NYCPHP Meetup

[nycphp-talk] What does this code do?

Dan Cech dcech at phpwerx.net
Mon Mar 3 14:48:21 EST 2008


Steve Manes wrote:
> -- rada -- wrote:
>>
>> supposedly converts Windows CRLF  to Unix LF:
>> $str =~ s/\r\n/\n/g;
> 
> Perl sed function.
> 
> There's no need to use a regex function unless you have a regex pattern 
> to match.  If you just need to remove the carriage returns, this will be 
> two or three times faster:
> 
> $str = str_replace("\r", "", $str);

While this is indeed faster than using preg, it suffers from a slightly 
different version of the same bug in the original version.  On Mac, a 
newline is \r, so this will remove all newlines from a mac-formatted 
string...not what you want.  The original version is only marginally 
better in that it leaves the mac newlines unconverted.

A simple and efficient way to convert both windows and mac newlines to 
the unix style is:

$str = str_replace(array("\r\n","\r"),"\n",$str);

This will first replace all windows newline sequences with the unix 
version, then any mac-style carriage returns.

Dan



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