Fixing PHPStan Memory Limit Issues in Docker

Описание: Discover how to resolve the `memory limit` error when running `PHPStan` in a Docker environment. Learn practical solutions and tips for optimizing PHP memory limits.
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This video is based on the question https://stackoverflow.com/q/77227717/ asked by the user 'mstdmstd' ( https://stackoverflow.com/u/10873713/ ) and on the answer https://stackoverflow.com/a/77230082/ provided by the user 'Ondřej Mirtes' ( https://stackoverflow.com/u/565782/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Dealing with PHPStan Memory Limit Errors in Docker

If you're a developer working with Laravel and Docker, you may run into a frustrating scenario where PHPStan, a tool for static analysis in PHP, throws memory limit errors. This can happen when you're trying to analyze your codebase in a Docker container and find yourself hitting a brick wall due to insufficient memory allocation. Let's explore why this happens and how to effectively resolve the issue.

Understanding the Problem

The Challenge

You might be running a command such as:

[[See Video to Reveal this Text or Code Snippet]]

Only to be greeted with errors stating that the memory limit cannot be set because:

The value is too low compared to the current memory usage.

Invalid formats such as "0.5M" are not accepted.

Example Error Output:

[[See Video to Reveal this Text or Code Snippet]]

Why This Happens

PHP CLI vs. Webserver Configuration:
The memory limit setting in your virtualhost.conf only applies to your web server. When you run PHPStan from the command line (CLI), it does not read from that conf file.

Default Memory Settings:
PHP has default memory settings (typically 128M or more), which your current configurations are being compared against. Trying to set a limit below this can lead to errors.

The Solution

Configuring PHPStan with Appropriate Memory Limits

To resolve the memory limit error when running PHPStan in Docker, follow these steps:

Use appropriate memory limits:
Instead of trying to limit the memory to 1M or something similarly low, try setting it to a higher value - ideally matching what you have for the web server.

For example, if your webserver configuration allows for 4048M, run:

[[See Video to Reveal this Text or Code Snippet]]

Checking Available Memory
Before running the command, it may be prudent to check your available memory:

[[See Video to Reveal this Text or Code Snippet]]

This command will give you an overview of your total, used, and available memory within your Docker container, ensuring that your settings won't exceed the actual limits.

Adjust your Docker settings (if necessary):
If you consistently run into memory issues, consider revising your Docker container settings or the specifications of your development setup. For instance, increasing the memory allocated to the container may help alleviate these problems.

Example Command

Here’s what your command line might look like:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Memory limit errors in Docker when running PHPStan are often due to misunderstanding PHP's CLI configurations versus web server settings. By correctly setting and aligning your memory limits, you can run PHPStan smoothly without these interruptions. Simply ensure you're requesting a reasonable amount of memory—preferably in line with your server's settings—and you should be well on your way to better code analysis.

For any further assistance or if you continue encountering issues, consider visiting PHPStan's documentation or forums for community support.