How to insert unique data in php

How to insert non-duplicate data in php: first query the database; then use "value" as the query condition of the SQL statement; finally, set whether to insert data according to the queried data.

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Specific questions:

php determines whether there is a duplicate value in the system before inserting a certain value. If it is duplicated, it will prompt "duplicate value" and do not insert it; if it is not duplicated, the record will be inserted into the database. How to implement it with code?

Implementation method:

First use the value as the query condition of the SQL statement. If it can be found, the data will not be inserted

select field from table name where condition field = value; if the data is queried, do not insert it.

That is to say, first query the database select t_name from table where t_name='abcd'; If the value is queried, the data will definitely be returned. If the data can be returned, it will be true. If it cannot be false, new data will be inserted.

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