Two submit buttons in one form

Two submit buttons in one form::

We can use more than one submit button in a single form. We can use more than one submit button in a single form. 
We can give each input a different value and keep the same name or different name:

#Same name Like::
<input type="submit" name="action" value="Update" />
<input type="submit" name="action" value="Delete" />

PHP Code:
if ($_POST['action'] == 'Update') 
{    
//action for update here
} else if ($_POST['action'] == 'Delete') 
{    
//action for delete
} else {    
//invalid action!
}
#Diffent Name like::

<input type="submit" name="update_button" value="Update" />
<input type="submit" name="delete_button" value="Delete" />

PHP Code:

if (isset($_POST['update_button'])) 
{    
//update action
} else if (isset($_POST['delete_button'])) 
{    
//delete action
} else {   
 //no button pressed
}