PostgreSQL supports automatic character set conversion between server and client for certain character sets. pg_client_encoding() returns the client encoding as a string. The returned string will be one of the standard PostgreSQL encoding identifiers.
Note: This function requires PHP 4.0.3 or higher and PostgreSQL 7.0 or higher. If libpq is compiled without multibyte encoding support, pg_client_encoding() always returns SQL_ASCII. Supported encoding depends on PostgreSQL version. Refer to the PostgreSQL Documentation supported encodings.
The function used to be called pg_clientencoding().
PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().