如何提取嵌套在json文件中的Array

Question

我有一些问题，数组结果是JSON。这是我的json文件，我想为每个对象提取所有“extlinks”结果Arrays。任何服务？这是维基百科API json。

Array
(
[continue] => Array
    (
        [eloffset] => 10
        [continue] => ||
    )

[query] => Array
    (
        [normalized] => Array
            (
                [0] => Array
                    (
                        [from] => rome
                        [to] => Rome
                    )

            )

        [pages] => Array
            (
                [25458] => Array
                    (
                        [pageid] => 25458
                        [ns] => 0
                        [title] => Rome
                        [extlinks] => Array
                            (
                                [0] => Array
                                    (
                                        [*] => //dx.doi.org/10.1017%2FS0009840X00221331
                                    )

                                [1] => Array
                                    (
                                        [*] => //dx.doi.org/10.2307%2F295257
                                    )

                                [2] => Array
                                    (
                                        [*] => //tools.wmflabs.org/geohack/geohack.php?pagename=Rome¶ms=41_54_N_12_30_E_type:city_region:IT
                                    )

                                [3] => Array
                                    (
                                        [*] => //web.archive.org/web/20071210175055/http://english.seoul.go.kr/gover/cooper/coo_02sis.html
                                    )

                                [4] => Array
                                    (
                                        [*] => //web.archive.org/web/20080204030918/http://www.romaperkyoto.org/index.php?option=com_content&task=view&id=35&Itemid=52
                                    )

                                [5] => Array
                                    (
                                        [*] => //web.archive.org/web/20080508191341/http://www.commune-tunis.gov.tn/fr/mairie_cooperation1.htm
                                    )

                                [6] => Array
                                    (
                                        [*] => //web.archive.org/web/20080530094628/http://www.trincoll.edu/depts/rome/curriculum/rome350.html
                                    )

                                [7] => Array
                                    (
                                        [*] => //web.archive.org/web/20080613192334/http://www.mpg.de/english/aboutTheSociety/aboutUs/scientificAwards/awardsOfMPS/hannoIlseHahnPrize/index.html
                                    )

                                [8] => Array
                                    (
                                        [*] => //web.archive.org/web/20080708234610/http://www.isvroma.it/public/EN/index.php?option=com_content&task=view&id=13&Itemid=+
                                    )

                                [9] => Array
                                    (
                                        [*] => //web.archive.org/web/20130702010825/http://www.krakow.pl/otwarty_na_swiat/2531,kat,0,5,miasta_partnerskie.html
                                    )

                            )

                    )

            )

    )

）

我的PHP代码是：

    $str=file_get_contents($url);
    $json = json_decode($str, true);

我如何回应所有的extlinks数组？

Answer 1

你可以这样做：

<?php

$url = "https://en.wikipedia.org/w/api.php?action=query&titles=rome&prop=extlinks&format=json";

$str=file_get_contents($url);
$json = json_decode($str, true);

$linksArray = [];

// current() takes an array and returns the current value (first in this case)
foreach (current($json['query']['pages'])['extlinks'] as $extlink){

  $pos = strpos($extlink['*'], 'http');

  if($pos == false){
    $linksArray[] = $extlink['*'];
  }
  else{
    $linksArray[] = substr($extlink['*'], 0, $pos);
    $linksArray[] = substr($extlink['*'], $pos);
  }

}

echo "<pre>";
print_r($linksArray);
echo "</pre>";

这是输出：

Array
(
    [0] => //dx.doi.org/10.1017%2FS0009840X00221331
    [1] => //dx.doi.org/10.2307%2F295257
    [2] => //tools.wmflabs.org/geohack/geohack.php?pagename=Rome¶ms=41_54_N_12_30_E_type:city_region:IT
    [3] => //web.archive.org/web/20071210175055/
    [4] => http://english.seoul.go.kr/gover/cooper/coo_02sis.html
    [5] => //web.archive.org/web/20080204030918/
    [6] => http://www.romaperkyoto.org/index.php?option=com_content&task=view&id=35&Itemid=52
    [7] => //web.archive.org/web/20080508191341/
    [8] => http://www.commune-tunis.gov.tn/fr/mairie_cooperation1.htm
    [9] => //web.archive.org/web/20080530094628/
    [10] => http://www.trincoll.edu/depts/rome/curriculum/rome350.html
    [11] => //web.archive.org/web/20080613192334/
    [12] => http://www.mpg.de/english/aboutTheSociety/aboutUs/scientificAwards/awardsOfMPS/hannoIlseHahnPrize/index.html
    [13] => //web.archive.org/web/20080708234610/
    [14] => http://www.isvroma.it/public/EN/index.php?option=com_content&task=view&id=13&Itemid=+
    [15] => //web.archive.org/web/20130702010825/
    [16] => http://www.krakow.pl/otwarty_na_swiat/2531,kat,0,5,miasta_partnerskie.html
)