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<form enctype=multipart/form-data action=index.php?submit=true method=POST>
logfile <input name=lfile type=file><br>
<input type=submit value=analyze>
</form>

<?php
if(isset($_GET[submit]) && $_GET[submit] == "true") {
  $tpath = "logs/";
  $tpath = $tpath.basename($_FILES['lfile']['name']); 

  if(move_uploaded_file($_FILES['lfile']['tmp_name'], $tpath)) {
    $fh = fopen("logs/".$_FILES['lfile']['name'], 'r');
    $data = fgets($fh);
    echo $data;
    fclose($fh);
  } else{
    echo "error";
  }
}
?>