note 54194 added to ref.classobj

((PHP5)) I wanted to dynamically choose an extender for a class. This took awhile of playing with it but I came up with a solution. Note that I can't verify how safe it is, but it appears to work for me. Perhaps someone else can shed light on the details: <?php class A { var $value = "Class A\n"; } class B { var $value = "Class B\n"; } // Uncomment which extender you want. You can use variables as well. // define('__EXTENDER__', 'A'); define('__EXTENDER__', 'B'); // Use eval to create a wrapper class. eval('class EXTENDER extends '. __EXTENDER__ . ' { }'); class C extends EXTENDER { function __construct() { echo $this->value; } } $t = new C; ?> Outputs: Class B Practical application: I have a database abstraction system that has individual classes for mysql, pgsql, et al. I want to be able to create a global db class that extends one of the individual db classes depending on the application configuration. I know that there are probably much better ways of doing this but I haven't reached that level when it comes to classes. ---- Manual Page -- http://www.php.net/manual/en/ref.classobj.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+54194 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+54194&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+54194&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+54194&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+54194&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+54194&report=yes&reason=non-english Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+54194&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+54194&report=yes Search -- http://master.php.net/manage/user-notes.php