Write a PHP script to sort the following associative array

<?php
echo "
Associative array : Ascending order sort by value
";
$array2=array("Sophia"=>"31","Jacob"=>"41","William"=>"39","Ramesh"=>"40"); asort($array2);
foreach($array2 as $y=>$y_value)
{
echo "Age of ".$y." is : ".$y_value."
";
}
echo "
Associative array : Ascending order sort by Key
";
$array3=array("Sophia"=>"31","Jacob"=>"41","William"=>"39","Ramesh"=>"40"); ksort($array3);
foreach($array3 as $y=>$y_value)
{
echo "Age of ".$y." is : ".$y_value."
";
}
echo "
Associative array : Descending order sorting by Value
";
$age=array("Sophia"=>"31","Jacob"=>"41","William"=>"39","Ramesh"=>"40");
arsort($age);
foreach($age as $y=>$y_value)
{
echo "Age of ".$y." is : ".$y_value."
";
}
echo "
Associative array : Descending order sorting by Key
";
$array4=array("Sophia"=>"31","Jacob"=>"41","William"=>"39","Ramesh"=>"40"); krsort($array4);
foreach($array4 as $y=>$y_value)
{
echo "Age of ".$y." is : ".$y_value."
";
} 
?>

Sample Output:

Associative array : Ascending order sort by value           
Age of Sophia is : 31                                       
Age of William is : 39                                      
Age of Ramesh is : 40                                       
Age of Jacob is : 41                                        
                                                            
Associative array : Ascending order sort by Key             
Age of Jacob is : 41                                        
Age of Ramesh is : 40                                       
Age of Sophia is : 31                                       
Age of William is : 39                                      
                                                            
Associative array : Descending order sorting by Value       
Age of Jacob is : 41                                        
Age of Ramesh is : 40                                       
Age of William is : 39                                      
Age of Sophia is : 31                                       
                                                            
Associative array : Descending order sorting by Key         
Age of William is : 39                                      
Age of Sophia is : 31                                       
Age of Ramesh is : 40  
Age of Jacob is : 41