fix: preserve multiline

Author: dkarlovi

grammar/php.y

@@ -1267,13 +1267,19 @@ class_constant:
 
 array_short_syntax:
       '[' array_pair_list ']'
-          { $attrs = attributes(); $attrs['kind'] = Expr\Array_::KIND_SHORT;
+          { $attrs = attributes();
+            $attrs['kind'] = $this->isMultiline($attrs)
+                ? Expr\Array_::KIND_SHORT | Expr\Array_::KIND_MULTILINE
+                : Expr\Array_::KIND_SHORT;
             $$ = new Expr\Array_($2, $attrs); }
 ;
 
 dereferenceable_scalar:
       T_ARRAY '(' array_pair_list ')'
-          { $attrs = attributes(); $attrs['kind'] = Expr\Array_::KIND_LONG;
+          { $attrs = attributes();
+            $attrs['kind'] = $this->isMultiline($attrs)
+                ? Expr\Array_::KIND_LONG | Expr\Array_::KIND_MULTILINE
+                : Expr\Array_::KIND_LONG;
             $$ = new Expr\Array_($3, $attrs);
             $this->createdArrays->offsetSet($$); }
     | array_short_syntax

lib/PhpParser/ParserAbstract.php

@@ -1264,6 +1264,14 @@ private function isSimpleExit(array $args): bool {
         return false;
     }
 
+    protected function isMultiline(array $attributes): bool {
+        if (!isset($attributes['startLine']) || !isset($attributes['endLine'])) {
+            return false;
+        }
+
+        return $attributes['startLine'] !== $attributes['endLine'];
+    }
+
     /**
      * @param array<Node\Arg|Node\VariadicPlaceholder> $args
      * @param array<string, mixed> $attrs

test/code/prettyPrinter/stmt/arrays.test

@@ -17,6 +17,14 @@ $longMultiline = array(
 );
 -----
 $short = [1, 2, 3];
-$shortMultiline = [1, 2, 3];
+$shortMultiline = [
+    1,
+    2,
+    3,
+];
 $long = array(1, 2, 3);
-$longMultiline = array(1, 2, 3);
+$longMultiline = array(
+    1,
+    2,
+    3,
+);