在 PHP cURL 中输出数组的 For 循环

For loop for outputting array in PHP cURL

我XML喜欢

<user>
 <researcher>
  <researcher_keywords>
    <researcher_keyword>
        <value>Value A</value>
    </researcher_keyword>
    <researcher_keyword>
        <value>Value B</value>
    </researcher_keyword>
    <researcher_keyword>
        <value>Value C</value>
    </researcher_keyword>
   </researcher_keywords>
 </researcher>
</user>

...我希望能够使用 foreach 循环或类似的由竖线字符分隔的循环输出所有 <researcher_keyword> 值 |

我可以使用如下代码访问特定值:$oXML->researcher->researcher_keywords->researcher_keyword[0]->value ?? null;

...但是如何使用循环输出数组中的内容?

我认为这样的事情会奏效,但运气不好:

 $oXML2 = new SimpleXMLElement( $response2 );
...
 foreach($oXML2->researcher_keyword as $researcher_keyword){
    echo (string)$researcher_keyword['value'];
 }

var_dump($oXML2->researcher->researcher_keywords); 输出:

object(SimpleXMLElement)#19 (1) { ["researcher_keyword"]=> array(7) { [0]=> object(SimpleXMLElement)#18 (1) { ["value"]=> string(19) "Ancient Mesopotamia" } [1]=> object(SimpleXMLElement)#20 (1) { ["value"]=> string(30) "Ancient Near Eastern religions" } [2]=> object(SimpleXMLElement)#16 (1) { ["value"]=> string(12) "Hebrew Bible" } [3]=> object(SimpleXMLElement)#21 (1) { ["value"]=> string(21) "American religion" } [4]=> object(SimpleXMLElement)#22 (1) { ["value"]=> string(18) "American magic" } [5]=> object(SimpleXMLElement)#23 (1) { ["value"]=> string(23) "American literature" } [6]=> object(SimpleXMLElement)#24 (1) { ["value"]=> string(20) "American thought" } } } 

假设关键字永远不会超过 10 个,我可以使用下面的代码,但这并不理想。

  $j = 10;
  for($i = 0; $i < $j ; $i++) {
    $keyword_r = $oXML2->researcher->researcher_keywords->researcher_keyword[$i]->value ?? null;
      echo $keyword_r . "<br>";
  }

谢谢

使用此代码:

$s = '<user>
 <researcher>
  <researcher_keywords>
    <researcher_keyword>
        <value>Value A</value>
    </researcher_keyword>
    <researcher_keyword>
        <value>Value B</value>
    </researcher_keyword>
    <researcher_keyword>
        <value>Value C</value>
    </researcher_keyword>
   </researcher_keywords>
 </researcher>
</user>';

$oXML2 = new SimpleXMLElement( $s );
foreach($oXML2->researcher->researcher_keywords->researcher_keyword as $word){
    echo $word->value . '<br />';
}