diff --git a/core/modules/path/lib/Drupal/path/Controller/PathController.php b/core/modules/path/lib/Drupal/path/Controller/PathController.php
index a8fae4a..84f31d0 100644
--- a/core/modules/path/lib/Drupal/path/Controller/PathController.php
+++ b/core/modules/path/lib/Drupal/path/Controller/PathController.php
@@ -13,6 +13,7 @@
 class PathController {
 
   /**
+   * Controller routines for path routes.
    * @todo Remove path_admin_overview().
    */
   public function adminOverview($keys = NULL) {
@@ -21,6 +22,7 @@ public function adminOverview($keys = NULL) {
   }
 
   /**
+   * Controller routines for path routes.
    * @todo Remove path_admin_edit().
    */
   public function adminEdit($path) {
@@ -30,6 +32,7 @@ public function adminEdit($path) {
   }
 
   /**
+   * Controller routines for path routes.
    * @todo Remove path_admin_edit().
    */
   public function adminAdd() {
diff --git a/core/modules/path/lib/Drupal/path/Plugin/Field/FieldType/PathItem.php b/core/modules/path/lib/Drupal/path/Plugin/Field/FieldType/PathItem.php
index 8125ff9..e6a2cbc 100644
--- a/core/modules/path/lib/Drupal/path/Plugin/Field/FieldType/PathItem.php
+++ b/core/modules/path/lib/Drupal/path/Plugin/Field/FieldType/PathItem.php
@@ -17,7 +17,8 @@
  * @FieldType(
  *   id = "path",
  *   label = @Translation("Path"),
- *   description = @Translation("An entity field containing a path alias and related data."),
+ *   description = @Translation("An entity field containing
+ *   a path alias and related data."),
  *   configurable = FALSE
  * )
  */
diff --git a/core/modules/path/lib/Drupal/path/Tests/PathAliasTest.php b/core/modules/path/lib/Drupal/path/Tests/PathAliasTest.php
index e97101d..57fc914 100644
--- a/core/modules/path/lib/Drupal/path/Tests/PathAliasTest.php
+++ b/core/modules/path/lib/Drupal/path/Tests/PathAliasTest.php
@@ -19,6 +19,9 @@ class PathAliasTest extends PathTestBase {
    */
   public static $modules = array('path');
 
+  /**
+   * {@inheritdoc}
+   */
   public static function getInfo() {
     return array(
       'name' => 'Path alias functionality',
@@ -27,18 +30,25 @@ public static function getInfo() {
     );
   }
 
-  function setUp() {
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
     parent::setUp();
 
     // Create test user and login.
-    $web_user = $this->drupalCreateUser(array('create page content', 'edit own page content', 'administer url aliases', 'create url aliases'));
+    $web_user = $this->drupalCreateUser(array(
+      'create page content',
+      'edit own page content',
+      'administer url aliases',
+      'create url aliases'));
     $this->drupalLogin($web_user);
   }
 
   /**
    * Tests the path cache.
    */
-  function testPathCache() {
+  public function testPathCache() {
     // Create test node.
     $node1 = $this->drupalCreateNode();
 
@@ -69,7 +79,7 @@ function testPathCache() {
   /**
    * Tests alias functionality through the admin interfaces.
    */
-  function testAdminAlias() {
+  public function testAdminAlias() {
     // Create test node.
     $node1 = $this->drupalCreateNode();
 
@@ -88,9 +98,10 @@ function testAdminAlias() {
     $pid = $this->getPID($edit['alias']);
 
     $previous = $edit['alias'];
-    $edit['alias'] = "- ._~!$'\"()*@[]?&+%#,;=:" . // "Special" ASCII characters.
-      "%23%25%26%2B%2F%3F" . // Characters that look like a percent-escaped string.
-      "éøïвβ中國書۞"; // Characters from various non-ASCII alphabets.
+    // "Special" ASCII characters.
+    // Characters that look like a percent-escaped string.
+    // Characters from various non-ASCII alphabets.
+    $edit['alias'] = "- ._~!$'\"()*@[]?&+%#,;=:%23%25%26%2B%2F%3Féøïвβ中國書۞";
     $this->drupalPostForm('admin/config/search/path/edit/' . $pid, $edit, t('Save'));
 
     // Confirm that the alias works.
@@ -109,7 +120,7 @@ function testAdminAlias() {
 
     // Set alias to second test node.
     $edit['source'] = 'node/' . $node2->id();
-    // leave $edit['alias'] the same
+    // Leave $edit['alias'] the same.
     $this->drupalPostForm('admin/config/search/path/add', $edit, t('Save'));
 
     // Confirm no duplicate was created.
@@ -140,7 +151,7 @@ function testAdminAlias() {
   /**
    * Tests alias functionality through the node interfaces.
    */
-  function testNodeAlias() {
+  public function testNodeAlias() {
     // Create test node.
     $node1 = $this->drupalCreateNode();
 
@@ -162,9 +173,10 @@ function testNodeAlias() {
 
     // Change alias to one containing "exotic" characters.
     $previous = $edit['path[alias]'];
-    $edit['path[alias]'] = "- ._~!$'\"()*@[]?&+%#,;=:" . // "Special" ASCII characters.
-      "%23%25%26%2B%2F%3F" . // Characters that look like a percent-escaped string.
-      "éøïвβ中國書۞"; // Characters from various non-ASCII alphabets.
+    // "Special" ASCII characters.
+    // Characters that look like a percent-escaped string.
+    // Characters from various non-ASCII alphabets.
+    $edit['path[alias]'] = "- ._~!$'\"()*@[]?&+%#,;=:%23%25%26%2B%2F%3Féøïвβ中國書۞";
     $this->drupalPostForm('node/' . $node1->id() . '/edit', $edit, t('Save'));
 
     // Confirm that the alias works.
@@ -199,20 +211,21 @@ function testNodeAlias() {
   /**
    * Returns the path ID.
    *
-   * @param $alias
+   * @param string $alias
    *   A string containing an aliased path.
    *
    * @return int
    *   Integer representing the path ID.
    */
-  function getPID($alias) {
-    return db_query("SELECT pid FROM {url_alias} WHERE alias = :alias", array(':alias' => $alias))->fetchField();
+  public function getPID($alias) {
+    return db_query("SELECT pid FROM {url_alias} WHERE alias = :alias", array(
+      ':alias' => $alias))->fetchField();
   }
 
   /**
    * Tests that duplicate aliases fail validation.
    */
-  function testDuplicateNodeAlias() {
+  public function testDuplicateNodeAlias() {
     // Create one node with a random alias.
     $node_one = $this->drupalCreateNode();
     $edit = array();
diff --git a/core/modules/path/lib/Drupal/path/Tests/PathLanguageTest.php b/core/modules/path/lib/Drupal/path/Tests/PathLanguageTest.php
index 0653743..704c147 100644
--- a/core/modules/path/lib/Drupal/path/Tests/PathLanguageTest.php
+++ b/core/modules/path/lib/Drupal/path/Tests/PathLanguageTest.php
@@ -21,6 +21,9 @@ class PathLanguageTest extends PathTestBase {
    */
   public static $modules = array('path', 'locale', 'content_translation');
 
+  /**
+   * {@inheritdoc}
+   */
   public static function getInfo() {
     return array(
       'name' => 'Path aliases with translated nodes',
@@ -29,7 +32,10 @@ public static function getInfo() {
     );
   }
 
-  function setUp() {
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
     parent::setUp();
 
     $permissions = array(
@@ -76,7 +82,7 @@ function setUp() {
   /**
    * Test alias functionality through the admin interfaces.
    */
-  function testAliasTranslation() {
+  public function testAliasTranslation() {
     $english_node = $this->drupalCreateNode(array('type' => 'page', 'langcode' => 'en'));
     $english_alias = $this->randomName();
 
diff --git a/core/modules/path/lib/Drupal/path/Tests/PathLanguageUiTest.php b/core/modules/path/lib/Drupal/path/Tests/PathLanguageUiTest.php
index 5c97eff..7673794 100644
--- a/core/modules/path/lib/Drupal/path/Tests/PathLanguageUiTest.php
+++ b/core/modules/path/lib/Drupal/path/Tests/PathLanguageUiTest.php
@@ -19,6 +19,9 @@ class PathLanguageUiTest extends PathTestBase {
    */
   public static $modules = array('path', 'locale');
 
+  /**
+   * {@inheritdoc}
+   */
   public static function getInfo() {
     return array(
       'name' => 'Path aliases with languages',
@@ -27,11 +30,20 @@ public static function getInfo() {
     );
   }
 
-  function setUp() {
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
     parent::setUp();
 
     // Create and login user.
-    $web_user = $this->drupalCreateUser(array('edit any page content', 'create page content', 'administer url aliases', 'create url aliases', 'administer languages', 'access administration pages'));
+    $web_user = $this->drupalCreateUser(array(
+      'edit any page content',
+      'create page content',
+      'administer url aliases',
+      'create url aliases',
+      'administer languages',
+      'access administration pages'));
     $this->drupalLogin($web_user);
 
     // Enable French language.
@@ -48,7 +60,7 @@ function setUp() {
   /**
    * Tests that a language-neutral URL alias works.
    */
-  function testLanguageNeutralUrl() {
+  public function testLanguageNeutralUrl() {
     $name = $this->randomName(8);
     $edit = array();
     $edit['source'] = 'admin/config/search/path';
@@ -62,7 +74,7 @@ function testLanguageNeutralUrl() {
   /**
    * Tests that a default language URL alias works.
    */
-  function testDefaultLanguageUrl() {
+  public function testDefaultLanguageUrl() {
     $name = $this->randomName(8);
     $edit = array();
     $edit['source'] = 'admin/config/search/path';
@@ -77,7 +89,7 @@ function testDefaultLanguageUrl() {
   /**
    * Tests that a non-default language URL alias works.
    */
-  function testNonDefaultUrl() {
+  public function testNonDefaultUrl() {
     $name = $this->randomName(8);
     $edit = array();
     $edit['source'] = 'admin/config/search/path';
diff --git a/core/modules/path/lib/Drupal/path/Tests/PathTaxonomyTermTest.php b/core/modules/path/lib/Drupal/path/Tests/PathTaxonomyTermTest.php
index c483d9e..5b1c40f 100644
--- a/core/modules/path/lib/Drupal/path/Tests/PathTaxonomyTermTest.php
+++ b/core/modules/path/lib/Drupal/path/Tests/PathTaxonomyTermTest.php
@@ -19,6 +19,9 @@ class PathTaxonomyTermTest extends PathTestBase {
    */
   public static $modules = array('taxonomy');
 
+  /**
+   * {@inheritdoc}
+   */
   public static function getInfo() {
     return array(
       'name' => 'Taxonomy term URL aliases',
@@ -27,7 +30,10 @@ public static function getInfo() {
     );
   }
 
-  function setUp() {
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
     parent::setUp();
 
     // Create a Tags vocabulary for the Article node type.
@@ -38,14 +44,17 @@ function setUp() {
     $vocabulary->save();
 
     // Create and login user.
-    $web_user = $this->drupalCreateUser(array('administer url aliases', 'administer taxonomy', 'access administration pages'));
+    $web_user = $this->drupalCreateUser(array(
+      'administer url aliases',
+      'administer taxonomy',
+      'access administration pages'));
     $this->drupalLogin($web_user);
   }
 
   /**
    * Tests alias functionality through the admin interfaces.
    */
-  function testTermAlias() {
+  public function testTermAlias() {
     // Create a term in the default 'Tags' vocabulary with URL alias.
     $vocabulary = entity_load('taxonomy_vocabulary', 'tags');
     $description = $this->randomName();
diff --git a/core/modules/path/lib/Drupal/path/Tests/PathTestBase.php b/core/modules/path/lib/Drupal/path/Tests/PathTestBase.php
index 97f3f81..d3cd1b2 100644
--- a/core/modules/path/lib/Drupal/path/Tests/PathTestBase.php
+++ b/core/modules/path/lib/Drupal/path/Tests/PathTestBase.php
@@ -21,7 +21,10 @@
    */
   public static $modules = array('node', 'path');
 
-  function setUp() {
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
     parent::setUp();
 
     // Create Basic page and Article node types.
diff --git a/core/modules/path/path.admin.inc b/core/modules/path/path.admin.inc
index d22fe66..c8eeaff 100644
--- a/core/modules/path/path.admin.inc
+++ b/core/modules/path/path.admin.inc
@@ -102,10 +102,10 @@ function path_admin_overview($keys = NULL) {
 /**
  * Page callback: Returns a form creating or editing a path alias.
  *
- * @param $path
+ * @param string $path
  *   An array containing the path ID, source, alias, and language code.
  *
- * @return
+ * @return output
  *   A form for adding or editing a URL alias.
  *
  * @see path_menu()
@@ -129,7 +129,7 @@ function path_admin_edit($path = array()) {
 /**
  * Form constructor for the path administration form.
  *
- * @param $path
+ * @param string $path
  *   An array containing the path ID, source, alias, and language code.
  *
  * @ingroup forms
@@ -137,7 +137,11 @@ function path_admin_edit($path = array()) {
  * @see path_admin_form_submit()
  * @see path_admin_form_delete_submit()
  */
-function path_admin_form($form, &$form_state, $path = array('source' => '', 'alias' => '', 'langcode' => Language::LANGCODE_NOT_SPECIFIED, 'pid' => NULL)) {
+function path_admin_form($form, &$form_state, $path = array(
+  'source' => '',
+  'alias' => '',
+  'langcode' => Language::LANGCODE_NOT_SPECIFIED,
+  'pid' => NULL)) {
   $form['source'] = array(
     '#type' => 'textfield',
     '#title' => t('Existing system path'),
@@ -180,7 +184,7 @@ function path_admin_form($form, &$form_state, $path = array('source' => '', 'ali
   else {
     $form['langcode'] = array(
       '#type' => 'value',
-      '#value' => $path['langcode']
+      '#value' => $path['langcode'],
     );
   }
 
@@ -301,7 +305,7 @@ function path_admin_filter_form($form, &$form_state, $keys = '') {
     '#type' => 'submit',
     '#value' => t('Filter'),
     '#submit' => array('path_admin_filter_form_submit_filter'),
-    );
+  );
   if ($keys) {
     $form['basic']['reset'] = array(
       '#type' => 'submit',
diff --git a/core/modules/path/path.api.php b/core/modules/path/path.api.php
index c69b97d..6758d86 100644
--- a/core/modules/path/path.api.php
+++ b/core/modules/path/path.api.php
@@ -13,7 +13,7 @@
 /**
  * Respond to a path being inserted.
  *
- * @param $path
+ * @param string $path
  *   An associative array containing the following keys:
  *   - source: The internal system path.
  *   - alias: The URL alias.
@@ -34,7 +34,7 @@ function hook_path_insert($path) {
 /**
  * Respond to a path being updated.
  *
- * @param $path
+ * @param string $path
  *   An associative array containing the following keys:
  *   - source: The internal system path.
  *   - alias: The URL alias.
@@ -53,7 +53,7 @@ function hook_path_update($path) {
 /**
  * Respond to a path being deleted.
  *
- * @param $path
+ * @param string $path
  *   An associative array containing the following keys:
  *   - source: The internal system path.
  *   - alias: The URL alias.