PHP - Lectura de Archivos TXT

$file = file('archivo.txt');

$result = '';

foreach ($file as $line) {

    $vals = explode(',', $line);

    for ($i = 0, $s = count($vals); $i < $s; $i += 2) {

        $temp = $i + 1;

        if (isset($vals[$temp])) {

            $result .= sprintf("(%d, %d)\n", $vals[$i], $vals[$temp]);

        } else {

            $result .= sprintf("(%d, 0)\n", $vals[$i]);

        }

    }

}

echo $result;

$file = file('archivo.txt');

$result = array_reduce($file, function($return, $line) {

    $vals = explode(',', $line);

    while (pos($vals)) {

        $return .= sprintf("(%d, %d)\n", pos($vals), next($vals));

        next($vals);

    }

    return $return;

});

echo $result;

$file = file('archivo.txt');

$result = array_reduce($file, function($return, $line) {

    $vals = explode(',', $line);

    $format = str_repeat("(%d, %d)\n", floor(count($vals)/2));

    $format .= (count($vals) % 2 > 0) ? "(%d, 0)\n" : '' ;

    return $return .= vsprintf($format, $vals);

});

echo $result;

(1, 2)

(3, 3)

(2, 4)

(5, 0)

(2, 3)

(4, 5)

(65, 3)

(23, 1)

(5, 3)

(32, 1)

(2, 2)

(3, 4)

(5, 0)