Occasional deprecation notices under PHP 8.4

[Marian-Kechlibar]

Version: 3.3.1

PHP version: 8.4.1

Bug Description

Warning: unserialize(): Error at offset 0 of 26 bytes in /var/www/html/vendor/nette/caching/src/Caching/Storages/FileStorage.php on line 306

Deprecated: Automatic conversion of false to array is deprecated in /var/www/html/vendor/nette/caching/src/Caching/Storages/FileStorage.php on line 307

Warning: unserialize(): Error at offset 0 of 3 bytes in /var/www/html/vendor/nette/caching/src/Caching/Storages/FileStorage.php on line 306

Deprecated: Automatic conversion of false to array is deprecated in /var/www/html/vendor/nette/caching/src/Caching/Storages/FileStorage.php on line 307

Warning: unserialize(): Error at offset 0 of 26 bytes in /var/www/html/vendor/nette/caching/src/Caching/Storages/FileStorage.php on line 306

Deprecated: Automatic conversion of false to array is deprecated in /var/www/html/vendor/nette/caching/src/Caching/Storages/FileStorage.php on line 307

Notice: Possible problem: you are sending a HTTP header while already having some data in output buffer. Try Tracy\OutputDebugger or send cookies/start session earlier. in /var/www/html/vendor/nette/http/src/Http/Response.php on line 279

Steps To Reproduce

Happens occasionally on my production server, but the problem seems to be syntax-centered. The code around the problem is as follows:

		$size = (int) stream_get_contents($handle, self::MetaHeaderLen);
		if ($size) {
			$meta = stream_get_contents($handle, $size, self::MetaHeaderLen);
			$meta = unserialize($meta);
			$meta[self::File] = $file;
			$meta[self::Handle] = $handle;
			return $meta;
		}

unserialize may return false, in which case the $meta variable shouldn't be be treated as an array. PHP's unserialize is a bit of a cursed function, though. Not very reliable.

Expected Behavior

No warnings.

Possible Solution