Performance regression on array structures in 1.8.3

[leongersen]

I'm running into a performance regression between 1.8.1 and 1.8.3.

This file contains a lot of array structures, and is already fairly slow on 1.8.1. On 1.8.3, the time to analyse explodes.

bin/phpstan analyse <file>.php --debug -vvv

On 1.8.1:

--- consumed 70.5 MB, total 118.5 MB, took 33.14 s

On 1.8.3:

--- consumed 72.5 MB, total 122.5 MB, took 264.10 s

The file in question is full of business logic and references other classes, so I took the time to strip it down to something without dependencies.

Analysis of this stripped file in 1.8.3 shows a 10x slowdown compared to 1.8.1:

On 1.8.1:

--- consumed 18 MB, total 46 MB, took 6.40 s

On 1.8.3:

--- consumed 28 MB, total 78 MB, took 68.58 s

Stripped down file:
file.php.txt

[mergeable]

Hi there! 👋

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I need some help with my code because PHPStan doesn't like it.

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The current issue will be closed. This is a precaution to save maintainer's time, I hope you'll understand.

Sincerely, the bot 🤖

[github-actions]

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