Write a PHP function to convert a string to an array (trimming every line and remove empty lines)

<?php
 $string = "  IANA is the global coordinator of the DNS root. 
The root is the upper-most part of the DNS hierarchy, 
and involves delegating administrative responsibility 
of “top-level domains”, which are the last segment of 

a domain name, such as .com, .uk and .nz. Part of this 
task includes evaluating requests to change the operators 

of country code domains, as well as day-to-day maintenance
of the details of the existing operators. ";
$result = array_filter(array_map('trim', explode("\n", $string)), 'strlen');
print_r($result);
?>

Sample Output:

Array                                                       
(                                                           
    [0] => IANA is the global coordinator of the DNS root.  
    [1] => The root is the upper-most part of the DNS hierar
chy,                                                        
    [2] => and involves delegating administrative responsibi
lity                                                        
    [3] => of “top-level domains”, which are the last segmen
t of                                                        
    [5] => a domain name, such as .com, .uk and .nz. Part of
 this                                                       
    [6] => task includes evaluating requests to change the o
perators                                                    
    [8] => of country code domains, as well as day-to-day ma
intenance                                                   
    [9] => of the details of the existing operators.        
)