Question

What would be the best way to detect newline return method in PHP. CR, LF or CR+LF

And if possible convert it to specified type.

Answer 1

define('NL_NIX', "\n");
define('NL_WIN', "\r\n");
define('NL_MAC', "\r");


function newline_type($string)
{
    if (strpos($string, NL_WIN) !== false) {
        return NL_WIN;
    } elseif(strpos($string, NL_MAC) !== false) {
        return NL_MAC;
    } elseif(strpos($string, NL_NIX) !== false) {
        return NL_NIX;
    }
}

Checks what kind of newline is in the string. 0 is returned when no newline is found.

To normalize/standardize all newlines use the following function:

function newline_convert($string, $newline)
{
    return str_replace(array(NL_WIN, NL_MAC, NL_NIX), $newline, $string);
}

Hope it helps!