--- /dev/null
+<?php
+
+/*
+ * Copyright (c) 2013 Ben Ramsey <http://benramsey.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+namespace Symfony\Polyfill\Php55;
+
+/**
+ * @internal
+ */
+final class Php55ArrayColumn
+{
+ public static function array_column(array $input, $columnKey, $indexKey = null)
+ {
+ $output = array();
+
+ foreach ($input as $row) {
+ $key = $value = null;
+ $keySet = $valueSet = false;
+
+ if ($indexKey !== null && array_key_exists($indexKey, $row)) {
+ $keySet = true;
+ $key = (string) $row[$indexKey];
+ }
+
+ if ($columnKey === null) {
+ $valueSet = true;
+ $value = $row;
+ } elseif (is_array($row) && array_key_exists($columnKey, $row)) {
+ $valueSet = true;
+ $value = $row[$columnKey];
+ }
+
+ if ($valueSet) {
+ if ($keySet) {
+ $output[$key] = $value;
+ } else {
+ $output[] = $value;
+ }
+ }
+ }
+
+ return $output;
+ }
+}