问题
It is said, that fopen can use t mode to convert \n to \r\n. So, questions:
1) How should i use t mode when i need to read and write (r+)? Should it be r+t or rt+ or tr+? Same question for b, should i write r+b or how?
2) I've tried all variants on debian linux to convert file, that contains only \n to \r\n using magic mode t (wanna understand how it works). But it does not work. What am I doing wrong? When t mode works?
Here is my code:
// Write string with \n symbols
$h = fopen('test.file', 'wt');
fwrite($h, "test \ntest \ntest \n"); // I've checked, after file is being created
fclose($h); // \n symbols are not substituted to \r\n
// Open file, that contains rows only with \n symbols
$h = fopen('test.file', 'rt');
$data = fread($h, filesize('test.file'));
fclose($h);
// I want to see what's inside
$data = str_replace("\n", '[n]', $data);
$data = str_replace("\r", '[r]', $data);
// finally i have only \n symbols, \r symbols are not added
var_dump($data);
回答1:
From: http://php.net/fopen
Windows offers a text-mode translation flag ('t') which will transparently translate \n to \r\n when working with the file. In contrast, you can also use 'b' to force binary mode, which will not translate your data. To use these flags, specify either 'b' or 't' as the last character of the mode parameter.
So no Linux. Also, according to the spec r+t or r+b would be correct (but only on Windows).
来源：https://stackoverflow.com/questions/17239731/fopen-t-compatibility-mode-in-php