Fix Wordpress Issues Possibly Caused by PHP version update

Fix Wordpress Issues Possibly Caused by PHP version update

I recently updated my hosting PHP version and one of the hosted sites seems to be affected by this process. It would load normally on some devices or and browsers, load with errors on other browsers and devices or would not load and show the following error messages on certain devices or and browsers:

The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /home/*****/public_html/wp-includes/wp-db.php on line #

Warning: Cannot modify header information - headers already sent by (output started at /home/*****/public_html/wp-includes/wp-db.php:1562) in /home/*****/public_html/wp-admin/includes/misc.php on line #

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Requirements

I would like to hire an expert who can look into the issue (the error messages and the issues listed in the description section of this job) and provide an immediate solution.

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Skills Required

Mysql Php