What are the potential configuration settings in PHP (such as upload_max_filesize and max_post_size) that could affect file uploads and form submissions?

When dealing with file uploads and form submissions in PHP, it's important to consider configuration settings that can impact these processes. Two crucial settings are `upload_max_filesize` and `post_max_size`. The `upload_max_filesize` directive specifies the maximum size of uploaded files, while `post_max_size` sets the maximum size of POST data that PHP will accept. Ensuring these values are set appropriately can prevent issues with file uploads and form submissions.

// Set maximum upload file size to 10MB
ini_set('upload_max_filesize', '10M');

// Set maximum post size to 20MB
ini_set('post_max_size', '20M');