How to sort array in PHP using one of the field [d

问题:

This question already has answers here:

Sorting a multidimensional array in PHP? [duplicate] (3 answers)

Closed 7 years ago.

I'm trying to sort the array in PHP. Please see my array:

Array
(
    [0] => Array
        (
            [id] => 8
            [date_start_month_name] => January
            [approved] => Accepted: yes
        )

    [1] => Array
        (
            [id] => 3
            [date_start_month_name] => January
            [approved] => Accepted: yes
        )

    [2] => Array
        (
            [id] => 2
            [date_start_month_name] => March
            [approved] => Accepted: yes
        )

    [3] => Array
        (
            [id] => 5
            [date_start_month_name] => April
            [approved] => Accepted: yes
        )

)

I want to sort the array using month name, for example: January and get something like this:

Array
(
    [0] => Array
        (
            [id] => 8
            [date_start_month_name] => January
            [approved] => Accepted: yes
        )

    [1] => Array
        (
            [id] => 3
            [date_start_month_name] => January
            [approved] => Accepted: yes
        )
)

How can I do that? Thanks in advance for any help. Best!

回答1:

You can use the usort function to acheive this like so:

<?php
     // Sort the multidimensional array
     usort($results, "custom_sort");
     // Define the custom sort function
     function custom_sort($a,$b) {
          return $a['some_sub_var']>$b['some_sub_var'];
     }
?>

回答2:

use usort

usort($array, function($a, $b) {
    return $a['date_start_month_name'] > $b['date_start_month_name']
});