InvalidArgumentException: Attribute name must be a string in file /var/task/vendor/nyholm/psr7/src/ServerRequest.php

[DanRVP]

When parsing path parameters like /{param} an exception is thrown. Stack trace:

InvalidArgumentException: Attribute name must be a string in file /var/task/vendor/nyholm/psr7/src/ServerRequest.php on line 174
Stack trace:
  1. InvalidArgumentException->() /var/task/vendor/nyholm/psr7/src/ServerRequest.php:174
  2. Nyholm\Psr7\ServerRequest->withAttribute() /var/task/vendor/bref/dev-server/src/Router.php:119
  3. Bref\DevServer\Router->addPathParameters() /var/task/vendor/bref/dev-server/src/Router.php:76
  4. Bref\DevServer\Router->match() /var/task/vendor/bref/dev-server/src/Handler.php:45
  5. Bref\DevServer\Handler->handleRequest() /var/task/vendor/bref/dev-server/src/server-handler.php:11

This is caused by preg_match returning numeric keys in Router::addPathParameters() line 119:

Input from preg_match() looks like:

array(2) {
  [0]=>
  string(11) "param_value"
  ["param"]=>
  string(11) "param_value"
}

I ran this setup in Docker with the image bref/php-83-dev:3.

[DanRVP]

Running on PHP 8.5 unit tests are failing due to this issue:

vendor/bin/phpunit tests
PHPUnit 9.6.35 by Sebastian Bergmann and contributors.

Warning:       Your XML configuration validates against a deprecated schema.
Suggestion:    Migrate your XML configuration using "--migrate-configuration"!

..E.                                                                4 / 4 (100%)

Time: 00:00.014, Memory: 6.00 MB

There was 1 error:

1) Bref\DevServer\Test\RouterTest::test routing path parameters
InvalidArgumentException: Attribute name must be a string

/home/dan/projects/bref-dev-server/vendor/nyholm/psr7/src/ServerRequest.php:174
/home/dan/projects/bref-dev-server/src/Router.php:119
/home/dan/projects/bref-dev-server/src/Router.php:76
/home/dan/projects/bref-dev-server/tests/RouterTest.php:47