I programmed a function that gets lines from file.
/****************************************************/
$desc_fichero= fopen($fichero,"r");
	$correcto = $correcto & $desc_fichero;
	if($desc_fichero){/***  Si el fichero se abre correctamente   ******/
		while(!feof($desc_fichero))
		{	
			$linea= fgets($desc_fichero,1000);
			$linea = trim($linea);
						
			if (!empty($linea)..........
In version 4.0.6 fgets took the file line as is(Whith all characters).In newer version 4.1.1.converts the diferent tabs to a one space.Example:
"Hi->->->How are you": 4.1.1= "Hi how are you" .
4.0.6:"Hi->->->How are you":
Thanks