note 97692 modified in function.nl2br by danbrown
| From: | danbrown@php.net | Date: | Mon, 03 May 2010 16:03:32 +0000 |
| Subject: | note 97692 modified in function.nl2br by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-168887@lists.php.net to get a copy of this message | ||
*Strictly* reverts PHP's nl2br() effects (whether it was used in XHTML mode or not):
<?php
function nl2br_revert($string) {
return preg_replace('
<br(?: /)?>([\\n\\r])', '$1',
$string);
}
?>
Indeed, in a string which was just nl2br'd:
- a BR added by PHP is directly followed by a \n or a \r character, and vice versa
- a PHP-added BR is either "<br />" or "<br>" (no need to match
"<br/>", "<br />", "<BR>"...)
Thus this function only removes PHP-added BRs (which "strictly reverts" meant).
The following would be even more logical, as nl2br() doesn't use both BR forms at once:
<?php
function nl2br_revert_bis($string) {
$br = preg_match('<br>[\\n\\r]',$string) ? '<br>' :
'<br />';
return preg_replace(''.$br.'([\\n\\r])', '$1',
$string);
}
?>
If you don't want to use regular expressions, here are "plain" alternatives:
<?php
function nl2br_revert_noregex($string) {
// watch for order in arrays
// (the first 2 elements are for the case nl2br() was used in old HTML mode)
return str_replace(
array("<br>\n", "<br>\r", "<br />\n",
"<br />\r"),
array("<br />\n", "<br />\r", "\n",
"\r"),
$string
);
}
function nl2br_revert_bis_noregex($string) {
$br = (strpos($string,"<br>\n")!==false ||
strpos($string,"<br>\r")!==false) ? '<br>' : '<br
/>';
return str_replace(
array($br."\n", $br."\r"),
array( "\n", "\r"),
$string
);
}
?>
--was--
SORRY there was an error in my previous note (in nl2br_revert_noregex, "$string =" should
be "return"). I fixed it and reformated the code a little bit, for more readability. I
would be thankful someone could replace my previous post by this one (without this
"header" of course) :s
---
*Strictly* reverts PHP's nl2br() effects (whether it was used in XHTML mode or not):
<?php
function nl2br_revert($string) {
return preg_replace('<br(?: /)?>([\\n\\r])', '$1',
$string);
}
?>
Indeed, in a string which was just nl2br'd:
- a BR added by PHP is directly followed by a \n or a \r character, and vice versa
- a PHP-added BR is either "<br />" or "<br>" (no need to match
"<br/>", "<br />", "<BR>"...)
Thus this function only removes PHP-added BRs (which "strictly reverts" meant).
The following would be even more logical, as nl2br() doesn't use both BR forms at once:
<?php
function nl2br_revert_bis($string) {
$br = preg_match('<br>[\\n\\r]',$string) ? '<br>' :
'<br />';
return preg_replace(''.$br.'([\\n\\r])', '$1',
$string);
}
?>
If you don't want to use regular expressions, here are "plain" alternatives:
<?php
function nl2br_revert_noregex($string) {
// watch for order in arrays
// (the first 2 elements are for the case nl2br() was used in old HTML mode)
return str_replace(
array("<br>\n", "<br>\r", "<br />\n",
"<br />\r"),
array("<br />\n", "<br />\r", "\n",
"\r"),
$string
);
}
function nl2br_revert_bis_noregex($string) {
$br = (strpos($string,"<br>\n")!==false ||
strpos($string,"<br>\r")!==false) ? '<br>' : '<br
/>';
return str_replace(
array($br."\n", $br."\r"),
array( "\n", "\r"),
$string
);
}
?>
http://php.net/manual/en/function.nl2br.php