Questions about using mysqli to extend the query results of phpmysql extension

Why does phpmysql extension use mysqli to extend the query results? background: replace mysql extension in the system with mysqli extension. Problem: Due to code staggered, the mysql_fetch_array () function is used in many cases, while mysql_fetch_array () is used in mysqli_query () the parameter of the function is the problem that the resou php mysql extension uses mysqli to extend the query result.
Background:
Change the mysql extension in the system to mysqli extension.

Problems:
Because the code is staggered, the mysql_fetch_array () function using mysqli_query () is used in many cases. the parameters of mysql_fetch_array () function are resource-type, and mysqli_query () the result returned by the function is of the mysqli_result type. Therefore, there are many "mysql_fetch_array () expects parameter 1 to be resource, object given .... "alarm.

Is there a solution? can I convert mysqli_result into a valid resource?

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I used to modify the code. Fortunately, there are not many codes, but mysql is actually used.
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I think it would be nice to change it to the same one.
In fact, there will still be a lot of problems in the future. what if the database is changed to oracle ??
We recommend that you use the same interface, for example, the PDO operation.
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Discussion

The key is that I have too many codes.
Reference:

I used to modify the code. Fortunately, there are not many codes, but mysql is actually used.