Parsing file in PHP; how to detect newlines?

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 "\n", " ", and I'm not sure what to try next. A little help?

"I'm looping through the array of lines" So you already have the lines of the file split up? — user142162
– user142162, Commented Feb 11, 2011 at 1:43
Exactly. How did you get the $file array in the first place. And why are you using next() instead of a standard foreach/for? (there are reasons, but not too many)... — ircmaxell
– ircmaxell, Commented Feb 11, 2011 at 1:47
careful using next(), it advances the pointer before returning the element! (you'll miss "joe"). — jpwco
– jpwco, Commented Feb 11, 2011 at 4:20

Chris Pennycuick · Accepted Answer · 2011-02-11 02:11:12Z

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/>";
    }
}

answered Feb 11, 2011 at 2:11

Chris Pennycuick

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Nuri Hodges · Accepted Answer · 2011-02-11 03:48:10Z

0

Maybe something like this would work for you?

while($line = next($file)) {
    if(in_array($line, array("\r", "\n", "\r\n"))) {
        echo "new line";
    }
}

answered Feb 11, 2011 at 3:48

Nuri Hodges

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Comments

onof · Accepted Answer · 2011-09-01 14:45:38Z

0

I think this solution may help you guys. This works if you are parsing csv that is generated from Mac or windows. Reading csv with multilines created in Mac, gives problem i.e. you cannot read each line in a loop but all csv data is read as single line.

This problem is solved by following solution:

//My CSV contains only one column
$fileHandle = fopen("test.csv",'r');
$codesArray    = array();
count = 0;
while (!feof($fileHandle) ) {
$line = fgetcsv($fileHandle);
if($line[0]!="") {
   $data = str_replace("'", "", (nl2br ($line[0])));
   $dataArray = explode('<br />' ,$data );
   foreach($dataArray as $data) {
       $codesArray[] = trim($data);
   }
}
}
echo "<pre>";
print_r($codesArray);

edited Sep 1, 2011 at 14:45

onof

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answered Sep 1, 2011 at 11:07

Deepak Bhatta

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