note 78122 added to function.spl-autoload-register

The spl_autoload_register() method registers functions in its stack in the order that spl_autoload_register() was called, and subsequently if you want an autoload function to override previous autoload functions you will either need to unregister the previous ones or change the order of the autoload stack. For example, say in your default implementation of an autoload function you throw an exception if the class cannot be found, or perhaps a fatal error. Later on in your code you add a second implementation of an autoload function which will load a library that the previous method would fail on. This will not call the second autoloader method first, but rather will continue to error out on the first method. As previously mentioned, you can unregister the existing autoloader that errors out, or you can create a mechanism for unregistering and re-registering the autoloaders in the order you want. Here is a sample/example of how you might consider re-registering autoloaders so that the newest autoloader is called first, and the oldest last: <?php function spl_autoload_preregister( $autoload ) { // No functions currently in the stack. if ( ($funcs = spl_autoload_functions()) === false ) { spl_autoload_register($func); } else { // Unregister existing autoloaders... foreach ($funcs as $func) { spl_autoload_unregister($func); } // Register the new one, thus putting it at the front of the stack... spl_autoload_register($autoload); // Now, go back and re-register all of our old ones. foreach ($funcs as $func) { spl_autoload_register($func); } } } ?> Note: I have not tested this for overhead, so I am not 100% sure what the performance implication of the above example are. ---- Server IP: 69.147.83.197 Probable Submitter: 72.22.26.23 ---- Manual Page -- http://www.php.net/manual/en/function.spl-autoload-register.php Edit -- https://master.php.net/note/edit/78122 Del: integrated -- https://master.php.net/note/delete/78122/integrated Del: useless -- https://master.php.net/note/delete/78122/useless Del: bad code -- https://master.php.net/note/delete/78122/bad+code Del: spam -- https://master.php.net/note/delete/78122/spam Del: non-english -- https://master.php.net/note/delete/78122/non-english Del: in docs -- https://master.php.net/note/delete/78122/in+docs Del: other reasons-- https://master.php.net/note/delete/78122 Reject -- https://master.php.net/note/reject/78122 Search -- https://master.php.net/manage/user-notes.php