php objects patterns and practice

PHP Object-Oriented Learning Note 2: Design mode for generating objects 1. Singleton)If an application contains only one object at a time, this object is a singleton to replace global variables.Copy codeThe code is as follows: Require_once ("DB. php ");Class DatabaseConnection {Public static function get (){Static $ db = null;If ($ db = null)$ Db = new DatabaseC

1. Singleton)If an application contains only one object at a time, this object is a singleton to replace global variables. Copy codeThe Code is as follows: Require_once ("DB. php "); Class DatabaseConnection { Static $ db = null; If ($ db = null) $ Db = new DatabaseConnection (); Return $ db; } Private $ _ handle = null; $ Dsn = 'mysql: // root: password @ localhost/photos '; $ This-> _ handle = DB: Connect ($ dsn, array ()); } Public function handle

PHP4.0.6 above can access COM and DCOM objects in the Win32 platform. Here to borrow the ASP idea to visit SQL Server. Of course you can also use the MSSQL series function. If it is an ASP coder, you will feel the following code very familiar, accustomed to----without him, but PHP Changl ~_~: Author:erquan Date:2003-3-4 City: Zhengzhou $dbConn =new COM ("ADODB. Connection ") or Die (" Create COM Failed ")

1. Singleton)If an application contains only one object at a time, this object is a singleton to replace global variables.Copy codeThe Code is as follows:Require_once ("DB. php ");Class DatabaseConnection {Static $ db = null;If ($ db = null)$ Db = new DatabaseConnection ();Return $ db;}Private $ _ handle = null;$ Dsn = 'mysql: // root: password @ localhost/photos ';$ This-> _ handle = DB: Connect ($ dsn, array ());}Public function handle (){Return $