What functions of the filesystem in PHP could be utilized for saving webpage content as a text file?

To save webpage content as a text file in PHP, you can utilize the `file_put_contents()` function. This function allows you to write data to a file, creating the file if it does not already exist. You can use this function to save the webpage content as a text file by passing the content you want to save and the file path as arguments.

// Save webpage content as a text file
$content = file_get_contents('https://www.example.com');
file_put_contents('saved_content.txt', $content);