Okay, so I've got a program that converts nl2br, and prints the output to a console window. Though it prints along with the output data, the <br />. I'm fine with it and all, if I can't remove/hide it without all the output melding together, but I'd rather hide/remove it if possible. Any suggestions are thankfully accepted.
-Example-
What console says:
: Output here!<br />
What I want:
: Output here!
I've tried substr($out, 5), trim(), and that's all I could come up with. All those did was meld the output together.
It's not totally clear, but I suspect you misuderstood nl2br. As the name suggests, it adds for each "newline" a "br" before, so that in HTML (which treats newlines like spaces in text) you will see actualy the text continuing in the next line. When you print to console, the console interprets usually the newline as a newline and so a new line begins. You do not have to use nl2br if you want to output "it" to console. (See nl2br for details).
That's what nl2br() does, changes new line character \n to <br />.
If you want, take those out, you can use str_replace()
str_replace("<br \/>", "", $output);
Related
I have a system set up for users to submit their articles into my database. Since it will just be HTML, I don't want to expect them to know to type <br /> every time there's a newline, so I am using the PHP function nl2br() on the input.
I'm also providing an article modification tool, which will bring their articles back into the form (this is a different page, however) and allow them to edit it. In doing this, the <br /> elements were appearing also (with newlines still). To remedy the elements appearing (which I had expected, anyway) I added preg_replace('/<br(\s+)?\/?>/i', "\n", mysql_result($result,$i,"content")) which I had found in another question on this site. It does the job of removing the <br /> elements, but since it is replacing them with newlines, and the newlines would have remained originally anyway, every time the post is edited, more and more newlines will be added, spacing out the paragraphs more and more each time. This is something a user won't understand.
As an example, say I enter the following into the article submission form:
Hello, this is my article.
I am demonstrating a new line here.
This will convert to:
Hello, this is my article.<br />
I am demonstrating a new line here.
Notice that, even though the newline character was converted, there is still a newline in the text. In the editing form, the <br /> will be converted back to newline and look like this:
Hello, this is my article.
I am demonstrating a new line here.
Because the <br /> was converted to a newline, but there was already a newline. So I guess what I'm expecting is for it to originally be converted to something like this:
Hello, this is my article.<br />I am demonstrating a new line here.
I'm wondering ... is there a way to stop the nl2br() function from maintaining the original newlines? Might it have to do with the Windows \r\n character?
The function you're using, nl2br is used for inserting them, but not replacing them. If you want to replace \n with <br /> you just need to use str_replace. Like so:
$string = str_replace("\n","<br />",$string);
There is absolutely no need for regex in this situation.
It seems like the problem you described is not a bug, but a feature of bl2br. You could just write your own function for it, like:
<?php
function NlToBr($inString)
{
return preg_replace("%\n%", "<br>", $inString);
}
?>
I found this one in the comments of the documentation of the nl2br-function in the PHP Manual: http://php.net/manual/de/function.nl2br.php. If the one I posted did not work for you, there should be plenty more where it came from.
(Or just use the function from the other Answer that was just posted, I guess that should work, too)
This should fix it:
preg_replace('/<br(\s+)?\/?>(?!\s*\n)/i', "\n", mysql_result($result,$i,"content"))
You cannot simply remove the breaks, because they might be on the same line. This regex will replace all breaks with newline but not those that are followed by the newline.
It will leave the <br>\n in the text. Additional regex will get rid of them:
preg_replace('/<br(\s+)?\/?>/i', "", $res)
I am making a comments system in which i can accept user input with line breaks.
I don't want to show the \n or \r thing
Please help me with this
nl2br($string);
is fast and easy
They are enabled by default. If you are outputting the text to a web browser, make sure to use nl2br or the white-space attribute in CSS.
using preg_replace
simply replace it
preg_replace('/\n/'," ",$str);
\n should do the trick.
if you are trying to output a textarea, then use nl2br();
also:-
If you are trying to format your HTML source, you should use the constant PHP_EOL. The main reason being that on windows machines the EOL is \r\n and on UNIX machines it is \n. With a properly installed LAMP set up just use PHP_EOL like so.
$html.="<p>This is my HTML</p>" . PHP_EOL;
Line breaks will be stored just like any other character.
\n is an escape code that allows you to explicitly insert a line break into a string, but I don't think that it's relevant here.
The issue you're actually facing is that HTML does not impart any visual meaning to a line break. Line breaks within HTML code do not, under normal circumstances, equate to a line break on the screen.
One way to render a line break in HTML is to use a line break tag, or <br>.
In PHP, you can automatically convert line breaks to <br> with the nl2br function. Applying this to your comment text when you output it into HTML will enable you and other visitors to see the line break visually.
I'm using PHP to create some basic HTML. The tags are always the same, but the actual links/titles correspond to PHP variables:
$string = '<p style="..."><strong><i>'.$title[$i].'</i></strong>
<br>';
echo $string;
fwrite($outfile, $string);
The resultant html, both as echoed (when I view the page source) and in the simple txt file I'm writing to, reads as follows:
<p style="..."><a href="http://www.example.com
"><strong><i>Example Title
</i></strong></a></p>
<br>
While this works, it's not exactly what I want. It looks like PHP is adding a line break every time I interrupt the string to insert a variable. Is there a way to prevent this behavior?
Whilst it won't affect your HTML page at all with the line breaks (unless you are using pre or text-wrap: pre), you should be able to call trim() on those variables to remove newlines.
To find out if your variable has a newline at front or back, try this regex
var_dump(preg_match('/^\n|\n$/', $variable));
(I think you have to use single quotes so PHP doesn't turn your \n into a literal newline in the string).
My guess is your variables are to blame. You might try cleaning them up with trim: http://us2.php.net/trim.
The line breaks show up because of multi-byte encoding, I believe. Try:
$newstring = mb_substr($string_w_line_break,[start],[length],'UTF-8');
That worked for me when strange line breaks showed up after parsing html.
For some reason I can't use \n to create a linefeed when outputting to a file with PHP. It just writes "\n" to the file. I've tried using "\\n" as well, where it just writes "\n" (as expected). But I can't for the life of me figure out why adding \n to my strings isn't creating new lines. I've also tried \r\n but it just appends "\r\n" to the line in the file.
Example:
error_log('test\n', 3, 'error.log');
error_log('test2\n', 3, 'error.log');
Outputs:
test\ntest2\n
Using MAMP on OSX in case that matters (some sort of PHP config thing maybe?).
Any suggestions?
Use double quotes. "test\n" will work just fine (Or, use 'test' . PHP_EOL).
If the string is enclosed in double-quotes ("), PHP will interpret more escape sequences for special characters:
http://php.net/manual/en/language.types.string.php
\n is not meant to be seen as a new line by the end user, you must use the html <br/> element for that.
/n only affects how the html that is generated by php appears in the source code of the web page. if you go to your web page and click on 'view source' you will see php-generated html as one long line. Not pretty. That's what \n is for ; to break that php-generated html into shorter lines. The purpose of \n is to make a prettier 'view source' page.
When you run a PHP script in a browser, it will be rendered as HTML by default. If the books you’re using show otherwise, then either the code or the illustration is inaccurate. You can use “view source” to view what was sent to the browser and you’ll see that your line feeds are present.
<?php
echo "Line 1\nLine 2";
?>
This will render in your browser as:
Line 1 Line 2
If you need to send plain text to your browser, you can use something like:
<?php
header('Content-type: text/plain');
echo "Line 1\nLine 2";
?>
This will output:
Line 1
Line 2
nl2br() function use for create new line
echo nl2br("Welcome\r\n This is my HTML document", false);
The above example will output:
Welcome
This is my HTML document
I'm pretty sure you are outputting to a html file.
The problem is html ignores newlines in source which means you have to replace the newlines with <br/> if you want a newline in the resulting page display.
You need to use double quotes. Double quotes have more escape chars.
error_log("test\n", 3, 'error.log');
error_log("test2\n", 3, 'error.log');
to place the \n in double quotes try
$LOG = str_replace('\n', "\n", $LOG);
It's because you use apostrophes ('). Use quotationmarks (") instead. ' prompts PHP to use whatever is in between the apostrophes literally.
Double quotes are what you want. Single quotes ignore the \ escape. Double quotes will also evaluate variable expressions for you.
Check this page in the php manual for more.
The “\n” or “\r” or similar tags are treated as white-space in HTML and browsers. You can use the "pre" tag to solve that issue
<?php
echo "<pre>";
echo "line1 \n some text \t a tab \r some other content";
echo "</pre>";
?>
If you want to print something like this with a newline (\n) after it:
<p id = "theyateme">Did it get eaten?</p>
To print the above, you should do this:
<?php
print('<p id = "theyateme">Did it get eaten?</p>' . "\n");
?>
The client code from above would be:
<p id = "theyateme">Did it get eaten?</p>
The output from above would be:
Did it get eaten?
I know it's hard, but I always do it that way, and you almost always have to do it that way.
Sometimes you want PHP to print \n to the page instead of giving a newline, like in JavaScript code (generated by PHP).
NOTE about answer: You might be like: Why did you use print instead of echo (I like my echo). That is because I prefer print over echo and printf, because it works better in some cases (my cases usually), but it can be done fine with echo in this case.
I am facing a bit of a quandary, I need to replace a new line with <br />. Now, clearly, replacing all instances of \n did not work, as the page did not have proper linebreaks. Here is an example of some possible text:
Some text
More text
Now, this is an issue because there is no \n and I have no way to auto-insert <br />. How can I ensure that this contains proper linebreaks?
This is in PHP. I cannot serve it as plain text.
To replace new line breaks with just use nl2br
Maybe you want http://php.net/nl2br? Or maybe I have misunderstood...
You will want to use nl2br.
Your text has to have a newline (\n) or carriage return (\r) if the text is on 2 different lines.
nl2br will handle either case.
php has a built in function for that.
nl2br() i believe.