--- /dev/null
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\php\Plugin\views\argument_default\Php.
+ */
+
+namespace Drupal\php\Plugin\views\argument_default;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\views\Plugin\views\argument_default\ArgumentDefaultPluginBase;
+
+
+/**
+ * Default argument plugin to provide a PHP code block.
+ *
+ * @ViewsArgumentDefault(
+ * id = "php",
+ * module = "php",
+ * title = @Translation("PHP Code")
+ * )
+ */
+class Php extends ArgumentDefaultPluginBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function defineOptions() {
+ $options = parent::defineOptions();
+ $options['code'] = ['default' => ''];
+
+ return $options;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildOptionsForm(&$form, FormStateInterface $form_state) {
+ parent::buildOptionsForm($form, $form_state);
+ $form['code'] = [
+ '#type' => 'textarea',
+ '#title' => $this->t('PHP contextual filter code'),
+ '#default_value' => $this->options['code'],
+ '#description' => $this->t('Enter PHP code that returns a value to use for this filter. Do not use <?php ?>. You must return only a single value for just this filter. Some variables are available: the view object will be "$view". The argument handler will be "$argument", for example you may change the title used for substitutions for this argument by setting "argument->validated_title".'),
+ ];
+
+ // Only do this if using one simple standard form gadget.
+ $this->checkAccess($form, 'code');
+ }
+
+ /**
+ * Only let users with PHP block visibility permissions set/modify this
+ * default plugin.
+ */
+ public function access() {
+ return \Drupal::currentUser()->hasPermission('use PHP for settings');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getArgument() {
+ // Set up variables to make it easier to reference during the argument.
+ $view = &$this->view;
+ $argument = &$this->argument;
+ ob_start();
+ $result = eval($this->options['code']);
+ ob_end_clean();
+ return $result;
+ }
+
+}