add almost forgotten file: array_column.php

lib/array_column.php

@@ -0,0 +1,8 @@
+<?php
+function array_column(array $array, $column) {
+    $retval = array();
+    foreach ($array as $row) {
+        $retval[] = $row[$column];
+    }
+    return $retval;
+}