fix: preserve array multiline mode

grammar/php.y

@@ -1226,13 +1226,19 @@ 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;
             $$ = new Expr\Array_($3, $attrs);
             $this->createdArrays->attach($$); }
     | array_short_syntax                                    { $$ = $1; $this->createdArrays->attach($$); }

lib/PhpParser/Node/Expr/Array_.php

@@ -9,6 +9,7 @@ class Array_ extends Expr {
     // For use in "kind" attribute
     public const KIND_LONG = 1;  // array() syntax
     public const KIND_SHORT = 2; // [] syntax
+    public const KIND_MULTILINE = 4; // force multiline formatting
 
     /** @var ArrayItem[] Items */
     public array $items;

lib/PhpParser/Parser/Php7.php

@@ -2564,11 +2564,17 @@ protected function initReduceCallbacks(): void {
                  $self->semValue = new Expr\ClassConstFetch($self->semStack[$stackPos-(3-1)], new Expr\Error($self->getAttributes($self->tokenStartStack[$stackPos-(3-3)],  $self->tokenEndStack[$stackPos-(3-3)])), $self->getAttributes($self->tokenStartStack[$stackPos-(3-1)], $self->tokenEndStack[$stackPos])); $self->errorState = 2;
             },
             547 => static function ($self, $stackPos) {
-                 $attrs = $self->getAttributes($self->tokenStartStack[$stackPos-(3-1)], $self->tokenEndStack[$stackPos]); $attrs['kind'] = Expr\Array_::KIND_SHORT;
+                 $attrs = $self->getAttributes($self->tokenStartStack[$stackPos-(3-1)], $self->tokenEndStack[$stackPos]);
+            $attrs['kind'] = $self->isMultiline($attrs)
+                ? Expr\Array_::KIND_SHORT | Expr\Array_::KIND_MULTILINE
+                : Expr\Array_::KIND_SHORT;
             $self->semValue = new Expr\Array_($self->semStack[$stackPos-(3-2)], $attrs);
             },
             548 => static function ($self, $stackPos) {
-                 $attrs = $self->getAttributes($self->tokenStartStack[$stackPos-(4-1)], $self->tokenEndStack[$stackPos]); $attrs['kind'] = Expr\Array_::KIND_LONG;
+                 $attrs = $self->getAttributes($self->tokenStartStack[$stackPos-(4-1)], $self->tokenEndStack[$stackPos]);
+            $attrs['kind'] = $self->isMultiline($attrs)
+                ? Expr\Array_::KIND_LONG | Expr\Array_::KIND_MULTILINE
+                : Expr\Array_::KIND_LONG;
             $self->semValue = new Expr\Array_($self->semStack[$stackPos-(4-3)], $attrs);
             $self->createdArrays->attach($self->semValue);
             },

lib/PhpParser/Parser/Php8.php

@@ -2568,11 +2568,17 @@ protected function initReduceCallbacks(): void {
                  $self->semValue = new Expr\ClassConstFetch($self->semStack[$stackPos-(3-1)], new Expr\Error($self->getAttributes($self->tokenStartStack[$stackPos-(3-3)],  $self->tokenEndStack[$stackPos-(3-3)])), $self->getAttributes($self->tokenStartStack[$stackPos-(3-1)], $self->tokenEndStack[$stackPos])); $self->errorState = 2;
             },
             549 => static function ($self, $stackPos) {
-                 $attrs = $self->getAttributes($self->tokenStartStack[$stackPos-(3-1)], $self->tokenEndStack[$stackPos]); $attrs['kind'] = Expr\Array_::KIND_SHORT;
+                 $attrs = $self->getAttributes($self->tokenStartStack[$stackPos-(3-1)], $self->tokenEndStack[$stackPos]);
+            $attrs['kind'] = $self->isMultiline($attrs)
+                ? Expr\Array_::KIND_SHORT | Expr\Array_::KIND_MULTILINE
+                : Expr\Array_::KIND_SHORT;
             $self->semValue = new Expr\Array_($self->semStack[$stackPos-(3-2)], $attrs);
             },
             550 => static function ($self, $stackPos) {
-                 $attrs = $self->getAttributes($self->tokenStartStack[$stackPos-(4-1)], $self->tokenEndStack[$stackPos]); $attrs['kind'] = Expr\Array_::KIND_LONG;
+                 $attrs = $self->getAttributes($self->tokenStartStack[$stackPos-(4-1)], $self->tokenEndStack[$stackPos]);
+            $attrs['kind'] = $self->isMultiline($attrs)
+                ? Expr\Array_::KIND_LONG | Expr\Array_::KIND_MULTILINE
+                : Expr\Array_::KIND_LONG;
             $self->semValue = new Expr\Array_($self->semStack[$stackPos-(4-3)], $attrs);
             $self->createdArrays->attach($self->semValue);
             },

lib/PhpParser/ParserAbstract.php

@@ -1229,6 +1229,17 @@ private function isSimpleExit(array $args): bool {
         return false;
     }
 
+    /**
+     * @param array{startLine?:int, endLine?: int} $attrs
+     */
+    protected function isMultiline(array $attrs): bool {
+        if (!isset($attrs['startLine']) || !isset($attrs['endLine'])) {
+            return false;
+        }
+
+        return $attrs['startLine'] !== $attrs['endLine'];
+    }
+
     /**
      * @param array<Node\Arg|Node\VariadicPlaceholder> $args
      * @param array<string, mixed> $attrs

lib/PhpParser/PrettyPrinter/Standard.php

@@ -592,12 +592,16 @@ protected function pExpr_Variable(Expr\Variable $node): string {
     }
 
     protected function pExpr_Array(Expr\Array_ $node): string {
-        $syntax = $node->getAttribute('kind',
+        $kind = $node->getAttribute('kind',
             $this->shortArraySyntax ? Expr\Array_::KIND_SHORT : Expr\Array_::KIND_LONG);
+
+        $forceMultiline = ($kind & Expr\Array_::KIND_MULTILINE) === Expr\Array_::KIND_MULTILINE;
+        $syntax = $kind & ~Expr\Array_::KIND_MULTILINE;
+
         if ($syntax === Expr\Array_::KIND_SHORT) {
-            return '[' . $this->pMaybeMultiline($node->items, true) . ']';
+            return '[' . $this->pMaybeMultiline($node->items, true, $forceMultiline) . ']';
         } else {
-            return 'array(' . $this->pMaybeMultiline($node->items, true) . ')';
+            return 'array(' . $this->pMaybeMultiline($node->items, true, $forceMultiline) . ')';
         }
     }
 
@@ -1171,12 +1175,12 @@ protected function hasNodeWithComments(array $nodes): bool {
     }
 
     /** @param Node[] $nodes */
-    protected function pMaybeMultiline(array $nodes, bool $trailingComma = false): string {
-        if (!$this->hasNodeWithComments($nodes)) {
-            return $this->pCommaSeparated($nodes);
-        } else {
+    protected function pMaybeMultiline(array $nodes, bool $trailingComma = false, bool $forceMultiline = false): string {
+        if ($forceMultiline || $this->hasNodeWithComments($nodes)) {
             return $this->pCommaSeparatedMultiline($nodes, $trailingComma) . $this->nl;
         }
+
+        return $this->pCommaSeparated($nodes);
     }
 
     /** @param Node\AttributeGroup[] $nodes */

test/code/prettyPrinter/stmt/arrays.test

@@ -0,0 +1,30 @@
+Arrays
+-----
+<?php
+
+$short = [1, 2, 3];
+$shortMultiline = [
+    1,
+    2,
+    3
+];
+
+$long = array(1, 2, 3);
+$longMultiline = array(
+    1,
+    2,
+    3
+);
+-----
+$short = [1, 2, 3];
+$shortMultiline = [
+    1,
+    2,
+    3,
+];
+$long = array(1, 2, 3);
+$longMultiline = array(
+    1,
+    2,
+    3,
+);