1 files changed, 24 insertions, 0 deletions
diff --git a/inc/arrayutil.inc.php b/inc/arrayutil.inc.php
new file mode 100644
index 00000000..ec6e2a5f
--- /dev/null
+++ b/inc/arrayutil.inc.php
@@ -0,0 +1,24 @@
+<?php
+
+class ArrayUtil
+{
+
+	/**
+	 * Take an array of arrays, take given key from each sub-array and return
+	 * new array with just those corresponding values.
+	 * @param array $list
+	 * @param string $key
+	 * @return array
+	 */
+	public static function flattenByKey($list, $key)
+	{
+		$ret = [];
+		foreach ($list as $item) {
+			if (array_key_exists($key, $item)) {
+				$ret[] = $item[$key];
+			}
+		}
+		return $ret;
+	}
+
+}
+\ No newline at end of file