Use negative index to access a character

app/Core/File.php

@@ -140,7 +140,7 @@ class File
             $matches[3] = $this->ext;
         } elseif (
             '(' === $matches[3][0]
-            && ')' === $matches[3][\strlen($matches[3]) - 1]
+            && ')' === $matches[3][-1]
         ) {
             $matches[3] = \explode('|', \substr($matches[3], 1, -1));
 

app/Core/Lang.php

@@ -284,7 +284,7 @@ class Lang
         if (
             isset($line[1])
             && '"' == $line[0]
-            && '"' == $line[\strlen($line) - 1]
+            && '"' == $line[-1]
         ) {
             $line = \substr($line, 1, -1);
         }