`tests/benchmark/benchmark.php` failed when specifying a non-exist output csv file

[WangYihang]

Version(s) affected

2.6

Description

The benchmark script (tests/benchmark/benchmark.php) failed to run when user specified a non-exist output csv file via php tests/benchmark/benchmark.php --csv non-exist.csv.

How to reproduce

Dockerfile for reproduce

FROM php:8.4-alpine

# Install dependencies
RUN apk add --no-cache git

# Install composer
COPY --from=composer:latest /usr/bin/composer /usr/local/bin/composer

# Clone project
WORKDIR /app
RUN git \
    clone \
    https://github.com/thephpleague/commonmark \
    --branch=2.6.1 \
    --depth=1 \
    /app
RUN composer install

# Run the benchmark
ENTRYPOINT [ "sh", "-c", "php tests/benchmark/benchmark.php --csv benchmark.csv" ]

Current output

$ docker build . -t commonmark && docker run --rm -it commonmark
docker build . -t commonmark && docker run --rm -it commonmark 
[+] Building 1.2s (12/12) FINISHED                                                                                               docker:default
 => [internal] load build definition from Dockerfile                                                                                       0.0s
 => => transferring dockerfile: 471B                                                                                                       0.0s
 => => writing image sha256:931f9a3465f1a4d16eb0913c1ae8904054537d47d4ebaf681adad5c6427d5861                                               0.0s
 => => naming to docker.io/library/commonmark                                                                                              0.0s

Fatal error: Uncaught ValueError: Path must not be empty in /app/tests/benchmark/benchmark.php:123
Stack trace:
#0 /app/tests/benchmark/benchmark.php(123): fopen('', 'w+')
#1 {main}
  thrown in /app/tests/benchmark/benchmark.php on line 123

Expected output

$ docker build . -t commonmark && docker run --rm -it commonmark
Benchmark Results, CPU:
        1) cebe/markdown                1.51 ms              
        2) Parsedown                    1.64 ms      -0.13 ms
        3) cebe/markdown extra          1.80 ms      -0.29 ms
        4) cebe/markdown gfm            1.89 ms      -0.38 ms
        5) PHP Markdown                 2.05 ms      -0.54 ms
        6) PHP Markdown Extra           2.95 ms      -1.44 ms
        7) CommonMark                   5.74 ms      -4.23 ms
        8) CommonMark GFM               5.96 ms      -4.45 ms
        9) CommonMark All Extensions    8.29 ms      -6.78 ms

Possible solution

commonmark/tests/benchmark/benchmark.php

Lines 118 to 127 in 64cba7f

	if ($config['csv'] !== false) {
	$stream = ctype_digit($config['csv']) ?
	"php://fd/{$config['csv']}" :
	realpath($config['csv']);
	$fd = @fopen(
	$stream,
	$config['exec'] === 'exec' ?
	'w' : 'w+'
	);

Change realpath($config['csv']); to $config['csv'];.

Additional context

No response

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