Explode PHP string by new line [duplicate]

Question

Simple, right? Well, this isn't working :-\

$skuList = explode('\n\r', $_POST['skuList']);

Answer 1

Best Practice

As mentioned in the comment to the first answer, the best practice is to use the PHP constant PHP_EOL which represents the current system's EOL (End Of Line).

$skuList = explode(PHP_EOL, $_POST['skuList']);

PHP provides a lot of other very useful constants that you can use to make your code system independent, see this link to find useful and system independent directory constants.

Warning

These constants make your page system independent, but you might run into problems when moving from one system to another when you use the constants with data stored on another system. The new system's constants might be different from the previous system's and the stored data might not work anymore. So completely parse your data before storing it to remove any system dependent parts.

UPDATE

Andreas' comment made me realize that the 'Best Practice' solution I present here does not apply to the described use-case: the server's EOL (PHP) does not have anything to do with the EOL the browser (any OS) is using, but that (the browser) is where the string is coming from.

So please use the solution from @Alin_Purcaru to cover all your bases:

$skuList = preg_split('/\r\n|\r|\n/', $_POST['skuList']);

Answer 2

Cover all cases. Don't rely that your input is coming from a Windows environment.

$skuList = preg_split("/\\r\\n|\\r|\\n/", $_POST['skuList']);

or

$skuList = preg_split('/\r\n|\r|\n/', $_POST['skuList']);

Answer 3

Try "\n\r" (double quotes) or just "\n".

If you're not sure which type of EOL you have, run a str_replace before your explode, replacing "\n\r" with "\n".

Answer 4

It doesn't matter what your system uses as newlines if the content might be generated outside of the system.

I am amazed after receiving all of these answers, that no one has simply advised the use of the \R escape sequence. There is only one way that I would ever consider implementing this in one of my own projects. \R provides the most succinct and direct approach.

https://www.php.net/manual/en/regexp.reference.escape.php#:~:text=line%20break:%20matches%20\n,%20\r%20and%20\r\n

Code: (Demo)

$text = "one\ntwo\r\nthree\rfour\r\n\nfive";

var_export(preg_split('~\R~', $text));

Output:

array (
  0 => 'one',
  1 => 'two',
  2 => 'three',
  3 => 'four',
  4 => '',
  5 => 'five',
)

If you don't want empty elements in your output, then: Demo

• split on one or more newline sequences via regex engine

  var_export(preg_split('~\R+~', $text));  // may generate empty element at start and/or end of array
  

• remove elements with no length

  var_export(preg_split('~\R~', $text, -1, PREG_SPLIT_NO_EMPTY));
  

• [BEST] split on one or more newline sequences via regex engine AND remove elements with no length

  var_export(preg_split('~\R+~', $text, -1, PREG_SPLIT_NO_EMPTY)); 
  

---

As a consideration for scenarios where the input string may contain multibyte/unicode/accented/diacritic/non-latin characters, add the u pattern modifier to inform the regex engine to process the input string as multibute characters instead of individual bytes. ~\R+~u

Answer 5

Lots of things here:

• You need to use double quotes, not single quotes, otherwise the escaped characters won't be escaped.
• The normal sequence is \r\n, not \n\r.
• Depending on the source, you may just be getting \n without the \r (or even in unusual cases, possibly just the \r)

Given the last point, you may find preg_split() using all the possible variants will give you a more reliable way of splitting the data than explode(). But alternatively you could use explode() with just \n, and then use trim() to remove any \r characters that are left hanging around.

Answer 6

try

explode(chr(10), $_POST['skuList']);

Answer 7

this php function explode string by newline

Attention : new line in Windows is \r\n and in Linux and Unix is \n
this function change all new lines to linux mode then split it.
pay attention that empty lines will be ignored

function splitNewLine($text) {
    $code=preg_replace('/\n$/','',preg_replace('/^\n/','',preg_replace('/[\r\n]+/',"\n",$text)));
    return explode("\n",$code);
}

example

$a="\r\n\r\n\n\n\r\rsalam\r\nman khobam\rto chi\n\rche khabar\n\r\n\n\r\r\n\nbashe baba raftam\r\n\r\n\r\n\r\n";
print_r( splitNewLine($a) );

output

Array
(
    [0] => salam
    [1] => man khobam
    [2] => to chi
    [3] => che khabar
    [4] => bashe baba raftam
)

Answer 8

To preserve line breaks (as blank items in the array):

$skuList = preg_split('/\r\n|\n\r|\r|\n/', $_POST['skuList']);`

This handles the unusual \n\r as well as the usual \n\r, \n and \r. Note that the solution from @Alin_Purcaru is very similar, but doesn't handle \n\r.

To remove line breaks (no blank items in the array):

$skuList = preg_split('/[\r\n]+/', $_POST['skuList']);

PHP Tests
These expressions has been tested on the following OS'es: ubuntu-20.04, ubuntu-18.04, windows-2022, windows-2019, windows-2016, macos-11, macos-10.15 and in the following PHP versions: 8.0, 7.4, 7.3, 7.2, 7.1, 7.0

Here is the PHP test class:
https://github.com/rosell-dk/exec-with-fallback/blob/main/tests/LineSplittingTest.php

And a successful CI run on a project that runs those tests:
https://github.com/rosell-dk/exec-with-fallback/actions/runs/1520070091

Javascript demos of the principle
Here are some javascript demos of similar regular expressions (I'm using N and R instead of \n and \r).

Preserve linebreaks demo: https://regexr.com/6ahvl
Remove linebreaks demo: https://regexr.com/6ai0j

PS: There is currently a bug in regexr which causes it to show "Error" when first loaded. Editing the expression makes the error go away

Answer 9

For a new line, it's just

$list = explode("\n", $text);

For a new line and carriage return (as in Windows files), it's as you posted. Is your skuList a text area?

Answer 10

Place the \n in double quotes:

explode("\n", $_POST['skuList']);

In single quotes, if I'm not mistaken, this is treated as \ and n separately.

Answer 11

Have you tried using double quotes?

Answer 12

As easy as it seems

$skuList = explode('\\n', $_POST['skuList']);

You just need to pass the exact text "\n" and writing \n directly is being used as an Escape Sequence. So "\\" to pass a simple backward slash and then put "n"

Answer 13

Not perfect but I think it must be safest. Add nl2br:

$skuList = explode('<br />', nl2br($_POST['skuList']));

Answer 14

First of all, I think it's usually \r\n, second of all, those are not the same on all systems. That will only work on windows. It's kind-of annoying trying to figure out how to replace new lines because different systems treat them differently (see here). You might have better luck with just \n.

Answer 15

Losing line breaks from posting from input textboxes?
What works faster for me is to copy paste any text or Excel or HTML table type or newline type of data and paste it into a textarea instead of an inputextbox: this keeps the linebreaks intact in the POST.

 <textarea  id="txtArea" name="txtArea" rows="40" cols="170"></textarea>
 <br>
 <input type="submit" value="split lines into array" /> 

in the form receiving file:

 $txtArea ='';  
 $txtArea = $_POST['txtArea'];  
 $TA = $_POST['txtArea'];  
 $string = $TA;  
 $array = preg_split ('/$\R?^/m', $string); 
// or any of these: 
// $array = explode(PHP_EOL,$string);  
// $array = explode("\n", $txtArea); 
 echo "<br>A0: ".$array[0];
 echo "<br>A1: ".@$array[1];
 echo "<br>A2: ".@$array[2];

Answer 16

PHP_EOL is ostensibly used to find the newline character in a cross-platform-compatible way, so it handles DOS/Unix issues.

Try this:

$myString = "Prepare yourself to be caught
You in the hood gettin' shot
We going throw hell of blows
got my whole frame froze";

$myArray = explode(PHP_EOL, $myString);

print_r($myArray);

Answer 17

Here is what worked for me. Tested in PHP 5.6 as well as as PHP 7.0:

    $skuList = str_replace("\\r\\n", "\n", $_POST['skuList']);
    $skuList = str_replace("\\n\\r", "\n", $skuList);

    $skuList = preg_split("/\n/", $skuList);
    print_r($skuList);

Answer 18

This method always works for me:

$uniquepattern="@#$;?:~#abcz"//Any set of characters which you dont expect to be present in user input $_POST['skuList'] better use atleast 32 charecters.
$skuList=explode($uniquepattern,str_replace("\r","",str_replace("\n",$uniquepattern,$_POST['skuList'])));

Answer 19

Try this:

explode(PHP_EOF, $lines);