How to check if a value is listed in a database using MySQL and PHP? -

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I was thinking how I can check whether a web page is listed in a database

How can I do this using PHP and MySQL?

Sorry if I'm ambiguous I'm new to PHP and MySQL.

A simple example. 

  & lt; Php $ db = mysql_connect ('host', 'user', 'pass'); $ Sql ​​= "Choose from your URL URL = 'http://example.com/foo'"; $ Qid = mysql_query ($ sql, $ db); If (mysql_num_rows ($ qid) == 0) {$ sql = "Include in your TABLE value ('http://example.com/foo')"; Mysql_query ($ sql, $ db); }

However after the mysql_connect () and mysql_query () functions you should check the error.

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