How to sort an array of names by surname preserving the keys

Question

I have an array as follows:

Array(
    [27] => \'Sarah Green\',
    [29] => \'Adam Brown\',
    [68] => \'Fred Able\'
);

I\'d like

Answer 1

You can use the uasort function, which allows you to specify a custom sorting method while also preserving keys:

 'Sarah Green',
    29 => 'Adam Brown',
    68 => 'Fred Able'
);

// Perform the sort:
uasort($array, 'lastNameSort');

// Print the result:
print_r($array);
?>

Here's a demo.