Description:
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From manual page: https://php.net/function.nl2br
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It is not true that: "nl2br — Inserts HTML line breaks before all newlines in a string".  It only does this if the string is double quoted.

Generally perhaps there is no need to point this out, but on the nl2br page it seems a central point.

User 'aabaev' posted the following 1 year ago, but as it's the fifth comment in, past four that are pretty advanced.  I found it only after the penny had finally dropped:

double quotes !== single quotes

php > echo nl2br('\r\n');
\r\n
php > echo nl2br("\r\n");
<br />

The manual (at string.php) says:

"If the string is enclosed in double-quotes ("), PHP will interpret the following escape sequences for special characters: ...
... Sequence: \n  Meaning: linefeed (LF or 0x0A (10) in ASCII)" 

but nl2br is needed to introduce a LF in this case ...