On Jul 2, 2011, at 3:01 AM, Karl DeSaulniers wrote:
Hello All,
Happy pre independence for my American PHPers. And good health to
all others.
Have a quick question..
I have this code I use for the end of line characters used in my
mailers.
[Code]
// Is the OS Windows or Mac or Linux
if (strtoupper(substr(PHP_OS,0,5)=='WIN')) {
$eol="\r\n";
} else if (strtoupper(substr(PHP_OS,0,5)=='MAC')) {
$eol="\r";
} else {
$eol="\n";
}
[End Code]
Does this suffice or should I be using the php supplied end of line?
$eol=PHP_EOL;
Or do these do the same thing?
What advantages over the code I use does the PHP_EOL have?
Or does it not matter with these and either are good to go?
It seems to me that they do the same thing.. am I on the right track
or missing something?
Is there any other OS's that are not WIN or MAC and use the "\r" or
"\r\n" ?
If their are, then I can see an advantage of using the PHP_EOL.
Like I said, just a quick question. ;)
Karl DeSaulniers
Design Drumm
http://designdrumm.com
What's interesting is that the SMTP standard actually requires a CRLF,
even in unix-land, so PHP_EOL may not work as intended if you're using
it there.
From RFC-2821:
2.3.7 Lines
SMTP commands and, unless altered by a service
extension, message data, are transmitted in "lines". Lines
consist
of zero or more data characters terminated by the sequence
ASCII
character "CR" (hex value 0D) followed immediately by ASCII
character "LF" (hex value 0A). This termination sequence is
denoted
as <CRLF> in this document. Conforming implementations MUST NOT
recognize or generate any other character or character sequence
as a line terminator. Limits MAY be imposed on line lengths by
servers (see section 4.5.3).
In addition, the appearance of
"bare" "CR" or "LF" characters in text (i.e., either without
the
other) has a long history of causing problems in mail
implementations
and applications that use the mail system as a tool. SMTP
client
implementations MUST NOT transmit these characters except when
they are intended as line terminators and then MUST, as
indicated
above, transmit them only as a <CRLF> sequence.
The old sendmail operated this way. I believe more modern MTAs handle
either CRLF, CR, or LF terminated lines on input, so in practice it
may not matter.
Also, as of OSX, Mac uses LF as the line terminator character, not CR,
although I think it will handle either as a backwards compatibility
feature. Elsewhere, such as in browser output, PHP_EOL is the best bet
to cause a line termination outside of mail applications.
In actual practice, however, PHP_EOL may be less useful than it would
appear, as it only provides the appropriate line terminator based on
the host it is running on. If your server is running a flavour of
unix, and your running on windows, for example, the server will output
'\n' to your browser, not '\r\n' as Windows would like. I believe all
the modern browsers, regardless of platform OS, handle all three CRLF,
CR, and LF and treat them as line terminators. However if you dump the
return from the server to a file, you won't see this behaviour,
obviously.
There's a pretty long thread on this at stackoverflow.com:
http://stackoverflow.com/questions/128560/when-do-i-use-the-php-constant-php-eol
I tend to use PHP_EOL inplace of specifying a "\n" character string
because to me it is clearer and more obvious what I mean, and does
make the code at least a bit more portable.
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