Wrapper to convert a php site mysql_ procedural to mysqli_ without having to change any code where mysql_ procedural commands are no longer available. (migrating from php 5 to php 7)

mysqli2mysqli.php

<?php
// include this file somewhere that the entire project will have access to it, and disable the old mysql extension.

if(!function_exists('mysql_connect')) {
    function mysql_connect($server, $username, $password, $new_link=false) {
        return mysqli_connect($server, $username, $password );
    }

    function mysql_query( $query, $link_identifier ) {
        return mysqli_query($link_identifier, $query);
    }

    function mysql_select_db( $database_name, $link_identifier = NULL ) {
        return mysqli_select_db($link_identifier, $database_name);
    }

    function mysql_real_escape_string($unescaped_string, $link_identifier = NULL) {
        return mysqli_real_escape_string( $link_identifier, $unescaped_string );
    }

    function mysql_fetch_row($result) {
        return mysqli_fetch_row($result);
    }

    function mysql_close($link_identifier = NULL) {
        @mysqli_close($link_identifier);
    }

    function mysql_fetch_assoc($result) {
        return mysqli_fetch_assoc($result);
    }

    function mysql_result($result, $row, $field = 0) {
        $numrows = mysqli_num_rows($result);
        if ($numrows && $row <= ($numrows-1) && $row >=0){
            mysqli_data_seek($result,$row);
            $resrow = (is_numeric($field)) ? mysqli_fetch_row($result) : mysqli_fetch_assoc($result);
            if (isset($resrow[$field])){
                return $resrow[$field];
            }
        }
        return false;
    }
}