Is a new line n OR r n

Question

I ve seen many developers use different methods to split a string by new lines  but i m confused which is the correct   r n OR  n only

User · Answer

For php   n should work for you   http   php net manual en language types string php

User · Answer

If you are programming in PHP  it is useful to split lines by  n and then trim   each line  provided you don t care about whitespace  to give you a  clean  line regardless   foreach  line in explode   n    data          line   trim  line

User · Answer

The given answer is far from complete  In fact  it is so far from complete that it tends to lead the reader to believe that this answer is OS dependent when it isn t  It also isn t something which is programming language dependent  as some commentators have suggested   I m going to add more information in order to make this more clear  First  lets give the list of current new line variations  as in  what they ve been since 1999      r n is only used on Windows Notepad  the DOS command line  most of the Windows API and in some  older  Windows apps   n is used for all other systems  applications and the Internet    You ll notice that I ve put most Windows apps in the  n group which may be slightly controversial but before you disagree with this statement  please grab a UNIX formatted text file and try it in 10 web friendly Windows applications of your choice  which aren t listed in my exceptions above   What percentage of them handled it just fine  You ll find that they  practically  all implement auto detection of line endings or just use  n because  while Windows may use  r n  the Internet uses  n  Therefore  it is best practice for applications to use  n alone if you want your output to be Internet friendly   PHP also defines a newline character called PHP EOL  This constant is set to the OS specific newline string for the machine PHP is running on   r n for Windows and  n for everything else   This constant is not very useful for webpages and should be avoided for HTML output or for writing most text to files  It becomes VERY useful when we move to command line output from PHP applications because it will allow your application to output to a terminal Window in a consistent manner across all supported OSes   If you want your PHP applications to work from any server they are placed on  the two biggest things to remember are that you should always just use  n unless it is terminal output  in which case you use PHP EOL  and you should also ALWAYS use   for your path separator  not      The even longer explanation   An application may choose to use whatever line endings it likes regardless of the default OS line ending style  If I want my text editor to print a newline every time it encounters a period that is no harder than using the  n to represent a newline because I m interpreting the text as I display it anyway  IOW  I m fiddling around with measuring the width of each character so it knows where to display the next so it is very simple to add a statement saying that if the current char is a period then perform a newline action  or if it is a  n then display a period    Aside from the null terminator  no character code is sacred and when you write a text editor or viewer you are in charge of translating the bits in your file into glyphs  or carriage returns  on the screen  The only thing that distinguishes a control character such as the newline from other characters is that most font sets don t include them  meaning they don t have a visual representation available    That being said  if you are working at a higher level of abstraction then you probably aren t making your own textbox controls  If this is the case then you re stuck with whatever line ending that control makes available to you  Even in this case it is a simple matter to automatically detect the line ending style of any string and make the conversion before you load your text into the control and then undo it when you read from that control  Meaning  that if you re a desktop application dev and your application doesn t recognize  n as a newline then it isn t a very friendly application and you really have no excuse because it isn t hard to make it the right way  It also means that whomever wrote Notepad should be ashamed of himself because it really is very easy to do much better and so many people suffer through using it every day

User · Answer

n is used for Unix systems  including Linux  and OSX       r n is mainly used on Windows       r is used on really old Macs   PHP EOL constant is used instead of these characters for portability between platforms

[php] Is a new line = \n OR \r\n?

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