用PHP解析文件; 如何检测换行？

Question

I've got a problem where I'm trying to read a text file like this:

Joe
Johnson

Linus
Tourvalds

and while parsing it in php, I need to be able to detect the newlines. I'm trying to correctly define $newline. I'm looping through the array of lines in the $file variable.

while($line = next($file))
    if($line = $newline)
        echo "new line";

The problem is that I can't seem to match the newline character. I know that it is actually showing up in the $file array, because this:

while($line = next($file))
    echo $line;

outputs the file verbatim, with newlines and all. I've already tried " ", " ", and I'm not sure what to try next. A little help?

Answer 1

$file = file("path/to/file.txt");

// Incase you need to call it multiple times ...
function isNewLine($line) {
    return !strlen(trim($line));
}

foreach ($file as $line) {
    if (isNewLine($line)) {
        echo "new line<br/>";
    }
}