file_get_contents() can help us here. It reads a file and stores it in a string. Can be used with local files, as well as online content:
$myLocalFile = file_get_contents('myfile.html');
$myOnlineFile = file_get_contents('http://wpguru.co.uk');
echo myOnline File; // would display the actual website
This is different from the file() function which reads the contents of a file into an array.