add event for rendering header & footer

app/Events/RenderingFooter.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Events;
+
+class RenderingFooter extends Event
+{
+    public $contents;
+
+    /**
+     * Create a new event instance.
+     *
+     * @return void
+     */
+    public function __construct(array &$contents)
+    {
+        // pass array by reference
+        $this->contents = &$contents;
+    }
+
+    public function addContent($content)
+    {
+        if ($content) {
+            if (!is_string($content)) {
+                throw new \Exception("Can not add non-string content", 1);
+            }
+
+            $this->contents[] = $content;
+        }
+    }
+}

app/Events/RenderingHeader.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Events;
+
+class RenderingHeader extends Event
+{
+    public $contents;
+
+    /**
+     * Create a new event instance.
+     *
+     * @return void
+     */
+    public function __construct(array &$contents)
+    {
+        // pass array by reference
+        $this->contents = &$contents;
+    }
+
+    public function addContent($content)
+    {
+        if ($content) {
+            if (!is_string($content)) {
+                throw new \Exception("Can not add non-string content", 1);
+            }
+
+            $this->contents[] = $content;
+        }
+    }
+
+}

app/helpers.php

@@ -109,6 +109,12 @@ if (! function_exists('bs_footer')) {
         }
 
         echo '<script>'.Option::get("custom_js").'</script>';
+
+        $extra_contents = [];
+
+        Event::fire(new App\Events\RenderingFooter($extra_contents));
+
+        echo implode(PHP_EOL, $extra_contents);
     }
 }
 
@@ -130,6 +136,12 @@ if (! function_exists('bs_header')) {
         }
 
         echo '<style>'.Option::get("custom_css").'</style>';
+
+        $extra_contents = [];
+
+        Event::fire(new App\Events\RenderingHeader($extra_contents));
+
+        echo implode(PHP_EOL, $extra_contents);
     }
 }