What are the limitations of uploading files from an iPhone or smartphone using PHP?

When uploading files from an iPhone or smartphone using PHP, one limitation is that the file size may exceed the server's upload limit. To solve this, you can increase the upload_max_filesize and post_max_size directives in the php.ini file on the server.

// Increase upload_max_filesize and post_max_size in php.ini
ini_set('upload_max_filesize', '20M');
ini_set('post_max_size', '25M');