在php中按值排序json数组 - sorting json array by value in php

sorting json array by value in php

本文关键字：排序 json 数组 php | 更新日期: 2023-09-27

我有一个json数组，如下所示，我想按大小对它进行排序

Array
(
    [0] => {"file_name":"Desert - Copy.jpg","content_type":"image'/jpeg","tmp_path":"'/var'/www'/mywebsite.com'/public_html'/www'/tmp'/0000000012","sha256":"010f60d2927a35d0235490136ef9f4953b7ee453073794bcaf153d20a64544ea","size":"845941"}
    [1] => {"file_name":"Hydrangeas - Copy.jpg","content_type":"image'/jpeg","tmp_path":"'/var'/www'/mywebsite.com'/public_html'/www'/tmp'/0000000013","sha256":"3b92fede080f9b0ec902afc58831191b5b8ccbaf6732352fd7a8b445d1e9f0bd","size":"595284"}
    [2] => {"file_name":"Tulips.jpg","content_type":"image'/jpeg","tmp_path":"'/var'/www'/mywebsite.com'/public_html'/www'/tmp'/0000000014","sha256":"b9352f2565260219db72fc1fc896113a26c85866b69c50d3970c4d9f5cce830a","size":"620888"}
)

结果预期:

Array
(
    [0] => {"file_name":"Hydrangeas - Copy.jpg","content_type":"image'/jpeg","tmp_path":"'/var'/www'/mywebsite.com'/public_html'/www'/tmp'/0000000013","sha256":"3b92fede080f9b0ec902afc58831191b5b8ccbaf6732352fd7a8b445d1e9f0bd","size":"595284"}
    [1] => {"file_name":"Tulips.jpg","content_type":"image'/jpeg","tmp_path":"'/var'/www'/mywebsite.com'/public_html'/www'/tmp'/0000000014","sha256":"b9352f2565260219db72fc1fc896113a26c85866b69c50d3970c4d9f5cce830a","size":"620888"}
    [2] => {"file_name":"Desert - Copy.jpg","content_type":"image'/jpeg","tmp_path":"'/var'/www'/mywebsite.com'/public_html'/www'/tmp'/0000000012","sha256":"010f60d2927a35d0235490136ef9f4953b7ee453073794bcaf153d20a64544ea","size":"845941"}
)

如何高效地完成这个任务

<?php
 function sortByYear($a, $b) {
 $dA = new DateTime($a['date']);
 $dB = new DateTime($b['date']);
return $dA->format('y') - $dB->format('y');
 }
$data = '{"info":[{"id":1, "title":"original title", "name":"john doe", "date":"2010-05-15"}, {"id":2, "title":"another title", "name":"foo bar", "date":"2009-04-11"}]}';
$d = json_decode($data, true);
$info = $d['info'];
usort($info, 'sortByYear');
print_r($info);
?>

来源: http://codepad.org/6N4fmbKG

如何用PHP对JSON数组进行排序

这是我想到的，但我欢迎更有效的解决方案

function sort_json($json_array)
    {
        if (count($json_array) > 1) {
            //convert to array
            foreach ($json_array as &$json) {
                $array[] = json_decode($json);
            }
            // sort in ascending order by size
            usort($array, function($a, $b)
            {
                return $a->size < $b->size ? -1 : 1; //Compare the sizes
            });
            //convert back to json
            $json_array = array();
            foreach ($array as &$a) {
                $json_array[] = json_encode($a);
            }
        }
        return $json_array;
    }

使用以下代码:

function sortBySize($a, $b)
    {
        if ($a['size'] == $b['size']) return 0;
        return ($a['size'] < $b['size']) ? -1 : 1;
    }
usort($data, "sortBySize");

如何使用工作k: http://www.w3schools.com/php/func_array_usort.asp