What potential issues can arise when upgrading to PHP 7, specifically related to session_start() functionality?

When upgrading to PHP 7, a potential issue related to session_start() functionality is the use of deprecated session configuration options like session.bug_compat_42 and session.bug_compat_warn. To solve this issue, you should remove these deprecated options from your php.ini file and update your session configuration to use the newer options available in PHP 7. 

// Before upgrading to PHP 7
ini_set('session.bug_compat_42', 0);
ini_set('session.bug_compat_warn', 0);

// After upgrading to PHP 7
ini_set('session.use_strict_mode', 1);
ini_set('session.use_cookies', 1);
ini_set('session.use_only_cookies', 1);

Keywords

PHP 7 session_start() backward compatibility deprecated functions error handling

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