<?php
$file = 'data.txt';  
$content = file_get_contents($file);  
echo $content; 
?>

<?php
$txt=file('data.txt');
echo $txt[3];        //It will show you line 4. because the beginning number is 0
?>

<?php
$arr=file('data.txt');//txt name
$n=count($arr)-1;
for ($i=1;$i<=10;$i++){//Display 10 lines
  $x=rand(0,$n);
  echo $arr[$x],"\n";
}
?>

<?php
$a = file("data.txt");
$b = count($a);
$c = $b-20;
for($i=$c;$i<$b;$i++)
{
  echo $a[$i]."\n";
}
?>

<?php
$txt=file('data.txt');
echo implode("\n", array_slice($txt,-20,20)); 
?>