PHP 按两个属性对对象数组进行排序

Question

我有一个数组

Array
(
[0] => stdClass Object
    (
        [tab_option_name_selector] => 2
        [fieldtype] => notes
        [order] => 12
    )

[1] => stdClass Object
    (
        [tab_option_name_selector] => 2
        [fieldtype] => notes
        [order] => 8
    )

[2] => stdClass Object
    (
        [tab_option_name_selector] => 1
        [order] => 2
        [fieldtype] => selectbox
    )

[3] => stdClass Object
    (
        [tab_option_name_selector] => 2
        [order] => 3
        [fieldtype] => selectbox
    )
)

我正在尝试让这个 usort 函数工作

function osort(&$array, $props) 
{ 
    if(!is_array($props)) 
        $props = array($props => true); 

    $me = usort($array, function($a, $b) use ($props) { 
        foreach($props as $prop => $ascending) 
        { 
            if($a->$prop != $b->$prop) 
            { 
                if($ascending) 
                    return $a->$prop > $b->$prop ? 1 : -1; 
                else 
                    return $b->$prop > $a->$prop ? 1 : -1; 
            } 
        } 
        return -1; //if all props equal        
    });    
    print_r($props);
    return ($me);
} 


$tab = osort($objectArray, "tab_option_name_selector", "order"); 

所以按选项卡排序然后排序。

$tab 是空的 - 知道我做错了什么吗？

Answer 1

为什么额外的间接级别让事情变得更加困惑？为什么不直接用 usort($objectArray, "sortObjects");usort使用 sortObjects($a,$b)执行任何比较器的功能的函数:根据输入返回负数/0/正数？

如果选项卡不同，则返回它们的比较，如果它们相同，则返回顺序比较；完毕。

$array = array(
    (object)array(
        'tab_option_name_selector' => 2,
        'fieldtype' => 'notes',
        'order' => 12
    ),
    (object)array(
        'tab_option_name_selector' => 2,
        'fieldtype' => 'notes',
        'order' => 8
    ),
    (object)array(
        'tab_option_name_selector' => 1,
        'order' => 2,
        'fieldtype' => 'selectbox'
    ),
    (object)array(
        'tab_option_name_selector' => 2,
        'order' => 3,
        'fieldtype' => 'selectbox'
    )
);

function compareTabAndOrder($a, $b) {
    // compare the tab option value
    $diff = $a->tab_option_name_selector - $b->tab_option_name_selector;
    // and return it. Unless it's zero, then compare order, instead.
    return ($diff !== 0) ? $diff : $a->order - $b->order;
}

usort($array, "compareTabAndOrder");
print_r($array);