Php + js

In php + js, how does one query text by the first letter? In php + js, how does one query text by the first letter? Similar to the query results on the google homepage, convert Chinese characters to the first letter, and then convert Chinese characters to the first letter during the query. check how many php + js files on the Internet can be used to query text by the first letter?
In php + js, how does one query text by the first letter?
Similar to google homepage query results


------ Solution --------------------
Convert Chinese characters into the first letter, and then convert Chinese characters into the first letter in the query.