Two-dimensional array sorted by a key value for PHP

$arr =[    Array (        ' name ' = ' small Bad dragon ',        ' age ' =>28    ),    Array (        ' name ' = ' small bad Dragon 2 ',        ' age ' = >14    ),    Array (        ' name ' = ' small bad Dragon 3 ',        ' age ' =>59    ),    Array (        ' name ' = ' small bad Dragon 4 ',        ' age ' =>23    ,    Array (        ' name ' = ' = ' small bad Dragon 5 ',        ' age ' =>23    ),    array (        ' Name ' = ' ' small bad Dragon 6 ',        ' age ' =>21    ,]; Array_multisort (Array_column ($arr, ' age '), Sort_desc, $arr);p Rint_r ($arr);

　　

where Array_column (an array, a key value in an array) returns a one-dimensional array from a column that extracts a key value from a multidimensional array;

Array_multisort (Array (one-dimensional array), sort (SOTR_ASC,SOTR_DESC), other array (can be two-dimensional))

Two-dimensional array sorted by a key value for PHP