Every time I try to echo a string there is no new line. I how can I make a newline when calling echo in php using the $_GET?
here is my code:
<?php
$text = "Hello world";
$text2 = $_GET['msg'];
echo $text2
?>
and this is what I enter in the url:
http://localhost/hello.php?msg=hello%0Dworld
or this one:
http://localhost/hello.php?msg=hello%0Aworld
and even this one:
http://localhost/hello.php?msg=hello%0D%0Aworld
The echo has to be a newline please don't say I should use a different method than $_GET. It has to be $_GET
While performing your exercises you are creating an HTML page.
HTML is a special markup language, which renders according to set of rules, some of them are:
<> characters has a special meaning of control structures named tags
all newline characters are ignored
to make a newline on the page, one have to use suitable tag - such as <br>, <p> or whatever.
So, to make a newline appear on your page, you have to convert newline characters to tags. Either use nl2br() function to get a <br /> tag or str_replace() if you want any other one
Be aware that echoing any request variables without validating them is a considerable security risk! If you want to publish any application with this code it needs to be redesigned.
As common sense states, the conversion from urlencoded to the corresponding character is automatically done by php, but HTML does not render such characters, so you either need to convert them into linebreaks or enclose the message in <pre> tags.
Related
if im not wrong \n representation means that a newline as <br> .But when i use <br> or another tags they work properly but escape sequences.
example
echo "write somethings<br>";
echo "about coding";
above example works fine but when i try to use escape sequences none of them are not working
echo "write something\n";
echo "about coding";
it's just an example for newline character and the other escaping characters dont work as \n.What is the real logic on this case?
\n and other similar escape sequences are not part of HTML. You should use HTML escape sequences. These can be found here: http://www.theukwebdesigncompany.com/articles/entity-escape-characters.php
So only your <br> tag works but \n is not
No, this is an example of HTML rules.
Putting \n in a PHP string and then outputting it as HTML will put a new line character in the HTML source code. It's just line pressing return when writing raw HTML.
HTML puts no special meaning on the new line character (at least outside of script elements and elements with various non-default values of the CSS white-space property) and treats it like any other white space character.
<br>, on the other hand, is a line break element (but usually an indication that you should be using a block level element around the content instead).
HTML ignores carriage return and linefeed characters, treating them as whitespace. If you want to use display a string formatted with "\n" you can use nl2br to convert it, e.g.
echo nl2br("this is on\ntwo lines");
If you look at this in the browser it wont work : browser knows only HTML for display (<br>) but not escape like \n or \r
I have a textarea, which I need to be able to take characters including / and ' as well as special characters in ASCII. It does this fine, and sends the data to a php page by the POST method.
Then I repopulate the text area simply by putting
<?php echo isset($F_Text) ? $F_Text : '' ?>
between the textarea tags ($F_Name = $_POST["F_Name"]), with the intention that the user can then alter what they typed in and resubmit.
But each time the form is repopulated two issues arise. A forward slash is added before characters such as ' and the ASCII characters are printed out as the symbol rather than the code. This basically breaks the rest of the page (the submission goes on to be processed by some javascript).
I can't think of any way to keep the ASCII codes as just that, codes, not symbols.
Also, I've just noticed that all $ signs are lost too, which I can understand, but I need them to stay!
I need the form to display EXACTLY what the user typed in originally. Any ideas?
Can you try with :
<?php echo isset($F_Text) ? htmlentities(stripslashes($F_Text)) : '' ?>
Hope this helps you :)
My guess would be that you first have to turn of magic quotes, then use htmlspecialchars to avoid that your variable messes up your html and then make sure everything is in utf8 so that all special characters are retained (depending on what you consider ASCII characters...).
Your php echo statement would be:
<?php echo isset($F_Text) ? htmlspecialchars($F_Text) : '' ?>
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'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.
How can you preserve "enters" given by the user in the database and show them then to other users?
I store the question of the user and use the following functions to sanitize the user data, prepare it, and execute the SQL command, respectively.
pg_escape_string
pg_prepare
pg_execute
I use htmlentities with ENT_QUOTES to convert the data HTML.
This procedure removes all enters, apparently in the form \n, in the question.
I would like to have a similar question-system as in SO: to show only double enters to users as line breaks.
After you call htmlentities(), call nl2br(). The web browser ignores plain newline characters so you need to convert them to <br /> elements to make them show up.
nl2br — Inserts HTML line breaks before all newlines in a string
Description
string nl2br ( string $string [, bool $is_xhtml= true ] )
Returns string with <br /> or <br> inserted before all newlines.
For example:
echo nl2br(htmlentities($input));
To only show double newlines and ignore single ones, you could instead use a more sophisticated string replacement function, preg_replace:
echo preg_replace('/\n\s*\n/', "<br />\n<br />\n", htmlentities($input));
Here '/\n\s*\n/' matches a newline, followed by any amount of whitespace, followed by another newline. It replaces any such substring with two <br /> elements. Single newlines are ignored. It's also nice because it'll ignore extraneous spaces and tabs that are invisible, such as if a user typed this:
This is a paragraph.\n
It is pretty short.\n
<space><tab>\n
Here's another paragraph.\n
It too is short.
PHP's nl2br() function should do the trick and allow you to convert \n characters to <br> html tags.
To enable the "two enters for a newline" behavior, you should run a regex to turn every pair of consecutive <br> tags into a single <br> tag (you could also do this with \n characters before running nl2br() on the text).