Enhancement: Enable elseif fixer (#859)

Author: localheinz

.php-cs-fixer.php

@@ -28,6 +28,7 @@
             'spacing' => 'one',
         ],
         'constant_case' => true,
+        'elseif' => true,
         'increment_style' => [
             'style' => 'post',
         ],

include/layout.inc

@@ -212,9 +212,9 @@ function sect_to_file($string) {
     $feat = "features.$string.php";
     $struct = "control-structures.$string.php";
     if (@is_file($func)) return $func;
-    else if (@is_file($chap)) return $chap;
-    else if (@is_file($feat)) return $feat;
-    else if (@is_file($struct)) return $struct;
+    elseif (@is_file($chap)) return $chap;
+    elseif (@is_file($feat)) return $feat;
+    elseif (@is_file($struct)) return $struct;
     else return "$string.php";
 }