IHF: Email helpers added.

Author: dmitry-ivanov

src/email.php

@@ -0,0 +1,28 @@
+<?php
+
+if (!function_exists('is_email')) {
+    function is_email($string)
+    {
+        return filter_var($string, FILTER_VALIDATE_EMAIL);
+    }
+}
+
+if (!function_exists('to_rfc2822_email')) {
+    function to_rfc2822_email(array $addresses)
+    {
+        $result = [];
+
+        $addresses = !empty($addresses['address']) ? [$addresses] : $addresses;
+        foreach ($addresses as $item) {
+            if (!empty($item['address']) && is_email($item['address'])) {
+                if (!empty($item['name'])) {
+                    $result[] = "{$item['name']} <{$item['address']}>";
+                } else {
+                    $result[] = $item['address'];
+                }
+            }
+        }
+
+        return implode(', ', $result);
+    }
+}