From 5eaa4292c6db2c1ee1282c938c899dc5b88db65f Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 20 Apr 2020 11:49:17 +0200
Subject: [statistics] New filter UI

---
 inc/arrayutil.inc.php | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

(limited to 'inc')

diff --git a/inc/arrayutil.inc.php b/inc/arrayutil.inc.php
index ec6e2a5f..490b5a4f 100644
--- a/inc/arrayutil.inc.php
+++ b/inc/arrayutil.inc.php
@@ -10,7 +10,7 @@ class ArrayUtil
 	 * @param string $key
 	 * @return array
 	 */
-	public static function flattenByKey($list, $key)
+	public static function flattenByKey(array $list, string $key)
 	{
 		$ret = [];
 		foreach ($list as $item) {
@@ -21,4 +21,25 @@ class ArrayUtil
 		return $ret;
 	}
 
+	/**
+	 * Pass an array of arrays you want to merge. The keys of the outer array will become
+	 * the inner keys of the resulting array, and vice versa.
+	 * @param array $arrays
+	 * @return array
+	 */
+	public static function mergeByKey(array $arrays)
+	{
+		$empty = array_combine(array_keys($arrays), array_fill(0, count($arrays), false));
+		$out = [];
+		foreach ($arrays as $subkey => $array) {
+			foreach ($array as $key => $item) {
+				if (!isset($out[$key])) {
+					$out[$key] = $empty;
+				}
+				$out[$key][$subkey] = $item;
+			}
+		}
+		return $out;
+	}
+
 }
\ No newline at end of file
-- 
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