What are some common reasons for cookies set in PHP not being accessible in JavaScript, and how can these issues be troubleshooted?

One common reason for cookies set in PHP not being accessible in JavaScript is due to the domain and path settings of the cookie. To troubleshoot this, ensure that the domain and path settings are correctly specified when setting the cookie in PHP. Additionally, make sure that the cookie is being set before any output is sent to the browser.

// Set cookie with correct domain and path
setcookie('cookie_name', 'cookie_value', time() + 3600, '/', 'example.com');