PHP 输出 SimpleXMLElement

Question

我正在尝试读取 .php 中的 SimpleXMLElement 以补充搜索功能。我通过请求从一个名为 openthesaurus.de 的德语同义词 API 获取 XML file_get_contents。然后，我将收到的元素转换为 SimpleXMLElement 并尝试读取每个元素的属性term。（我知道下面的代码只关注synset['0']）。这样做是为了保持简单。

我的 .php 看起来像这样

            $url = "https://www.openthesaurus.de/synonyme/search?q=". $keyword. "&format=text/xml";

            $options = array('http' =>

                array(

                    'method'  => 'POST',

                    'header'  => 'user_agent: my-site.xyz',

                )

            );

            $context = stream_context_create($options);

            $recive = file_get_contents($url, false, $context);

            if (($recieve = file_get_contents($url))===false){

                echo "Error fetching XML\n";

            } else {

                libxml_use_internal_errors(true);

                $syn = new SimpleXMLElement($recieve);

                if (!$syn) {

                   echo "Error loading XML\n";

                    foreach(libxml_get_errors() as $error) {

                        echo "\t", $error->message;

                    }

                } else {

                    echo "content: <br>";

                    foreach($syn->synset[0]->term as $value){

                        echo $value. "<br>";

                    }

                }

            }

xml 看起来像这样：

<matches>

    <metaData>

        <apiVersion content="0.1.3"/>

        <warning content="WARNING -- this XML format may be extended without warning"/>

        <copyright content="Copyright (C) 2019 Daniel Naber (www.danielnaber.de)"/>

        <license content="Creative Commons Attribution-ShareAlike 4.0 or GNU LESSER GENERAL PUBLIC LICENSE Version 2.1"/>

        <source content="https://www.openthesaurus.de"/>

        <date content="Sat Jun 27 09:48:33 CEST 2020"/>

    </metaData>

不幸的是，除了中断之外，.php 没有输出任何内容。我也尝试过通过 print_r 输出，但这也没有帮助。但是 if 条件表明empty($value)该条件$value不为空。

Answer 1

SimpleXMLElement我和这个家庭的任何人都不熟悉SimpleXML，但如果你改变以下内容foreach($syn->synset[0]->term as $value){&nbsp; &nbsp; echo $value. "<br>";}到foreach( $syn->synset as $obj ){&nbsp; &nbsp; foreach( $obj->term as $arr ){&nbsp; &nbsp; &nbsp; &nbsp; foreach( $arr->attributes() as $attr => $value ) echo $attr . ' ' . $value .'<br />';&nbsp; &nbsp; }}或者，更全面地说：<?php&nbsp; &nbsp; $keyword='kopf'; # for example...&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; $url = "https://www.openthesaurus.de/synonyme/search?q=". $keyword. "&format=text/xml";&nbsp; &nbsp; $options = array('http' =>&nbsp; &nbsp; &nbsp; &nbsp; array(&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 'method'&nbsp; => 'POST',&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 'header'&nbsp; => 'user_agent: my-site.xyz',&nbsp; &nbsp; &nbsp; &nbsp; )&nbsp; &nbsp; );&nbsp; &nbsp; $context = stream_context_create( $options );&nbsp; &nbsp; $recive = file_get_contents( $url, false, $context );&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; if( ( $recieve = file_get_contents( $url ) )===false ){&nbsp; &nbsp; &nbsp; &nbsp; echo "Error fetching XML\n";&nbsp; &nbsp; } else {&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; libxml_use_internal_errors(true);&nbsp; &nbsp; &nbsp; &nbsp; $syn = new SimpleXMLElement( $recieve );&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; if (!$syn) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; echo "Error loading XML\n";&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; foreach(libxml_get_errors() as $error) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; echo "\t", $error->message;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; } else {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; foreach( $syn->synset as $obj ){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; foreach( $obj->term as $arr ){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; foreach( $arr->attributes() as $attr => $value ) echo $attr . ' ' . $value .'<br />';&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }?>您应该得到一些更有意义的输出，例如：term Hauptterm Kopfterm Caputlevel fachsprachlichterm Ballonlevel umgangssprachlichterm Birnelevel umgangssprachlichterm Denkapparatlevel umgangssprachlichterm Denkzentrumlevel umgangssprachlichterm Dezlevel umgangssprachlichterm Kopplevel umgangssprachlichterm Murmellevel umgangssprachlichterm Nischellevel umgangssprachlichterm Nusslevel umgangssprachlichterm Ommelevel umgangssprachlichterm Rübelevel umgangssprachlichterm Schädellevel umgangssprachlichterm Anführerterm Führerterm Häuptlingterm Hauptmannterm (führender) Kopfterm Leiterterm Oberhauptterm Capo (einer Ultra-Gruppe)level fachsprachlichterm Cheflevel umgangssprachlich