PHP Normalize Newlines/Line Endings; CRLF; CR; LF; UNIX, Windows, Mac

Content

define('CR', "\r");          // Carriage Return: Mac
define('LF', "\n");          // Line Feed: Unix
define('CRLF', "\r\n");      // Carriage Return and Line Feed: Windows
define('BR', '<br />' . LF); // HTML Break

function normalize($s) {
    // Normalize line endings using Global
    // Convert all line-endings to UNIX format
    $s = str_replace(CRLF, LF, $s);
    $s = str_replace(CR, LF, $s);
    // Don't allow out-of-control blank lines
    $s = preg_replace("/\n{2,}/", LF . LF, $s);
    return $s;
}

function normalize($s) {
    // Normalize line endings
    // Convert all line-endings to UNIX format
    $s = str_replace("\r\n", "\n", $s);
    $s = str_replace("\r", "\n", $s);
    // Don't allow out-of-control blank lines
    $s = preg_replace("/\n{2,}/", "\n\n", $s);
    return $s;
}

Comments (RSS)

anonymous – Oct 7, 2010
CR: Mac
LF: Unix
CRLF: Windows
Reply
anonymous – Nov 3, 2011
LF:    Line Feed, U+000A
VT:    Vertical Tab, U+000B
FF:    Form Feed, U+000C
CR:    Carriage Return, U+000D
CR+LF: CR (U+000D) followed by LF (U+000A)
NEL: Next Line, U+0085
LS:    Line Separator, U+2028
PS:    Paragraph Separator, U+2029
Reply
anonymous – Nov 16, 2012
Thank you
Reply
anonymous – Sep 1, 2013
I had a problem reading text from a mysqul database in order to create a shell script... But the scrip came out with line break in different format and could not be executed properly. So I use your script to convert text from database... AND IT WORKS fine. Thanks a lot
Reply
anonymous – Oct 24, 2013
Nice one .)
Reply
anonymous – Jul 24, 2014
Use "/\n{3,}/" instead of "/\n{2,}/" for the regex. It is pointless to replace "\n\n" with "\n\n".
Reply
anonymous – Jul 23, 2019
$s = str_replace("\r\n", "\n", $s);
$s = str_replace("\r", "\n", $s);
???
$s = str_replace(["\r\n", "\n"], "\n", $s);
Reply