通过键的存在对多维数组进行排序

Question

我有阵列：

Array (
    [0] => Array (
        [var_for_type] => inside
        [show_about] => on
        [pagethumb] => on
        [postthumb] => on
        [portfoliothumb] => on
    )
    [1] => Array (
        [var_for_type] => shadow
        [show_about] => on
        [box_for_type] => Array ( [0] => cvb [1] => odf [2] => o-koshkah )
        [postthumb] => on
    )
)

我需要通过键＆＃39; box_for_type＆＃39;来存储它。如果键＆＃39; box_for_type＆＃39;存在，而不是在多维数组中的其他数组之前输出它。我该怎么办？

Answer 1

您需要使用usort()函数来定义自己的比较元素的函数：

 $sample = [
   ['test' => 'a'],
   ['test' => 'g', 'box_for_type' => []],   
   ['test' => 'b'],
   ['test' => 'c', 'box_for_type' => []],
 ];


usort($sample, function ($a, $b){
   return (int)!array_key_exists('box_for_type', $a); 
});

print_r($sample);