What steps can be taken to troubleshoot a blank page issue after upgrading PHP versions?

When upgrading PHP versions, a common issue that can occur is a blank page being displayed instead of the expected content. This can be due to compatibility issues with the new PHP version and the codebase. To troubleshoot this issue, check for any syntax errors, deprecated functions, or changes in PHP configuration that may be causing the problem.

ini_set('display_errors', 1);
error_reporting(E_ALL);