convert ending line of a file with a php script - php

Question

I'd like to know if it's possible to convert the endings lines mac (CR : \r) to windows (CRLF : \r\n) with a php script.
Indeed I've got a php script which run periodically on my computer to upload some files on a FTP server and the ending lines need to be changed before the upload. It's easy to do it manually but I would like to do it automatically.

Answer 1

Can you just use a simple regular expression like the following?
function normalize_line_endings($string) {
return preg_replace("/(?<=[^\r]|^)\n/", "\r\n", $string);
}
It's probably not the most elegant or fastest solution but it should work pretty well (i.e it won't mess up existing Windows (CRLF) line-endings in a string).
Explanation
(?<= - Start of a lookaround (behind)
[^\r] - Match any character that is not a Carriage Return (\r)
| - OR
^ - Match the beginning of the string (in order to capture newlines at the start of a string
) - End of the lookaround
\n - Match a literal LineFeed (\n) character

Answer 2

Basically load the file to a string and call something like :
function normalize($s) {
// Normalize line endings
// Convert all line-endings to UNIX format
$s = str_replace(array("\r", "\n"), "\r\n", $s);
// Don't allow out-of-control blank lines
$s = preg_replace("/\r\n{2,}/", "\r\n\r\n", $s);
return $s;
}
This is a snippet from here, last regeg might need some further tinkering with.
Edit: Fixed logic to remove duplicate replacements.

Answer 3

In the end the safer way is to change what you don't want replaced first, here my function :
/**Convert the ending-lines CR et LF in CRLF.
*
* #param string $filename Name of the file
* #return boolean "true" if the conversion proceed without error and else "false".
*/
function normalize ($filename) {
echo "Convert the ending-lines of $filename into CRLF ending-lines...";
//Load the content of the file into a string
$file_contents = #file_get_contents($filename);
if (!file_contents) {
echo "Could not convert the ending-lines : impossible to load the file.PHP_EOL";
return false;
}
//Replace all the CRLF ending-lines by something uncommon
$DontReplaceThisString = "\r\n";
$specialString = "!£#!Dont_wanna_replace_that!#£!";
$string = str_replace($DontReplaceThisString, $specialString, $file_contents);
//Convert the CR ending-lines into CRLF ones
$file_contents = str_replace("\r", "\r\n", $file_contents);
//Replace all the CRLF ending-lines by something uncommon
$file_contents = str_replace($DontReplaceThisString, $specialString, $file_contents);
//Convert the LF ending-lines into CRLF ones
$file_contents = str_replace("\n", "\r\n", $file_contents);
//Restore the CRLF ending-lines
$file_contents = str_replace($specialString, $DontReplaceThisString, $file_contents);
//Update the file contents
file_put_contents($filename, $file_contents);
echo "Ending-lines of the file converted.PHP_EOL";
return true;
}

Answer 4

I tested it but there's some error : it seems that instead of replacing the CR ending-line it add a CRLF ending-line, here's the function, i slightly modified it to avoid to open the file outside this function :
// FONCTION CONVERTISSANT LES FINS DE LIGNES CR TO CRLF
function normalize ($filename) {
echo "Convert the ending-lines of $filename... ";
//Load the file into a string
$string = #file_get_contents($filename);
if (!string) {
echo "Could not convert the ending-lines : impossible to load the file.\n";
return false;
}
//Convert all line-endings
$string = str_replace(array("\r", "\n"), "\r\n", $string);
// Don't allow out-of-control blank lines
$string = preg_replace("/\r\n{2,}/", "\r\n", $string);
file_put_contents($filename, $string);
echo "Ending-lines converted.\n";
return true;
}

Answer 5

it might be easier to remove all \r characters and then replace \n with \r\n.
this will take care of all variations:
$output = str_replace("\n", "\r\n", str_replace("\r", '', $input));