fix: Correct the Composer autoload (#864)

In [0.18.0-rc.0](https://github.com/humbug/php-scoper/releases/tag/0.18.0-rc.0), more specifically in #298, the composer autoload global variable is completely reset. This is actually a problem for when there is excluded files, as they now count as not loaded and if included again in another project, will be loaded, which can cause problems.

.makefile/e2e.file

@@ -314,7 +314,10 @@ e2e_034: $(PHP_SCOPER_PHAR_BIN) fixtures/set034-installed-versions/vendor
 
 .PHONY: e2e_035
 e2e_035: # Runs end-to-end tests for the fixture set 035 — Tests tha composer autoloaded files are working fine
-e2e_035: $(PHP_SCOPER_PHAR_BIN) fixtures/set035-composer-files-autoload/vendor fixtures/set035-composer-files-autoload/guzzle5-include/vendor
+e2e_035: $(PHP_SCOPER_PHAR_BIN) \
+		fixtures/set035-composer-files-autoload/vendor \
+		fixtures/set035-composer-files-autoload/guzzle5-include/vendor \
+		fixtures/set035-composer-files-autoload/composer-variable-access/vendor
 	rm -rf build/set035-composer-files-autoload || true
 	cp -R fixtures/set035-composer-files-autoload build/set035-composer-files-autoload
 
@@ -328,6 +331,16 @@ e2e_035: $(PHP_SCOPER_PHAR_BIN) fixtures/set035-composer-files-autoload/vendor f
 	composer --working-dir=build/set035-composer-files-autoload/scoped-guzzle5-include dump-autoload
 	rm -rf build/set035-composer-files-autoload/guzzle5-include || true
 
+	$(PHP_SCOPER_PHAR) add-prefix \
+		--working-dir=fixtures/set035-composer-files-autoload/composer-variable-access \
+		--output-dir=../../../build/set035-composer-files-autoload/scoped-composer-variable-access \
+		--force \
+		--config=scoper.inc.php \
+		--no-interaction \
+		--stop-on-failure
+	composer --working-dir=build/set035-composer-files-autoload/scoped-composer-variable-access dump-autoload
+	rm -rf build/set035-composer-files-autoload/composer-variable-access || true
+
 	php build/set035-composer-files-autoload/index.php 2>&1 > build/set035-composer-files-autoload/output
 	php build/set035-composer-files-autoload/test.php
 
@@ -530,6 +543,13 @@ fixtures/set035-composer-files-autoload/guzzle5-include/composer.lock: fixtures/
 	@echo "$(@) is not up to date. You may want to run the following command:"
 	@echo "$$ composer --working-dir=fixtures/set035-composer-files-autoload/guzzle5-include update --lock && touch -c $(@)"
 
+fixtures/set035-composer-files-autoload/composer-variable-access/vendor: fixtures/set035-composer-files-autoload/composer-variable-access/composer.lock
+	composer --working-dir=fixtures/set035-composer-files-autoload/composer-variable-access install --no-dev --no-scripts
+	touch -c $@
+fixtures/set035-composer-files-autoload/composer-variable-access/composer.lock: fixtures/set035-composer-files-autoload/composer-variable-access/composer.json
+	@echo "$(@) is not up to date. You may want to run the following command:"
+	@echo "$$ composer --working-dir=fixtures/set035-composer-files-autoload/composer-variable-access update --lock && touch -c $(@)"
+
 build/set038/phpunit:
 	rm -rf $(E2E_PHPUNIT_DIR) || true
 	git clone --depth=1 --single-branch git@github.com:sebastianbergmann/phpunit.git $@

fixtures/set035-composer-files-autoload/check-non-prefixed-files.php

@@ -0,0 +1,39 @@
+<?php declare(strict_types=1);
+
+if (!isset($GLOBALS['__composer_autoload_files'])) {
+    // This is to mimic a scoped app that may access to the Composer related globals like
+    // PHPStan does.
+    echo 'Expected to be able to access the composer autoload files!'.PHP_EOL;
+    exit(1);
+}
+
+$composerAutoloadFiles = $GLOBALS['__composer_autoload_files'];
+
+$expectedPresentComposerAutoloadFiles = [
+    'a4a119a56e50fbb293281d9a48007e0e' => true, // vendor/symfony/polyfill-php80/bootstrap.php
+    '60884d26763a20c18bdf80c8935efaac' => true, // included-file.php
+];
+$expectedMissingComposerAutoloadFiles = [
+    '430aabe1de335715bfb79e58e8c22198' => true, // excluded-file.php
+];
+
+$actualExpectedPresent = array_diff_key(
+    $expectedPresentComposerAutoloadFiles,
+    $composerAutoloadFiles,
+);
+$actualExpectedMissing = array_diff_key(
+    $expectedMissingComposerAutoloadFiles,
+    $composerAutoloadFiles,
+);
+
+if (count($actualExpectedPresent) !== 0) {
+    echo 'Expected the following hashes to be present:'.PHP_EOL;
+    echo var_export($actualExpectedPresent, true).PHP_EOL;
+    exit(1);
+}
+
+if (count($actualExpectedMissing) !== count($expectedMissingComposerAutoloadFiles)) {
+    echo 'Expected the following hashes to be missing:'.PHP_EOL;
+    echo var_export($actualExpectedMissing, true).PHP_EOL;
+    exit(1);
+}

fixtures/set035-composer-files-autoload/composer-variable-access/composer.json

@@ -0,0 +1,12 @@
+{
+    "bin": "index.php",
+    "autoload": {
+        "files": [
+            "included-file.php",
+            "excluded-file.php"
+        ]
+    },
+    "require": {
+        "symfony/polyfill-php80": "^1.28"
+    }
+}

fixtures/set035-composer-files-autoload/composer-variable-access/excluded-file.php

@@ -0,0 +1,5 @@
+<?php
+
+if (!function_exists('test_global_function')) {
+    function test_global_function() {}
+}

fixtures/set035-composer-files-autoload/composer-variable-access/included-file.php

@@ -0,0 +1,5 @@
+<?php
+
+if (!function_exists('test_global_function')) {
+    function test_global_function() {}
+}

fixtures/set035-composer-files-autoload/composer-variable-access/index.php

@@ -0,0 +1,5 @@
+<?php declare(strict_types=1);
+
+require_once file_exists(__DIR__.'/vendor/scoper-autoload.php')
+    ? __DIR__.'/vendor/scoper-autoload.php'
+    : __DIR__.'/vendor/autoload.php';

fixtures/set035-composer-files-autoload/composer-variable-access/scoper.inc.php

@@ -0,0 +1,8 @@
+<?php
+
+return [
+    'exclude-files' => [
+        'included-file.php',
+        'vendor/symfony/polyfill-php80/bootstrap.php',
+    ],
+];

fixtures/set035-composer-files-autoload/composer-variable-access/vendor/autoload.php

@@ -0,0 +1,25 @@
+<?php
+
+// autoload.php @generated by Composer
+
+if (PHP_VERSION_ID < 50600) {
+    if (!headers_sent()) {
+        header('HTTP/1.1 500 Internal Server Error');
+    }
+    $err = 'Composer 2.3.0 dropped support for autoloading on PHP <5.6 and you are running '.PHP_VERSION.', please upgrade PHP or use Composer 2.2 LTS via "composer self-update --2.2". Aborting.'.PHP_EOL;
+    if (!ini_get('display_errors')) {
+        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {
+            fwrite(STDERR, $err);
+        } elseif (!headers_sent()) {
+            echo $err;
+        }
+    }
+    trigger_error(
+        $err,
+        E_USER_ERROR
+    );
+}
+
+require_once __DIR__ . '/composer/autoload_real.php';
+
+return ComposerAutoloaderInit945f0706470c9d6642a4450ed45b7c04::getLoader();