\n vs. PHP_EOL vs. ?

Question

In most cases, as for one interactive website, when we output multiple lines of contents to web client browser, in my opinion,
is much more prefer

Answer 1

I have to run scripts on cron and save results to a log file. But sometimes I run the script on my browser. So I do the following test in order to use the correct end of line char:

";
echo "DISCOVER". $eol;
?>