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

The sorting of a two-dimensional array in php can be implemented by multiple methods. For example, the following two-dimensional array is implemented by sorting the 'age' key value.

Two-dimensional array:

$arr=[ array( 'name'=>'A', 'age'=>28 ), array( 'name'=>'B', 'age'=>14 ), array( 'name'=>'C', 'age'=>59 ), array( 'name'=>'D', 'age'=>23 ), array( 'name'=>'E', 'age'=>23 ), array( 'name'=>'F', 'age'=>21 ), ];

Sort by 'age' key value:

array_multisort(array_column($arr,'age'),SORT_DESC,$arr); printr($arr);

Among them array_column (array, A key value in the array) is a column that represents a key value taken 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 (which can be two-dimensional) can be used to sort multiple arrays at once, or to sort multi-dimensional arrays according to one or more dimensions.

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