如果你想根据多个标准的绝对最大值对数组进行排序，这里有一个简单的方法:

usort($arr, function($item, $nextItem) {
    return (max($nextItem->firstNumber, $nextItem->secondNumber)) - (max($item->firstNumber, $item->secondNumber));
});

例子:

$foo = new stdClass;
$foo->createdDate = '10';
$foo->uploadedDate = '5';

$bar = new stdClass;
$bar->createdDate = '1';
$bar->uploadedDate = '12';

$baz = new stdClass;
$baz->createdDate = '25';
$baz->uploadedDate = '0';


$arr = [$foo, $bar, $baz];

// Order array by the highest number between "createdDate" and "uploadedDate".
usort($arr, function($item, $nextItem) {
    return (max($nextItem->createdDate, $nextItem->uploadedDate)) - (max($item->createdDate, $item->uploadedDate));
});

结果:

array (
  0 => 
  (object) array(
     'createdDate' => '25',
     'uploadedDate' => '0',
  ),
  1 => 
  (object) array(
     'createdDate' => '1',
     'uploadedDate' => '12',
  ),
  2 => 
  (object) array(
     'createdDate' => '10',
     'uploadedDate' => '5',
  ),
)

使用Nspl中的sorted function对数组进行排序非常方便:

基本分类

// Sort array
$sorted = sorted([3, 1, 2]);

// Sort array in descending order
$sortedDesc = sorted([3, 1, 2], true);

按函数结果排序

// Sort array by the result of a given function (order words by length)
$sortedByLength = sorted(['bc', 'a', 'abc'], 'strlen');
$sortedByLengthDesc = sorted(['bc', 'a', 'abc'], true, 'strlen');

// Sort array by the result of user-defined function (order words by the 1st character)
$sortedByTheFirstCharacter = sorted(['bc', 'a', 'abc'], function($v) { return $v[0]; }); 

// Which is the same as
$sortedByTheFirstCharacter = sorted(['bc', 'a', 'abc'], itemGetter(0));
$sortedByTheFirstCharacterDesc = sorted(['bc', 'a', 'abc'], true, itemGetter(0));

// itemGetter(0) returns a function which takes an argument with access by index/key
// and returns the value at index 0

多维数组排序

// Sort multidimensional array (sort list of users by their names)
$users = [
    array('name' => 'Robert', 'age' => 20),
    array('name' => 'Alex', 'age' => 30),
    array('name' => 'Jack', 'age' => 25),
];
$sortedByName = sorted($users, itemGetter('name'));
$sortedByNameDesc = sorted($users, true, itemGetter('name'));

// itemGetter('name') returns a function which takes an argument with access by index/key
// and returns the value of the 'name' key

对象排序数组

// Lets assume we have class User(name, age) with properties name and age
// and public methods getName() and getAge()
$users = [
    new User('Robert', 20),
    new User('Alex', 30),
    new User('Jack', 25),
];

// Sort list of objects by property value (sort list of users by their name)
$sortedByName = sorted($users, propertyGetter('name'));
$sortedByNameDesc = sorted($users, true, propertyGetter('name'));

// propertyGetter('name') returns a function which takes an object
// and returns the value of its 'name' property

// Sort list of objects by method result (sort list of users by their age)
$sortedByAge = sorted($users, methodCaller('getAge'));
$sortedByAgeDesc = sorted($users, true, methodCaller('getAge'));

// methodCaller('getAge') returns a function which takes an object
// and returns the result of its getAge() method

用比较函数排序

// Sort with a comparison function (order words lexicographically with strcmp)
$sortedLexicographically = sorted(['bc', 'a', 'abc'], false, null, 'strcmp');

// Sort with user-defined comparison function (order words by the 1st character)
$sortedByTheFirstCharacter = sorted(['bc', 'a', 'abc'], false, null, function($v1, $v2) {
    return chr($v1[0]) - chr($v2[0]);
});

你可以在这里看到所有这些例子。

在PHP 5.3的闭包中，也可以使用闭包来确定排序的顺序。

例如，假设$array是一个包含month属性的对象数组。

 $orderArray = array("Jan","Feb","Mar","Apr","May","June","July","Aug","Sept","Oct","Nov","Dec");

 usort($array, function($a, $b) use ($orderArray){
       return array_search($a->month, $orderArray) - array_search($b->month, $orderArray);
 }); 

这个答案是关于多列排序的，其中数组应该在每个一维元素中根据非连续索引的值进行排序。 这与多维排序不同，因为每个元素只由不同的Key=>Value对组成。

function fncCmp( array $ItmOne, array $ItmTwo ) {       ; # callback for sorting items (which are arrays) by values at specific indexes
  $strCmpOne = $ItmOne[ 'ColOne' ] . $ItmOne[ 'ColThr' ]; # build compound values
  $strCmpTwo = $ItmTwo[ 'ColOne' ] . $ItmTwo[ 'ColThr' ]; #   to compare
  return $strCmpOne <=> $strCmpTwo                      ; # pass back comparison-result
} # fncCmp

$arrDat = array(                                                       # define an array of items
  array( 'ColOne' => 'Val2', 'ColTwo' => 'Val8', 'ColThr' => 'Val6' )  #   each of which
 ,array( 'ColOne' => 'Val2', 'ColTwo' => 'Val9', 'ColThr' => 'Val4' )  #   is an
 ,array( 'ColOne' => 'Val1', 'ColTwo' => 'Val7', 'ColThr' => 'Val5' )  #   array of
)                                                                    ; #   fields
var_dump       ( $arrDat           )                                 ; # emit items before sort
$bolSrt = usort( $arrDat, 'fncCmp' )                                 ; # sort the array by comparing elements
var_dump       ( $arrDat           )                                 ; # emit items after  sort

最简单的方法是使用usort函数对数组进行排序，而不需要任何循环: 下面是一个例子:

   $array_compare= array("0" =>4,"1"=>2,"2"=>500,"3"=>100);

这将按降序排序:

usort($array_compare, function($a, $b) {
        return ($b['x1'] - $a['x1']) > 0 ? 1 :-1;
    });

这将按发送顺序排序:

usort($array_compare, function($a, $b) {
        return ($b['x1'] - $a['x1']) < 0 ? 1 :-1;
    });

按键值进行多维排序

按键值对多维数组进行自然排序，并保持原始顺序(不打乱主键):

function multisortByKeyValue( $k, $arr ) {
    $ids   = array();
    $index = 1;

    foreach ( $arr as $key => $row ) {
        $ids[ $key ] = intval( $row[ $k ] ) . '-' . $index . '-' . $key;
        $index ++;
    }

    natsort( $ids );

    $arr = array_merge( $ids, $arr );

    return $arr;
}

测试用例:

$arr = array(
    'id1' => array(
        'label'    => 'ID 1',
        'priority' => 30,
    ),
    'id2' => array(
        'label'    => 'ID 2',
        'priority' => 70,
    ),
    'id3' => array(
        'label'    => 'ID 3',
        'priority' => 20,
    ),
    'id4' => array(
        'label'    => 'ID 4',
        'priority' => 30,
    ),
);

$sorted = multisortByKeyValue( 'priority', $arr );

// $sorted equals to:
/*
array (
  'id3' => array (
    'label' => 'ID 3',
    'priority' => 20,
  ),
  'id1' => array (
    'label' => 'ID 1',
    'priority' => 30,
  ),
  'id4' => array (
    'label' => 'ID 4',
    'priority' => 30,
  ),
  'id2' => array (
    'label' => 'ID 2',
    'priority' => 70,
  ),
)
*/