PHP Simple way to replace or remove empty lines with str_replace

Question

$line-out = str_replace(\'\\r\', \'\', str_replace(\'\\n\', \'\', $line-in));

The above works for me but, I saw a [\\n\\r] example somewhere and I

Answer 1

This is from php.net's example #2 in str_replace (modified to suit the "environment"):