From 9eb97459679cd248804933cdf6d50d48ac19e7ed Mon Sep 17 00:00:00 2001
From: brettp <brettp@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Wed, 7 Jul 2010 16:30:35 +0000
Subject: Added elgg_sort_3d_array_by_value().  I do this often enough that a
 helper function will be nice.

git-svn-id: http://code.elgg.org/elgg/trunk@6657 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 engine/lib/elgglib.php | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'engine')

diff --git a/engine/lib/elgglib.php b/engine/lib/elgglib.php
index 385660d01..f41c87a7d 100644
--- a/engine/lib/elgglib.php
+++ b/engine/lib/elgglib.php
@@ -2410,6 +2410,37 @@ function elgg_get_array_value($key, array $array, $default = NULL) {
 	return (isset($array[$key])) ? $array[$key] : $default;
 }
 
+/**
+ * Sorts a 3d array by specific element.
+ * Will re-index numeric indexes.
+ * NB: This operates the same as the built-in sort functions.
+ * ie, sorts the array and returns a bool for success.
+ *
+ * Do this: elgg_sort_3d_array_by_value($my_array);
+ * Not this: $my_array = elgg_sort_3d_array_by_value($my_array);
+ *
+ * @param array $array Array to sort
+ * @param string $element Element to sort by
+ * @param $sort_order
+ * @param $sort_type
+ * @return bool
+ */
+function elgg_sort_3d_array_by_value(&$array, $element, $sort_order = SORT_ASC, $sort_type = SORT_LOCALE_STRING) {
+	$sort = array();
+	
+	foreach ($array as $k => $v) {
+		if (isset($v[$element])) {
+			$sort[] = strtolower($v[$element]);
+		} else {
+			$sort[] = NULL;
+		}
+	}
+
+	var_dump($sort, $array);
+	
+	return array_multisort($sort, $sort_order, $sort_type, $array);
+}
+
 /**
  * Some useful constant definitions
  */
-- 
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