$file_content = file_get_contents('/path/to/file');
$file_content = file_get_contents('http://example.com/file.txt');
if (file_exists('/path/to/file')) { $file_content = file_get_contents('/path/to/file'); } else { echo 'File does not exist.'; }For determining the package library, we need to look at the `file_get_contents()` function. It is a built-in function in PHP and does not require any external package or library.