What could be the potential reasons for ImageFilledRectangle not working on a Linux server compared to a Windows environment?

The potential reasons for ImageFilledRectangle not working on a Linux server compared to a Windows environment could be due to differences in the GD library versions, missing dependencies, or incorrect permissions on the server. To solve this issue, you can try updating the GD library, installing any missing dependencies, or adjusting the permissions on the server.

// Example code snippet to set correct permissions for GD library on a Linux server
chmod("/path/to/your/image.jpg", 0755);