How can PHP users effectively troubleshoot and resolve errors related to countable values in their code, particularly when transitioning between PHP versions like 7.2 and 7.3?

When transitioning between PHP versions like 7.2 and 7.3, users may encounter errors related to countable values due to changes in how count() handles non-countable values. To effectively troubleshoot and resolve these errors, users should check if the value is countable using the is_countable() function before calling count(). This ensures compatibility across different PHP versions.

// Check if the value is countable before calling count()
if (is_countable($value)) {
    $count = count($value);
} else {
    $count = 0;
}