Refact "/autoload.php" literal to constant

src/Composer/Autoload/AutoloadGenerator.php

@@ -37,6 +37,9 @@ use Composer\Json\JsonFile;
  */
 class AutoloadGenerator
 {
+
+    private const AUTOLOAD_FILE = "/autoload.php";
+
     /**
      * @var EventDispatcher
      */
@@ -379,8 +382,8 @@ EOF;
             $suffix = $config->get('autoloader-suffix');
 
             // carry over existing autoload.php's suffix if possible and none is configured
-            if (null === $suffix && Filesystem::isReadable($vendorPath.'/autoload.php')) {
-                $content = file_get_contents($vendorPath.'/autoload.php');
+            if (null === $suffix && Filesystem::isReadable($vendorPath.self::AUTOLOAD_FILE)) {
+                $content = file_get_contents($vendorPath.self::AUTOLOAD_FILE);
                 if (Preg::isMatch('{ComposerAutoloaderInit([^:\s]+)::}', $content, $match)) {
                     $suffix = $match[1];
                 }
@@ -421,7 +424,7 @@ EOF;
         } elseif (file_exists($targetDir.'/platform_check.php')) {
             unlink($targetDir.'/platform_check.php');
         }
-        $filesystem->filePutContentsIfModified($vendorPath.'/autoload.php', $this->getAutoloadFile($vendorPathToTargetDirCode, $suffix));
+        $filesystem->filePutContentsIfModified($vendorPath.self::AUTOLOAD_FILE, $this->getAutoloadFile($vendorPathToTargetDirCode, $suffix));
         $filesystem->filePutContentsIfModified($targetDir.'/autoload_real.php', $this->getAutoloadRealFile(true, (bool) $includePathFileContents, $targetDirLoader, (bool) $includeFilesFileContents, $vendorPathCode, $appBaseDirCode, $suffix, $useGlobalIncludePath, $prependAutoloader, $checkPlatform));
 
         $filesystem->safeCopy(__DIR__.'/ClassLoader.php', $targetDir.'/ClassLoader.php');