How can the post_max_size and upload_max_filesize settings in php.ini impact file uploads in PHP applications?

The post_max_size and upload_max_filesize settings in php.ini dictate the maximum size of files that can be uploaded through PHP applications. If these settings are too low, users may encounter errors when trying to upload large files. To fix this issue, you can increase the values of post_max_size and upload_max_filesize in the php.ini file to allow for larger file uploads.

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