MySQL deprecated in PHP 5.5.0, and removed in PHP 7.0.0. For a large and old application, this is difficult to search and replace each function.
We can use MySQL functions by creating a wrapper function for each below is running code. <a href="https://www.talkforweb.com.au/php/how-to-use-mysql-in-php-7-version">Click here</a>
Overview of the MySQL PHP drivers
Introduction
There are several PHP APIs for accessing the MySQL database. Users can choose between the mysqli or PDO_MySQL extensions.
This guide explains the terminology used to describe each API, information about choosing which API to use, and also information to help choose which MySQL library to use with the API.
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