Write a PHP script to put a string in an array

<?php
$str = "Twinkle, twinkle, little star,\nHow I wonder what you are.\nUp above the world so high,\nLike a diamond in the sky.";
$arra1 = explode("<br>", $str);
var_dump($arra1);
?>

Sample Output:

array(1) {                                                  
  [0]=>                                                     
  string(112) "Twinkle, twinkle, little star,               
How I wonder what you are.                                  
Up above the world so high,                                 
Like a diamond in the sky."                                 
}