Are there any specific PHP functions or configurations that need to be checked for successful file uploads?

To ensure successful file uploads in PHP, you need to check the following configurations: 1. `upload_max_filesize` and `post_max_size` settings in php.ini should be large enough to accommodate the file size you want to upload. 2. `file_uploads` should be set to `On` in php.ini to allow file uploads. 3. Make sure the form that submits the file has `enctype="multipart/form-data"` attribute.

// Check PHP configurations for file uploads
if (ini_get('file_uploads') == false) {
    echo "File uploads are not enabled.";
}

if (ini_get('upload_max_filesize') < $file_size) {
    echo "Maximum file size limit exceeded.";
}

if (ini_get('post_max_size') < $file_size) {
    echo "Maximum POST size limit exceeded.";
}