How to Sort a Multidimensional PHP Array by an Inner Array Field?

Sorting a Multidimensional Array by an Inner Array Field in PHP

In PHP, you can manipulate multidimensional arrays to organize data based on specific criteria. Consider an array that represents a database table, where each element is a row and contains an inner array of field names and values.

To sort this array by the "price" field of the inner arrays, follow these steps:

1. Extract the "price" Values: Use array_column function to extract the "price" field and store them in a separate array:

   $prices = array_column($yourArray, "price");

2. Sort the "price" Array: Use sort() function (with PHP 7 or earlier) or sort() function (with PHP 8 and later) to sort the "price" array in ascending order:

   sort($prices); // For PHP 7 or earlier
   // OR
   $prices = sort($prices); // For PHP 8 and later

3. Reorder the Outer Array: Use array_multisort() function to reorder the outer array based on the sorted "price" array. It takes a column array (prices), an order array (SORT_ASC), and the array to be sorted (yourArray):

   // For PHP 7 or earlier:
   array_multisort($prices, SORT_ASC, $yourArray);
   
   // For PHP 8 and later. No need for `$col` variable:
   array_multisort(array_column($yourArray, "price"), SORT_ASC, $yourArray);

By following these steps, you can efficiently sort a multidimensional array based on an inner array field in PHP, enabling you to organize data in a desired order.

The above is the detailed content of How to Sort a Multidimensional PHP Array by an Inner Array Field?. For more information, please follow other related articles on the PHP Chinese website!