How can the PHP configuration settings, such as post_max_size in php.ini, affect file uploads?

The PHP configuration settings, such as post_max_size in php.ini, can limit the maximum size of files that can be uploaded through a web form. If the file being uploaded exceeds this limit, the upload will fail. To solve this issue, you can increase the post_max_size value in the php.ini file to allow larger file uploads.

// Increase the maximum file size for uploads
ini_set('post_max_size', '20M');