Enhance foreach tag to support dynamic variables (#4012)

src/Tags/Iterate.php

@@ -6,6 +6,16 @@ class Iterate extends Tags
 {
     protected static $aliases = ['foreach'];
 
+    /**
+     * Maps to the {{ iterate }} tag.
+     *
+     * @return mixed
+     */
+    public function index()
+    {
+        return $this->iterate($this->params->get('array'));
+    }
+
     /**
      * Maps to the {{ iterate:fieldname }} tag.
      *
@@ -15,10 +25,15 @@ class Iterate extends Tags
      * @return mixed
      */
     public function wildcard($tag)
+    {
+        return $this->iterate($this->context->get($tag));
+    }
+
+    protected function iterate($items)
     {
         [$keyKey, $valueKey] = $this->getKeyNames();
 
-        $items = collect($this->context->get($tag))
+        $items = collect($items)
             ->map(function ($value, $key) use ($keyKey, $valueKey) {
                 return [$keyKey => $key, $valueKey => $value];
             });