fix: formatter breaks php-view file contains phpdoc block and php short-tags (#1567)

* add tests reproducing the issue

* fix: type of openTag for the first node shouldn't depend on kind of the next node

* add test where file starts with shorttag

Author: zarv1k

src/printer.js

@@ -1029,7 +1029,7 @@ function printLines(path, options, print, childrenAttribute = "children") {
         childNode.leadingComments && childNode.leadingComments.length
           ? concat([
               isFirstNode && node.kind !== "namespace" && !isBlockNestedNode
-                ? openTag
+                ? "<?php"
                 : "",
               node.kind === "namespace" || !isBlockNestedNode ? hardline : "",
               comments.printComments(childNode.leadingComments, options),

tests/inline/__snapshots__/jsfmt.spec.js.snap

@@ -2347,6 +2347,74 @@ try {
 ================================================================================
 `;
 
+exports[`mixed-54.php 1`] = `
+====================================options=====================================
+parsers: ["php"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+<?php
+/**
+ * @var string $a
+ */
+?>
+<?= $a ?>
+<?php echo $a; ?>
+
+=====================================output=====================================
+<?php
+/**
+ * @var string $a
+ */
+?>
+<?= $a ?>
+<?php echo $a; ?>
+
+================================================================================
+`;
+
+exports[`mixed-55.php 1`] = `
+====================================options=====================================
+parsers: ["php"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+<?php
+/**
+ * @var string $a
+ */
+?>
+<?php echo $a; ?>
+<?= $a ?>
+
+=====================================output=====================================
+<?php
+/**
+ * @var string $a
+ */
+?>
+<?php echo $a; ?>
+<?= $a ?>
+
+================================================================================
+`;
+
+exports[`mixed-56.php 1`] = `
+====================================options=====================================
+parsers: ["php"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+<?= $a ?>
+<?php echo $a; ?>
+
+=====================================output=====================================
+<?= $a ?>
+<?php echo $a; ?>
+
+================================================================================
+`;
+
 exports[`namespace-1.php 1`] = `
 ====================================options=====================================
 parsers: ["php"]

tests/inline/mixed-54.php

@@ -0,0 +1,7 @@
+<?php
+/**
+ * @var string $a
+ */
+?>
+<?= $a ?>
+<?php echo $a; ?>

tests/inline/mixed-55.php

@@ -0,0 +1,7 @@
+<?php
+/**
+ * @var string $a
+ */
+?>
+<?php echo $a; ?>
+<?= $a ?>

tests/inline/mixed-56.php

@@ -0,0 +1,2 @@
+<?= $a ?>
+<?php echo $a; ?>