isset($id)` as it explicitly checks if the variable is set, avoiding potential errors related to uninitialized variables.

// Using isset to check if $id is set and not null
if (isset($id)) {
    // Code to execute if $id is set
}