note 108041 added to function.define

Some people like to have an ambiguous, engine-agnostic database include specified by assigning a single config variable to one of a series of constants. Unfortunately, this can easily become needlessly clunky if these defines are handled in an included config.php file, since more than one hook will throw an ugly "already defined" error. Here's a simple way to accomplish this architectural model without having to create a bunch of clumsy sanity checks that compromise scalability: <?php /* Available databases. --Kris */ $dbengines = array(); $dbengines[] = "mysql"; $dbengines[] = "mysqli"; $dbengines[] = "pgsql"; foreach ( $dbengines as $engine ) { if ( !defined( "_" . strtoupper( $engine ) . "_" ) ) { define( "_" . strtoupper( $engine ) . "_", $engine ); } } /* Which database engine shall we use? --Kris */ $sql_type = _MYSQLI_; ?> Then, somewhere later in the stack.... <?php /* Include the file with the desired sql class. --Kris */ require_once( $sql_type . ".php" ); /* Now you can use the same code for any supported db engine. --Kris */ $sql = new sql(); $res = $sql->query( .... ); ---- Server IP: 64.71.164.2 Probable Submitter: 173.10.123.113 ---- Manual Page -- http://www.php.net/manual/en/function.define.php Edit -- https://master.php.net/note/edit/108041 Del: integrated -- https://master.php.net/note/delete/108041/integrated Del: useless -- https://master.php.net/note/delete/108041/useless Del: bad code -- https://master.php.net/note/delete/108041/bad+code Del: spam -- https://master.php.net/note/delete/108041/spam Del: non-english -- https://master.php.net/note/delete/108041/non-english Del: in docs -- https://master.php.net/note/delete/108041/in+docs Del: other reasons-- https://master.php.net/note/delete/108041 Reject -- https://master.php.net/note/reject/108041 Search -- https://master.php.net/manage/user-notes.php