sql_set_charset() function requests the usage of the specified encoding for transactions between PHP and the database manager.
sql_set_charset() accepts three parameters. Only the first is required:
$charsetis the requested charset, such as "utf8"
This function is called immediately after each connection to the database server in order to specify the charset to be employed. This encoding selection is defined elsewhere in the
charset_sql_connexion meta variable created during the installation of SPIP.