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<?
$file = "test.txt";

$f = file($file);

// first line
echo $f[0];
// result test line 1 

echo "<br />";

// end line
echo end($f);
// result test line 3 

echo "<br />";

// second line
echo $f[1];
// result test line 2 

echo "<br />";

// line 2 - 3
$arr = array_slice($f,1,2);
$str = implode(",", $arr);
echo $str;
// result test line 2  test line 3 
?>