--- /dev/null
+<?php
+
+namespace Drupal\libraries\ExternalLibrary\PhpFile;
+
+/**
+ * Provides a PHP file loader using PHP's require_once.
+ *
+ * @todo Provide a separate PhpIncludeOnceLoader.
+ */
+class PhpRequireLoader implements PhpFileLoaderInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function load($file) {
+ // @todo Because libraries cannot be loaded twice it should be possible to
+ // use 'require' instead of 'require_once'.
+ /** @noinspection PhpIncludeInspection */
+ require_once $file;
+ }
+
+}