From 5bce147d90101f6e1c8bbde17090be326bec169a Mon Sep 17 00:00:00 2001
From: westi <westi@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
Date: Thu, 18 Mar 2010 21:24:07 +0000
Subject: [PATCH] Introduce apply_filters_ref_array(). See #9886 props scribu.

git-svn-id: http://svn.automattic.com/wordpress/trunk@13756 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/plugin.php | 55 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/wp-includes/plugin.php b/wp-includes/plugin.php
index bb41bd0ad..d88f6518b 100644
--- a/wp-includes/plugin.php
+++ b/wp-includes/plugin.php
@@ -173,6 +173,61 @@ function apply_filters($tag, $value) {
 	return $value;
 }
 
+/**
+ * Execute functions hooked on a specific filter hook, specifying arguments in an array.
+ *
+ * @see apply_filters() This function is identical, but the arguments passed to the
+ * functions hooked to <tt>$tag</tt> are supplied using an array.
+ *
+ * @package WordPress
+ * @subpackage Plugin
+ * @since 3.0
+ * @global array $wp_filter Stores all of the filters
+ * @global array $merged_filters Merges the filter hooks using this function.
+ * @global array $wp_current_filter stores the list of current filters with the current one last
+ *
+ * @param string $tag The name of the filter hook.
+ * @param array $args The arguments supplied to the functions hooked to <tt>$tag</tt>
+ * @return mixed The filtered value after all hooked functions are applied to it.
+ */
+function apply_filters_ref_array($tag, $args) {
+	global $wp_filter, $merged_filters, $wp_current_filter;
+
+	$wp_current_filter[] = $tag;
+
+	$value = $args[0];
+
+	// Do 'all' actions first
+	if ( isset($wp_filter['all']) ) {
+		$all_args = func_get_args();
+		_wp_call_all_hook($all_args);
+	}
+
+	if ( !isset($wp_filter[$tag]) ) {
+		array_pop($wp_current_filter);
+		return $value;
+	}
+
+	// Sort
+	if ( !isset( $merged_filters[ $tag ] ) ) {
+		ksort($wp_filter[$tag]);
+		$merged_filters[ $tag ] = true;
+	}
+
+	reset( $wp_filter[ $tag ] );
+
+	do {
+		foreach( (array) current($wp_filter[$tag]) as $the_ )
+			if ( !is_null($the_['function']) )
+				$value = call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
+
+	} while ( next($wp_filter[$tag]) !== false );
+
+	array_pop( $wp_current_filter );
+
+	return $value;
+}
+
 /**
  * Removes a function from a specified filter hook.
  *