I've submitted this bug some days before but I didn't get very kind reply. I decided to resubmit it.

test.php:
<?php
	$fp = fopen("test.txt", "r");
	$str = "";
	while (!feof($fp)) $str .= fgets($fp, 64);
	fclose($fp);
	echo count(split("\n", $str))."<br />".count(split("\r\n", $str));
?>

And I've put 3 random lines in test.txt
OK, my PHP is running as Apache module, so when I type "localhost/test.php", I got the output "3<br />1".

Then, I run this script in CGI mode. This can be done simply by the command "c:\php_path\php.exe test.php", and I will get the output "3<br />3".

OK, so PHP is not portable, even in the same platform but different PHP running mode. CGI PHP and module PHP interpret "\r\n" differently.