Description:
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copied from the documentation nl2br can replace the following:

\r\n, \n\r, \n und \r

it might be an improvement if it can also replace the html5 entity &newline;

e.g. when htmlentities is used with ENT_HTML5 and nl2br afterwards all newlines are no longer replaced due to the ENT_HTML5 flag, but with all other flags this works. with htmlspecialchars this even works with the ENT_HTML5 flag as its not replacing that much entities.

an alternative would be to provide an option to skip or change the &Newline; entity more easily. this ticket is just opened to suggest a way to ease the use of nl2br regarding html5.

Test script:
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$test = "abc\n"defg";

$escape = htmlentities($test, ENT_HTML5);

$result = nl2br($escape);

Expected result:
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var_dump($result); // string "abc&Newline;<br />defg"

Actual result:
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var_dump($result); // string "abc&Newline;defg"