SimpleXML/PHP - 无法访问对象 [英] SimpleXML/PHP - Can't access object

问题描述

$tmp2 = '<?xml version="1.0"?><RWResponse><RESPONSE><DATA><HEADER><COLUMN>interval</COLUMN><COLUMN>name</COLUMN></HEADER></DATA></RESPONSE></RWResponse>';
$xml = simplexml_load_string($tmp2);
echo $xml->RESPONSE->DATA->HEADER->COLUMN[0];

即使 var_dump 成功，上面也不会输出任何内容:

The above won't output anything, even though a var_dump is sucessful:

object(SimpleXMLElement)#2 (1) {
  ["RESPONSE"]=>
  object(SimpleXMLElement)#3 (1) {
    ["DATA"]=>
    object(SimpleXMLElement)#4 (1) {
      ["HEADER"]=>
      object(SimpleXMLElement)#5 (1) {
        ["COLUMN"]=>
        array(2) {
          [0]=>
          string(8) "interval"
          [1]=>
          string(13) "creative_name"
        }
      }
    }
  }
}

谢谢

推荐答案

这是因为 SimpleXML 需要精确的类型转换，否则你会遇到像这样的荒谬的事情 - var_dump 会输出你想要的东西，echo 不会.你总是需要这样做，还有更糟糕的错误，比如 echo ceil($simplexml->someNumber) 将输出 7 如果数字是例如 7.85 等等.
试试:

This is because SimpleXML requires exact typecasting or you'll get riddiculous things happening like this - var_dump will output what you want, echo won't. You always need to do this, there are even worse bugs, like echo ceil($simplexml->someNumber) will output 7 if the number is for example 7.85 and so on.
Try instead:

echo (string)$xml->RESPONSE->DATA->HEADER->COLUMN[0];

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