I have installed a nulled version of woocommerce cart based shipping plugin, but it does not meet may needs, and then I have removed that plugin, however, the site is down. It keeps showing me the error, please help:
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I have met this issue while upgrading from PHP 5 to PHP 7 . I have checked all the problems and finally find out that it was mysqli PHP extension issue which was not enabled. If mysqli is not available WordPress 5+ detects this and will instead attempt to connect to the database with deprecated mysql_connect() calls. This will come out a misleading error message about mysql_connect() function not being available (since we don’t want this function).