From 8cbfba217fde16afa6671dcd022a5e8c36efa380 Mon Sep 17 00:00:00 2001
From: Matt Gray <rrazor@gmail.com>
Date: Tue, 20 Apr 2021 10:39:14 -0500
Subject: [PATCH 1/2] Address #4881 by implementing a more complete fake stream
 wrapper

---
 .../FileReadTrapStreamWrapper.php             | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/src/Reflection/BetterReflection/SourceLocator/FileReadTrapStreamWrapper.php b/src/Reflection/BetterReflection/SourceLocator/FileReadTrapStreamWrapper.php
index 7415582a96..2db6d376a6 100644
--- a/src/Reflection/BetterReflection/SourceLocator/FileReadTrapStreamWrapper.php
+++ b/src/Reflection/BetterReflection/SourceLocator/FileReadTrapStreamWrapper.php
@@ -31,6 +31,10 @@ final class FileReadTrapStreamWrapper
 
 	public static ?string $autoloadLocatedFile = null;
 
+	private bool $readFromFile = false;
+
+	private int $seekPosition = 0;
+
 	/**
 	 * @param string[] $streamWrapperProtocols
 	 *
@@ -85,6 +89,8 @@ public static function withStreamWrapperOverride(
 	public function stream_open($path, $mode, $options, &$openedPath): bool
 	{
 		self::$autoloadLocatedFile = $path;
+		$this->readFromFile = false;
+		$this->seekPosition = 0;
 
 		return true;
 	}
@@ -99,6 +105,8 @@ public function stream_open($path, $mode, $options, &$openedPath): bool
 	 */
 	public function stream_read($count): string
 	{
+		$this->readFromFile = true;
+
 		// Dummy return value that is also valid PHP for require(). We'll read
 		// and process the file elsewhere, so it's OK to provide dummy data for
 		// this read.
@@ -173,4 +181,64 @@ public function url_stat($path, $flags)
 		return $result;
 	}
 
+	/**
+	 * Simulates behavior of reading from an empty file.
+	 *
+	 * @return bool
+	 */
+	public function stream_eof(): bool
+	{
+		return $this->readFromFile;
+	}
+
+	public function stream_flush(): bool
+	{
+		return true;
+	}
+
+	public function stream_tell(): int
+	{
+		return $this->seekPosition;
+	}
+
+	/**
+	 * @param   int  $offset
+	 * @param   int  $whence
+	 * @return  bool
+	 */
+	public function stream_seek($offset, $whence): bool
+	{
+		switch ($whence) {
+			// Behavior is the same for a zero-length file
+			case SEEK_SET:
+			case SEEK_END:
+				if ($offset < 0) {
+					return false;
+				}
+				$this->seekPosition = $offset;
+				return true;
+
+			case SEEK_CUR:
+				if ($offset < 0) {
+					return false;
+				}
+				$this->seekPosition += $offset;
+				return true;
+
+			default:
+				return false;
+		}
+	}
+
+	/**
+	 * @param int  $option
+	 * @param int  $arg1
+	 * @param int  $arg2
+	 * @return bool
+	 */
+	public function stream_set_option($option, $arg1, $arg2): bool
+	{
+		return false;
+	}
+
 }

From 74d8ac91017958f10df2369a98d2a928714e00c1 Mon Sep 17 00:00:00 2001
From: Matt Gray <rrazor@gmail.com>
Date: Thu, 22 Apr 2021 10:32:10 -0500
Subject: [PATCH 2/2] Disable OpCache for PHP < 7.4.x, #4881

---
 bin/phpstan | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/bin/phpstan b/bin/phpstan
index 708dc95cdc..de25ec2c0a 100755
--- a/bin/phpstan
+++ b/bin/phpstan
@@ -11,6 +11,11 @@ use Symfony\Component\Console\Helper\ProgressBar;
 (function () {
 	error_reporting(E_ALL);
 	ini_set('display_errors', 'stderr');
+    if (version_compare(PHP_VERSION, '7.4.0', '<')) {
+		// PHP earlier than 7.4.x with OpCache triggers a bug when we intercept
+		// custom autoloaders' reads to discover file paths. See PHPStan #4881.
+		ini_set('opcache.enable', 'Off');
+	}
 	gc_disable(); // performance boost
 
 	define('__PHPSTAN_RUNNING__', true);