How to sort a two-dimensional array by a certain key value in PHP

In practical applications, sometimes we encounter the need for specific sorting of two-dimensional arrays. How should we deal with this? Let’s take a look at the article’s examples!

$arr=[
    array(
        'name'=>'小坏龙',
        'age'=>28
    ),
    array(
        'name'=>'小坏龙2',
        'age'=>14
    ),
    array(
        'name'=>'小坏龙3',
        'age'=>59
    ),
    array(
        'name'=>'小坏龙4',
        'age'=>23
    ),
    array(
        'name'=>'小坏龙5',
        'age'=>23
    ),
    array(
        'name'=>'小坏龙6',
        'age'=>21
    ),
];
  
array_multisort(array_column($arr,'age'),SORT_DESC,$arr);
print_r($arr);

where array_column (array, a key value in the array) takes out a column of a key value from a multi-dimensional array and returns a one-dimensional array;

array_multisort (Array (one-dimensional array), sorting method (SOTR_ASC, SOTR_DESC), other arrays (can be two-dimensional))

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