PHP multi-dimensional arrays are sorted by the values of one field, and php multi-dimensional arrays are sorted.

PHP multi-dimensional arrays are sorted by the values of one field, and php multi-dimensional arrays are sorted.

In normal times, simple one-dimensional arrays or simple array sorting are not described here. This is mainly used to sort projects based on one of the multi-dimensional arrays.
The php function used is: array_multisort.

Train of Thought: Get the fields you need to sort as one-dimensional array arr1, which will be used later to sort multi-dimensional array data.
Here we mainly use two-dimensional arrays as an example. Multi-dimensional arrays also share the same idea.

$ Data = array (
Array ('price' => '123', 'Count' => '40', 'level' => '1 '),
Array ('price' => '000000', 'Count' => '30', 'level' => '2 '),
Array ('price' => '123', 'Count' => '20', 'level' => '3 '),
Array ('price' => '123', 'Count' => '10', 'level' => '4 '),
);

For example, to reverse the price, we need to obtain the value of the price field as a new one-dimensional array.

$ Arr1 = array_map (create_function ('$ n', 'Return $ n ["price"];'), $ data );

If the php version is later than 5.5, you can directly use the Array Operation Method array_column to directly obtain a field. Here you can also use foreach to obtain the field, but try to use built-in functions for processing.

Then array_multisort is used for processing,

Array_multisort ($ arr1, SORT_DESC, $ data); // sorts multidimensional arrays.

We can print the final result of $ data to see the result: