diff --git a/docs/guide-es/caching-data.md b/docs/guide-es/caching-data.md
index fadc323ead..6280c4b43e 100644
--- a/docs/guide-es/caching-data.md
+++ b/docs/guide-es/caching-data.md
@@ -9,7 +9,7 @@ El siguiente código muestra el típico patrón de uso para el almacenamiento en
 // intenta recuperar $data de la caché
 $data = $cache->get($key);
 
-if ($data === `false`) {
+if ($data === false) {
 
     // $data no ha sido encontrada en la caché, calcularla desde cero
 
@@ -160,7 +160,7 @@ $cache->set($key, $data, 45);
 sleep(50);
 
 $data = $cache->get($key);
-if ($data === `false`) {
+if ($data === false) {
     // $data ha caducado o no ha sido encontrado en la memoria caché
 }
 ```
diff --git a/docs/guide-es/concept-configurations.md b/docs/guide-es/concept-configurations.md
index 5a262b8005..3027a8266c 100644
--- a/docs/guide-es/concept-configurations.md
+++ b/docs/guide-es/concept-configurations.md
@@ -121,7 +121,7 @@ Cuando se utiliza [widgets](structure-widgets.md), a menudo es necesario utiliza
 use yii\widgets\Menu;
 
 echo Menu::widget([
-    'activateItems' => `false`,
+    'activateItems' => false,
     'items' => [
         ['label' => 'Home', 'url' => ['site/index']],
         ['label' => 'Products', 'url' => ['product/index']],
diff --git a/docs/guide-es/tutorial-core-validators.md b/docs/guide-es/tutorial-core-validators.md
index fe80e56a55..4a5fced2ac 100644
--- a/docs/guide-es/tutorial-core-validators.md
+++ b/docs/guide-es/tutorial-core-validators.md
@@ -32,8 +32,8 @@ A continuación, vamos a describir el uso principal y las propiedades de cada va
 
 Este validador comprueba si el valor de la entrada (input) es booleano.
 
-- ``true`Value`: El valor representando *`true`*. Valor por defecto a `'1'`.
-- ``false`Value`: El valor representando *`false`*. Valor por defecto a `'0'`.
+- `trueValue`: El valor representando `true`. Valor por defecto a `'1'`.
+- `falseValue`: El valor representando `false`. Valor por defecto a `'0'`.
 - `strict`: Si el tipo del valor de la entrada (input) debe corresponder con `trueValue` y `falseValue`. Valor por defecto a `false`.
 
 
diff --git a/docs/guide-fr/db-query-builder.md b/docs/guide-fr/db-query-builder.md
index a9522bf23b..72eb5cf84e 100644
--- a/docs/guide-fr/db-query-builder.md
+++ b/docs/guide-fr/db-query-builder.md
@@ -277,7 +277,7 @@ $query->filterWhere([
 
 La seule différence entre [[yii\db\Query::filterWhere()|filterWhere()]] et [[yii\db\Query::where()|where()]] est que la première ignore les valeurs vides fournies dans la condition au [format haché](#hash-format). Ainsi si `$email` est vide alors que `$username` ne l'est pas, le code ci dessus produit la condition SQL `WHERE username=:username`.
 
-> Info: une valeur est considérée comme vide si elle est `null`e, un tableau vide, ou un chaîne de caractères vide, ou un chaîne de caractères constituée d'espaces uniquement.
+> Info: une valeur est considérée comme vide si elle est nulle, un tableau vide, ou un chaîne de caractères vide, ou un chaîne de caractères constituée d'espaces uniquement.
 
 Comme avec [[yii\db\Query::andWhere()|andWhere()]] et [[yii\db\Query::orWhere()|orWhere()]], vous pouvez utiliser [[yii\db\Query::andFilterWhere()|andFilterWhere()]] et [[yii\db\Query::orFilterWhere()|orFilterWhere()]] pour ajouter des conditions de filtrage supplémentaires à une condition existante.
 
diff --git a/docs/guide-id/intro-upgrade-from-v1.md b/docs/guide-id/intro-upgrade-from-v1.md
index eb5015898f..df26874d4c 100644
--- a/docs/guide-id/intro-upgrade-from-v1.md
+++ b/docs/guide-id/intro-upgrade-from-v1.md
@@ -315,7 +315,7 @@ public function behaviors()
         'access' => [
             'class' => 'yii\filters\AccessControl',
             'rules' => [
-                ['allow' => `true`, 'actions' => ['admin'], 'roles' => ['@']],
+                ['allow' => true, 'actions' => ['admin'], 'roles' => ['@']],
             ],
         ],
     ];
diff --git a/docs/guide-it/intro-upgrade-from-v1.md b/docs/guide-it/intro-upgrade-from-v1.md
index f8c902fba9..2ecbb1616b 100644
--- a/docs/guide-it/intro-upgrade-from-v1.md
+++ b/docs/guide-it/intro-upgrade-from-v1.md
@@ -308,7 +308,7 @@ public function behaviors()
         'access' => [
             'class' => 'yii\filters\AccessControl',
             'rules' => [
-                ['allow' => `true`, 'actions' => ['admin'], 'roles' => ['@']],
+                ['allow' => true, 'actions' => ['admin'], 'roles' => ['@']],
             ],
         ],
     ];
diff --git a/docs/guide/structure-widgets.md b/docs/guide/structure-widgets.md
index fe1dbe7cf2..55ddb1f155 100644
--- a/docs/guide/structure-widgets.md
+++ b/docs/guide/structure-widgets.md
@@ -109,7 +109,7 @@ class HelloWidget extends Widget
     public function init()
     {
         parent::init();
-        if ($this->message === `null`) {
+        if ($this->message === null) {
             $this->message = 'Hello World';
         }
     }
diff --git a/docs/guide/tutorial-console.md b/docs/guide/tutorial-console.md
index 6317e9537b..0ab694e3bf 100644
--- a/docs/guide/tutorial-console.md
+++ b/docs/guide/tutorial-console.md
@@ -68,7 +68,7 @@ It contains code like the following:
  * Yii console bootstrap file.
  */
 
-defined('YII_DEBUG') or define('YII_DEBUG', `true`);
+defined('YII_DEBUG') or define('YII_DEBUG', true);
 defined('YII_ENV') or define('YII_ENV', 'dev');
 
 require(__DIR__ . '/vendor/autoload.php');
diff --git a/docs/guide/tutorial-core-validators.md b/docs/guide/tutorial-core-validators.md
index 44e8f2e4f9..f188282fcd 100644
--- a/docs/guide/tutorial-core-validators.md
+++ b/docs/guide/tutorial-core-validators.md
@@ -27,15 +27,15 @@ In the following, we will describe the main usage and properties of every core v
     ['selected', 'boolean'],
 
     // checks if "deleted" is of boolean type, either `true` or `false`
-    ['deleted', 'boolean', '`true`Value' => `true`, '`false`Value' => `false`, 'strict' => `true`],
+    ['deleted', 'boolean', 'trueValue' => true, 'falseValue' => false, 'strict' => true],
 ]
 ```
 
 This validator checks if the input value is a boolean.
 
-- ``true`Value`: the value representing *`true`*. Defaults to `'1'`.
-- ``false`Value`: the value representing *`false`*. Defaults to `'0'`.
-- `strict`: whether the type of the input value should match that of ``true`Value` and ``false`Value`. Defaults to `false`.
+- `trueValue`: the value representing `true`. Defaults to `'1'`.
+- `falseValue`: the value representing `false`. Defaults to `'0'`.
+- `strict`: whether the type of the input value should match that of `trueValue` and `falseValue`. Defaults to `false`.
 
 
 > Note: Because data input submitted via HTML forms are all strings, you normally should leave the
@@ -105,7 +105,7 @@ you can use a combination of compare and date validator like the following:
 ```php
 ['fromDate', 'date', 'timestampAttribute' => 'fromDate'],
 ['toDate', 'date', 'timestampAttribute' => 'toDate'],
-['fromDate', 'compare', 'compareAttribute' => 'toDate', 'operator' => '<', 'enableClientValidation' => `false`],
+['fromDate', 'compare', 'compareAttribute' => 'toDate', 'operator' => '<', 'enableClientValidation' => false],
 ```
 
 As validators are executed in the order they are specified this will first validate that the values entered in
@@ -153,7 +153,7 @@ or `1970-01-01` in the input field of a date picker.
 
 ```php
 [
-    [['from_date', 'to_date'], 'default', 'value' => `null`],
+    [['from_date', 'to_date'], 'default', 'value' => null],
     [['from_date', 'to_date'], 'date'],
 ],
 ```
@@ -271,7 +271,7 @@ This validator checks if the input value is a valid email address.
     ['a1', 'exist', 'targetAttribute' => ['a2', 'a1' => 'a3']],
 
     // a1 needs to exist. If a1 is an array, then every element of it must exist.
-    ['a1', 'exist', 'allowArray' => `true`],
+    ['a1', 'exist', 'allowArray' => true],
 ]
 ```
 
@@ -339,7 +339,7 @@ section for complete coverage about uploading files and performing validation ab
 ```php
 [
     // trim "username" and "email" inputs
-    [['username', 'email'], 'filter', 'filter' => 'trim', 'skipOnArray' => `true`],
+    [['username', 'email'], 'filter', 'filter' => 'trim', 'skipOnArray' => true],
 
     // normalize "phone" input
     ['phone', 'filter', 'filter' => function ($value) {
@@ -400,11 +400,11 @@ validation purpose:
 
     // checks if "ip_address" is a valid IPv6 address or subnet,
     // value will be expanded to full IPv6 notation.
-    ['ip_address', 'ip', 'ipv4' => `false`, 'subnet' => `null`, 'expandIPv6' => `true`],
+    ['ip_address', 'ip', 'ipv4' => false, 'subnet' => null, 'expandIPv6' => true],
 
     // checks if "ip_address" is a valid IPv4 or IPv6 address,
     // allows negation character `!` at the beginning
-    ['ip_address', 'ip', 'negation' => `true`],
+    ['ip_address', 'ip', 'negation' => true],
 ]
 ```
 
diff --git a/docs/guide/tutorial-i18n.md b/docs/guide/tutorial-i18n.md
index ed6bad36c4..8de8ce6e9b 100644
--- a/docs/guide/tutorial-i18n.md
+++ b/docs/guide/tutorial-i18n.md
@@ -496,7 +496,7 @@ class Module extends \yii\base\Module
         ];
     }
 
-    public static function t($category, $message, $params = [], $language = `null`)
+    public static function t($category, $message, $params = [], $language = null)
     {
         return Yii::t('modules/users/' . $category, $message, $params, $language);
     }
@@ -547,7 +547,7 @@ class Menu extends Widget
         echo $this->render('index');
     }
 
-    public static function t($category, $message, $params = [], $language = `null`)
+    public static function t($category, $message, $params = [], $language = null)
     {
         return Yii::t('widgets/menu/' . $category, $message, $params, $language);
     }
diff --git a/docs/guide/tutorial-performance-tuning.md b/docs/guide/tutorial-performance-tuning.md
index ab30754092..f3e7938813 100644
--- a/docs/guide/tutorial-performance-tuning.md
+++ b/docs/guide/tutorial-performance-tuning.md
@@ -27,7 +27,7 @@ You may place the following line of code at the beginning of the [entry script](
 disable debug mode:
 
 ```php
-defined('YII_DEBUG') or define('YII_DEBUG', `false`);
+defined('YII_DEBUG') or define('YII_DEBUG', false);
 ```
 
 > Info: The default value of `YII_DEBUG` is `false`. So if you are certain that you do not change its default
@@ -66,7 +66,7 @@ return [
             'dsn' => 'mysql:host=localhost;dbname=mydatabase',
             'username' => 'root',
             'password' => '',
-            'enableSchemaCache' => `true`,
+            'enableSchemaCache' => true,
 
             // Duration of schema cache.
             'schemaCacheDuration' => 3600,
@@ -121,7 +121,7 @@ component as the database connection and store the session data in the `session`
 
 ```sql
 CREATE TABLE session (
-    id CHAR(40) NOT `NULL` PRIMARY KEY,
+    id CHAR(40) NOT NULL PRIMARY KEY,
     expire INTEGER,
     data BLOB
 )
diff --git a/docs/guide/tutorial-template-engines.md b/docs/guide/tutorial-template-engines.md
index c287341448..3c6b56e4be 100644
--- a/docs/guide/tutorial-template-engines.md
+++ b/docs/guide/tutorial-template-engines.md
@@ -22,7 +22,7 @@ component's behavior:
                     'cachePath' => '@runtime/Twig/cache',
                     // Array of twig options:
                     'options' => [
-                        'auto_reload' => `true`,
+                        'auto_reload' => true,
                     ],
                     'globals' => ['html' => '\yii\helpers\Html'],
                     'uses' => ['yii\bootstrap'],