[wp-trac] [WordPress Trac] #9915: Cannot activate plugin which override function from pluggable.php

[WordPress Trac]

#9915: Cannot activate plugin which override function from pluggable.php
--------------------------+-------------------------------------------------
 Reporter:  sirzooro      |       Owner:       
     Type:  defect (bug)  |      Status:  new  
 Priority:  normal        |   Milestone:  2.9  
Component:  General       |     Version:  2.7.1
 Severity:  normal        |    Keywords:       
--------------------------+-------------------------------------------------
 I have plugin which overrides some functions from pluggable.php file. It
 works fine on my development server (Apache, Windows, WP 2.7.1). On
 production server (Apache, Linux, WP 2.7.1) it cannot be activated - WP
 reports following error:

 Plugin could not be activated because it triggered a fatal error.
 Fatal error: Cannot redeclare wp_new_user_notification() (previously
 declared in /some/path/wp-includes/pluggable.php:1100) in /some/path/wp-
 content/plugins/plugin/plugin.php on line xxx

 I can workaround this by just checking if function already exists, which
 will allow to activate plugin. Unfortunately this is not a good solution -
 some other plugin can override this function too, so my plugin may stop
 working if it will be loaded after that one. I can add additional code to
 validate if functions are overridden - this can be checked in init hook,
 which is not called while plugin is installed.

 All of this is a bit complicated (preferred solution is to provide
 override functions only). Therefore I suggest to add new functions which
 will allow to register replacement functions like hooks now. See example
 code:
 {{{

 if ( !function_exists( 'some_function' ) ) :

 function some_function( $param ) {
         call_replacement_function( 'some_function', '_some_function',
 $param );
 }

 endif;

 function _some_function( $param ) {
 }

 }}}

 Plugin code:
 {{{

 register_replacement_function( 'some_function', 'new_fun' );

 function new_fun( $param ) {}

 }}}

 register_replacement_function() function should check if another
 replacement function is already registered and report error if there is
 one.

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Ticket URL: <http://core.trac.wordpress.org/ticket/9915>
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