I am currently running PHP 5.4.45 on my site, but WordPress is telling me that I need at least 5.6.20 or higher to run WordPress release 5.2.2. I remember having tried PHP 7 offline and it had done some weird things to CPT relationships.
Should I have any problem with my Toolset built site if I upgrade to PHP 7
It actually recommended to update to php version 7. I know our toolset plugin is compatible with this version but I cannot say the same for the other plugins that you may have installed.
So I would recommend doing this in a testing environment first.
I have updated all the plug-ins and still get an error:
Fatal error: Uncaught ArgumentCountError: Too few arguments to function item_title(), 1 passed in C:\xampp\htdocs\cuccr_s2019\wp-includes\class-wp-hook.php on line 288 and exactly 2 expected in C:\xampp\htdocs\cuccr_s2019\wp-content\plugins\check-in_check-out.php\check-in_check-out.php:9 Stack trace: #0 C:\xampp\htdocs\cuccr_s2019\wp-includes\class-wp-hook.php(288): item_title(16988) #1 C:\xampp\htdocs\cuccr_s2019\wp-includes\class-wp-hook.php(310): WP_Hook->apply_filters('', Array) #2 C:\xampp\htdocs\cuccr_s2019\wp-includes\plugin.php(465): WP_Hook->do_action(Array) #3 C:\xampp\htdocs\cuccr_s2019\wp-content\plugins\cred-frontend-editor\application\models\form\post.php(636): do_action('cred_save_data', 16988, Array) #4 C:\xampp\htdocs\cuccr_s2019\wp-content\plugins\cred-frontend-editor\application\models\form\base.php(441): CRED_Form_Post->save_form(16988) #5 C:\xampp\htdocs\cuccr_s2019\wp-content\plugins\cred-frontend-editor\application\controllers\form_builder_base.php(40): CRED_Form_Base->print_form() #6 C:\xampp\htdoc in C:\xampp\htdocs\cuccr_s2019\wp-content\plugins\check-in_check-out.php\check-in_check-out.php on line 9