ErrorHandler PHP 8.1 compatibility

bin/composer

@@ -10,6 +10,7 @@ require __DIR__.'/../src/bootstrap.php';
 
 use Composer\Console\Application;
 use Composer\XdebugHandler\XdebugHandler;
+use Composer\Util\ErrorHandler;
 
 error_reporting(-1);
 
@@ -57,6 +58,8 @@ if (function_exists('ini_set')) {
 
 putenv('COMPOSER_BINARY='.realpath($_SERVER['argv'][0]));
 
+ErrorHandler::register();
+
 // run the command application
 $application = new Application();
 $application->run();

src/Composer/Console/Application.php

@@ -127,6 +127,8 @@ public function doRun(InputInterface $input, OutputInterface $output)
         $io = $this->io = new ConsoleIO($input, $output, new HelperSet(array(
             new QuestionHelper(),
         )));
+
+        // Register error handler again to pass it the IO instance
         ErrorHandler::register($io);
 
         if ($input->hasParameterOption('--no-cache')) {

src/Composer/Util/ErrorHandler.php

@@ -52,6 +52,15 @@ public static function handle($level, $message, $file, $line)
         }
 
         if (self::$io) {
+            // ignore symfony/* deprecation warnings about return types
+            // also ignore them from the Composer namespace, as 1.x won't get all that fixed anymore
+            if (preg_match('{^Return type of (Symfony|Composer)\\\\.*ReturnTypeWillChange}is', $message)) {
+                return true;
+            }
+            if (strpos(strtr($file, '\\', '/'), 'vendor/symfony/') !== false) {
+                return true;
+            }
+
             self::$io->writeError('<warning>Deprecation Notice: '.$message.' in '.$file.':'.$line.'</warning>');
             if (self::$io->isVerbose()) {
                 self::$io->writeError('<warning>Stack trace:</warning>');