fix(webklex): Add Header.has(), called by Part.isAttachment() #5267 from boite/fix-missing-has

fix(webklex): Add Header.has(), called by Part.isAttachment()

Author: freescout-help-desk

overrides/webklex/php-imap/src/Header.php

@@ -118,6 +118,16 @@ public function get($name) {
         return null;
     }
 
+    /**
+     * Check if a specific attribute exists
+     * @param string $name
+     *
+     * @return bool
+     */
+    public function has($name): bool {
+        return isset($this->attributes[$name]);
+    }
+
     /**
      * Set a specific attribute
      * @param string $name