按键的存在对多维数组进行排序 - Sort multidimensional array by existence of key

Sort multidimensional array by existence of key

本文关键字：数组排序存在 | 更新日期: 2023-09-27

我有数组：

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
    )
)

我需要根据关键字"box_for_type"的存在对其进行排序。如果键"box_for_type"存在，则在多维数组中的其他数组之前输出它。我该怎么做？

您需要使用usort（）函数，在这里您可以定义自己的函数来比较元素：

 $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);