PHP Australia Conference 2015

nl2br

(PHP 4, PHP 5)

nl2brInserta saltos de línea HTML antes de todas las nuevas líneas de un string

Descripción

string nl2br ( string $string [, bool $is_xhtml = true ] )

Devuelve el parámetro string con un '<br />' o '<br>' insertado antes de cada nueva línea. (\r\n, \n\r, \n y \r).

Parámetros

string

El string de entrada.

is_xhtml

Si utilizar saltos de línea compatibles con XHTML o no.

Valores devueltos

Devuelve el string alterado.

Ejemplos

Ejemplo #1 Usar nl2br()

<?php
echo nl2br("foo no es\n bar");
?>

El resultado del ejemplo sería:

foo no es<br />
 bar

Ejemplo #2 Generar marcado HTML válido utilizando el parámetro is_xhtml

<?php
echo nl2br("Bienvenido\r\nEste es mi documento HTML"false);
?>

El resultado del ejemplo sería:

Bienvenido<br>
Este es mi documento HTML

Ejemplo #3 Varios separadores de nueva línea

<?php
$cadena 
"Esto\r\nes\n\runa\ncadena\r";
echo 
nl2br($cadena);
?>

El resultado del ejemplo sería:

Esto<br />
es<br />
una<br />
cadena<br />

Historial de cambios

Versión Descripción
5.3.0 Se agregó el parámetro opcional is_xhtml.
4.0.5 nl2br() es ahora compatible con XHTML. Todas las versiones enteriores devolverán un string con un '<br>' insertado antes de las nuevas líneas, en lugar de '<br />'.

Ver también

  • htmlspecialchars() - Convierte caracteres especiales en entidades HTML
  • htmlentities() - Convierte todos los caracteres aplicables a entidades HTML
  • wordwrap() - Ajusta un string hasta un número dado de caracteres
  • str_replace() - Reemplaza todas las apariciones del string buscado con el string de reemplazo

add a note add a note

User Contributed Notes 10 notes

up
23
N/A
5 years ago
Here's a more simple one:

<?php
/**
* Convert BR tags to nl
*
* @param string The string to convert
* @return string The converted string
*/
function br2nl($string)
{
    return
preg_replace('/\<br(\s*)?\/?\>/i', "\n", $string);
}
?>

Enjoy
up
16
CGameProgrammer at gmail dot com
9 years ago
It's important to remember that this function does NOT replace newlines with <br> tags. Rather, it inserts a <br> tag before each newline, but it still preserves the newlines themselves! This caused problems for me regarding a function I was writing -- I forgot the newlines were still being preserved.

If you don't want newlines, do:

<?php
$Result
= str_replace( "\n", '<br />', $Text );
?>
up
5
fquffio at live dot it
3 months ago
Starting from PHP 4.3.10 and PHP 5.0.2, this should be the most correct way to replace <br /> and <br> tags with newlines and carriage returns.
<?php
/**
* Convert BR tags to newlines and carriage returns.
*
* @param string The string to convert
* @return string The converted string
*/
function br2nl ( $string )
{
    return
preg_replace('/\<br(\s*)?\/?\>/i', PHP_EOL, $string);
}
?>
(Please note this is a minor edit of this function: http://php.net/nl2br#86678 )

You might also want to be "platform specific", and therefore this function might be of some help:
<?php
/**
* Convert BR tags to newlines and carriage returns.
*
* @param string The string to convert
* @param string The string to use as line separator
* @return string The converted string
*/
function br2nl ( $string, $separator = PHP_EOL )
{
   
$separator = in_array($separator, array("\n", "\r", "\r\n", "\n\r", chr(30), chr(155), PHP_EOL)) ? $separator : PHP_EOL// Checks if provided $separator is valid.
   
return preg_replace('/\<br(\s*)?\/?\>/i', $separator, $string);
}
?>
up
6
Anders Norrbring
8 years ago
Seeing all these suggestions on a br2nl function, I can also see that neither would work with a sloppy written html line break.. Users can't be trusted to write good code, we know that, and mixing case isn't too uncommon.

I think this little snippet would do most tricks, both XHTML style and HTML, even mixed case like <Br> <bR /> and even <br            > or <br     />.

<?php
function br2nl($text)
{
    return 
preg_replace('/<br\\s*?\/??>/i', '', $text);
}
?>
up
6
ngkongs at gmail dot com
7 years ago
to replace all linebreaks to <br />
the best solution (IMO) is:

<?php
function nl2br2($string) {
$string = str_replace(array("\r\n", "\r", "\n"), "<br />", $string);
return
$string;
}
?>

because each OS have different ASCII chars for linebreak:
windows = \r\n
unix = \n
mac = \r

works perfect for me
up
1
blacknine313 at gmail dot com
6 years ago
After a recent post at the forums on Dev Shed, I noticed that it isn't mentioned, so I will mention it.

nl2br returns pure HTML, so it should be after PHP anti-HTML functions ( such as strip_tags and htmlspecialchars ).
up
-1
darenschwenke at yahoo dot com
8 months ago
This one works with br tags having attributes, in any case,
closed or  not closed, and does not double linefeeds

<?php
/**
* convert br tags to nl
*
* @param string The string to convert
* @return string The converted string
*/

function br2nl($string)
{
    return
preg_replace("/<br[^>]*>\s*\r*\n*/is", "\n", $string);
}
?>

I combine this with strip_tags() for dead simple "contenteditable" fields allowing only text and linefeeds.
up
-2
j dot mons54 at gmail dot com
2 years ago
for bbcode :

<?php
$message
nl2br(preg_replace('#(\\]{1})(\\s?)\\n#Usi', ']', stripslashes($message)));
?>
up
-8
hyponiq at gmail dot com
7 years ago
On the contrary, <b>mark at dreamjunky.comno-spam</b>, this function is rightfully named.  Allow me to explain.  Although it does re-add the line break, it does so in an attempt to stay standards-compliant with the W3C recommendations for code format.

According to said recommendations, a new line character must follow a line break tag.  In this situation, the new line is not removed, but a break tag is added for proper browser display where a paragraph isn't necessary or wanted.
up
-60
billhicks at yahoo dot com
6 months ago
Your new site does not work in ie.

But you already know this and I guess you don't really care.

its all about style now - funny because this is a php site not a css/java/ajax site.

piss off!!!!!!!!!!!!!!!
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