如何根据多维数组的项、数组键和值对其排序?

首先定义这两个函数:

function specific_sort($a, $b) {
    $r = more_specific($a, $b, 'controller');
    if ($r == 0) {
        $r = more_specific($a, $b, 'action');
        if ($r == 0) {
            $r = more_specific($a, $b, 'method');
        }
    }
    return $r;
}

function more_specific($a, $b, $key) {
    if (empty($a[$key])) {
        return 1;
    }
    if (empty($b[$key])) {
        return -1;
    }
    return 0;
}

然后:

$rt = array(
  array( "controller" => "somewhere", "action" => "",      "namespace" => "admin", "method" => "GET" ),
  array( "controller" => "somewhere", "action" => "index", "namespace" => "admin", "method" => "" ),
  array( "controller" => "somewhere", "action" => "index", "namespace" => "admin", "method" => "GET" )
);
usort($rt, 'specific_sort');
print '<pre>';
print_r($rt);
print '</pre>';

它应该打印出来:

Array
(
    [0] => Array
        (
            [controller] => somewhere
            [action] => index
            [namespace] => admin
            [method] => GET
        )

    [1] => Array
        (
            [controller] => somewhere
            [action] => index
            [namespace] => admin
            [method] => 
        )

    [2] => Array
        (
            [controller] => somewhere
            [action] => 
            [namespace] => admin
            [method] => GET
        )

)