Callback functions in PHP < 5.3

Question

I have an multidimensional array and want to do usort in zendframework.**

Following code work in PHP 5.3+, but not for the lower versions because of the callback function in usort .

usort($array, function (array $a, array $b) {
    return date('Ymdhis',$a['time']) - date('Ymdhis',$b['time']); 
});

So instead of the callback function how can I divide it and use it from external function call in ZEND FRAMEWORK.

In normal PHP script individual call is working as below.

usort($array, 'usortcallback');

function usortcallback(array $a, array $b) {
    return date('Ymdhis',$a['time']) - date('Ymdhis',$b['time']);
});

But I want workable code for Zend Framework.

Thanks, Sandeep

Answer 1

You can use create_function() , that will fork for older PHP too.

$callback = create_function(
    '$a, $b',
    'return date("Ymdhis",$a["time"]) - date("Ymdhis",$b["time"]);'
);

usort($array, $callback);