Php real file monitoring

tail.php

<?php
declare(ticks=1);
$file = __DIR__ . '/scratch.log';

$f = popen(sprintf('tail -n 0 -f %s', escapeshellarg($file)), 'rb');

while (feof($f) === false) {
    $buffer = fgets($f);
    echo "Line: $buffer";
    usleep(1000);
}

fclose($f);

echo "End\n";