Is this the most efficient way to get and remove first line in file?

Question

I have a script which, each time is called, gets the first line of a file. Each line is known to be exactly of the same length (32 alphanumeric chars) and terminates with \"

Answer 1

I think this is best for any file size

$myfile = fopen("yourfile.txt", "r") or die("Unable to open file!");
$ch=1;

while(!feof($myfile)) {
  $dataline= fgets($myfile) . "
";
  if($ch == 2){
  echo str_replace(' ', ' ', $dataline)."\n";
  }
  $ch = 2;
} 
fclose($myfile);