php update

composer.json

@@ -13,7 +13,7 @@
   ],
   "require": {
     "ext-json": "*",
-    "php": ">=7.2"
+    "php": ">=7.1"
   },
   "require-dev": {
     "phpunit/phpunit": "8.3.5"

src/Mapper/Map.php

@@ -44,7 +44,7 @@ public function containsObjectPath($objectPath)
      */
     public function get($objectPath)
     {
-        return isset($this->map[$objectPath]) ? $this->map[$objectPath] : null;
+        return $this->map[$objectPath] ?? null;
     }
 
     /**

src/Mapper/MapFactory.php

@@ -24,7 +24,7 @@ public static function create(array $mapSchema)
         foreach ($mapSchema as $key => $value) {
             $tags = [];
             if (strpos($key, ':') !== false) {
-                list($key, $tags) = explode(':', $key);
+                [$key, $tags] = explode(':', $key);
                 $tags = self::normaliseTags($tags);
             }
             $map->add(new MapItem($key, $value, $tags));
@@ -82,7 +82,7 @@ protected static function tagsFromString($tags)
             if (strpos($tag, ' ') !== false) {
                 list($tag, $value) = explode(' ', $tag);
             }
-            $result[$tag] = isset($value) ? $value : true;
+            $result[$tag] = $value ?? true;
         }
         return $result;
     }