How to query a field in mysql table in php

How to query a field in php: first connect to the server and connect to the available database on the server; then select the database for operation; then set the encoding; finally query through the "mysql_query($sql,$my_conn);" method That’s it.

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Specific questions:

There is a table of members. How to query the tel value in the user table username=1234. I only want to display this value

Implementation method:

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