minor #6326 Bump migration sets used to PHP7.4 (SpacePossum)

This PR was squashed before being merged into the master branch (closes #6326).

Discussion
----------

Bump migration sets used to PHP7.4

First commit updates project config.
Second is the result when running the tool, no additional changes are made.
3rd is to fix SCA checks on PHP8.1 (`highest`) migrations testing

Commits
-------

22d3cbf Bump migration sets used to PHP7.4

.php-cs-fixer.dist.php

@@ -13,14 +13,14 @@
  */
 
 $header = <<<'EOF'
-This file is part of PHP CS Fixer.
+    This file is part of PHP CS Fixer.
 
-(c) Fabien Potencier <fabien@symfony.com>
-    Dariusz Rumiński <dariusz.ruminski@gmail.com>
+    (c) Fabien Potencier <fabien@symfony.com>
+        Dariusz Rumiński <dariusz.ruminski@gmail.com>
 
-This source file is subject to the MIT license that is bundled
-with this source code in the file LICENSE.
-EOF;
+    This source file is subject to the MIT license that is bundled
+    with this source code in the file LICENSE.
+    EOF;
 
 $finder = PhpCsFixer\Finder::create()
     ->ignoreDotFiles(false)
@@ -37,14 +37,16 @@
 $config
     ->setRiskyAllowed(true)
     ->setRules([
-        '@PHP71Migration' => true,
-        '@PHP71Migration:risky' => true,
+        '@PHP74Migration' => true,
+        '@PHP74Migration:risky' => true,
         '@PHPUnit75Migration:risky' => true,
         '@PhpCsFixer' => true,
         '@PhpCsFixer:risky' => true,
         'general_phpdoc_annotation_remove' => ['annotations' => ['expectedDeprecation']], // one should use PHPUnit built-in method instead
         'header_comment' => ['header' => $header],
+        'heredoc_indentation' => false, // TODO switch on when # of PR's is lower
         'modernize_strpos' => true, // needs PHP 8+ or polyfill
+        'use_arrow_functions' => false, // TODO switch on when # of PR's is lower
     ])
     ->setFinder($finder)
 ;

src/AbstractFunctionReferenceFixer.php

@@ -58,7 +58,7 @@ protected function find(string $functionNameToSearch, Tokens $tokens, int $start
         }
 
         // make interface consistent with findSequence
-        $end = $end ?? $tokens->count();
+        $end ??= $tokens->count();
 
         // find raw sequence which we can analyse for context
         $candidateSequence = [[T_STRING, $functionNameToSearch], '('];

src/Fixer/Whitespace/HeredocIndentationFixer.php

@@ -164,7 +164,7 @@ private function fixIndentation(Tokens $tokens, int $start, int $end): void
 
         $content = $tokens[$index]->getContent();
 
-        if (!\in_array($content[0], ["\r", "\n"], true) && (!$currentIndent || $currentIndent === substr($content, 0, $currentIndentLength))) {
+        if (!\in_array($content[0], ["\r", "\n"], true) && (!$currentIndent || str_starts_with($content, $currentIndent))) {
             $content = $indent.substr($content, $currentIndentLength);
         } elseif ($currentIndent) {
             $content = Preg::replace('/^(?!'.$currentIndent.')\h+/', '', $content);

tests/Fixer/StringNotation/SingleQuoteFixerTest.php

@@ -78,10 +78,12 @@ public function provideTestFixCases(): array
                 '<?php $a = \'foo "bar"\';',
                 '<?php $a = "foo \"bar\"";',
             ],
-            [<<<'EOF'
+            [
+                <<<'EOF'
 <?php $a = '\\foo\\bar\\\\';
 EOF
-                , <<<'EOF'
+                ,
+                <<<'EOF'
 <?php $a = "\\foo\\bar\\\\";
 EOF
             ],

tests/Test/AbstractFixerTestCase.php

@@ -379,7 +379,7 @@ protected function doTest(string $expected, ?string $input = null, ?\SplFileInfo
             throw new \InvalidArgumentException('Input parameter must not be equal to expected parameter.');
         }
 
-        $file = $file ?? $this->getTestFile();
+        $file ??= $this->getTestFile();
         $fileIsSupported = $this->fixer->supports($file);
 
         if (null !== $input) {