Merge branch '4.4' into 5.2

* 4.4:
  Use null coalescing operator instead of ternary operator

Author: OskarStark

components/property_access.rst

@@ -239,9 +239,7 @@ enable this feature by using :class:`Symfony\\Component\\PropertyAccess\\Propert
         {
             $property = lcfirst(substr($name, 3));
             if ('get' === substr($name, 0, 3)) {
-                return isset($this->children[$property])
-                    ? $this->children[$property]
-                    : null;
+                return $this->children[$property] ?? null;
             } elseif ('set' === substr($name, 0, 3)) {
                 $value = 1 == count($args) ? $args[0] : null;
                 $this->children[$property] = $value;
@@ -338,9 +336,7 @@ see `Enable other Features`_::
         {
             $property = lcfirst(substr($name, 3));
             if ('get' === substr($name, 0, 3)) {
-                return isset($this->children[$property])
-                    ? $this->children[$property]
-                    : null;
+                return $this->children[$property] ?? null;
             } elseif ('set' === substr($name, 0, 3)) {
                 $value = 1 == count($args) ? $args[0] : null;
                 $this->children[$property] = $value;

create_framework/http_foundation.rst

@@ -25,15 +25,15 @@ First, if the ``name`` query parameter is not defined in the URL query string,
 you will get a PHP warning; so let's fix it::
 
     // framework/index.php
-    $name = isset($_GET['name']) ? $_GET['name'] : 'World';
+    $name = $_GET['name'] ?? 'World';
 
     printf('Hello %s', $name);
 
 Then, this *application is not secure*. Can you believe it? Even this simple
 snippet of PHP code is vulnerable to one of the most widespread Internet
 security issue, XSS (Cross-Site Scripting). Here is a more secure version::
 
-    $name = isset($_GET['name']) ? $_GET['name'] : 'World';
+    $name = $_GET['name'] ?? 'World';
 
     header('Content-Type: text/html; charset=utf-8');
 

frontend/custom_version_strategy.rst

@@ -83,7 +83,7 @@ version string::
                 $this->hashes = $this->loadManifest();
             }
 
-            return isset($this->hashes[$path]) ? $this->hashes[$path] : '';
+            return $this->hashes[$path] ?? '';
         }
 
         public function applyVersion(string $path)