id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
18406,Check if pluggable function was already defined by other plugin,F J Kaiser,,"Currently there's no way to check if a pluggable function is already defined by some other plugin in a normal single site WP installation.

With the current design ""pluggables"" are only ''really pluggable'' for your own installations. Hosting a plugin the redefines a pluggable function in the official repository will only lead to lots of problems and unsatisfied/angry users that run into non-debugable errors.

The problem is that there's no standartized way to check if the function was already defined. Imho there ''should'' be a hook to allow for save checking if the function was defined and then throw something like a ''_doing_it_wrong();''-message, visible only for developers.

Sample plugin (for a multisite installation) to test and discuss this.


{{{
/*
Plugin Name:	___Pluggable Test
Plugin URI:		___
Description:	___
Author:			___
Author URI: 	___
Version:		0.1
License:		___
*/
function wp_rand( $min = 0, $max = 0 )
{
	return 'I am just a test';
}

function trac_test_the_hook()
{
	$title = 'pluggable test output';

	$msg  = 'The current filter is ""'.current_filter().'"" and works.';
	if ( function_exists( 'wp_rand' ) )
		$msg .= '<br />The function <em>""wp_rand()""</em> was already defined elsewhere.';

	wp_die( $msg, $title );
}
// Change the 'muplugins_loaded' to test other hooks
add_action( 'muplugins_loaded', 'trac_test_the_hook', 999 );
}}}


[1] [wp-hackers thread|https://groups.google.com/forum/?hl=de#!topic/wp-hackers/-EJbmkdMLjg]",enhancement,closed,normal,,Plugins,,normal,duplicate,,