Upgrade to Kirby 3

site/plugins/columns/index.php

@@ -0,0 +1,27 @@
+<?php
+# copied at 2021-01-23 from https://getkirby.com/docs/cookbook/extensions/columns-in-kirbytext
+
+Kirby::plugin('kirby/columns', [
+  'hooks' => [
+    'kirbytags:before' => function ($text, array $data = []) {
+
+      $text = preg_replace_callback('!\(columns(…|\.{3})\)(.*?)\((…|\.{3})columns\)!is', function($matches) use($text, $data) {
+
+        $columns        = preg_split('!(\n|\r\n)\+{4}\s+(\n|\r\n)!', $matches[2]);
+        $html           = [];
+        $classItem      = $this->option('kirby.columns.item', 'column');
+        $classContainer = $this->option('kirby.columns.container', 'columns');
+
+        foreach ($columns as $column) {
+            $html[] = '<div class="' . $classItem . '">' . $this->kirbytext($column, $data) . '</div>';
+        }
+
+        return '<div class="' . $classContainer . '">' . implode($html) . '</div>';
+
+      }, $text);
+
+      return $text;
+    }
+
+  ]
+]);