$n = 0;

while (true) {

$n++;

//echo $n.PHP_EOL;

file_put_contents('./test_log.txt', $n.PHP_EOL,FILE_APPEND);

if($n >= 10){

break;

}

sleep(1);

}

exec("E:\wamp64\bin\php\php7.0.10\php.exe testindex.php")