convert csv file to csv UTF8 by php

I got .csv file from client but when I read it with PHP, it show some text can't read. I try to upload and open with google sheet and then export .csv again with google. it work perfect when I read it with php.

Are there any way to convert .csv to .csv UTF8 without using google ? because client will send .csv to server everyday automatic. and then my php script will read and import .csv data into database. please help

Thanks