What potential issues can arise when trying to upload large files using PHP?

When trying to upload large files using PHP, potential issues can arise due to server configuration limitations such as upload_max_filesize and post_max_size. To solve this issue, you can adjust these settings in your php.ini file or use PHP code to dynamically increase these limits during file upload.

// Increase upload size limits dynamically
ini_set('upload_max_filesize', '20M');
ini_set('post_max_size', '25M');