PHP请求

Question

我在通过以下方式加载的XML文件中提供了一个票证列表：

$xml = simplexml_load_file($xmlFile);

票的记录中包含两个字段，如下所示：

<tickets>
  <ticket>
    <custom-fields>
      <custom-field type="List" name="public" id="1392571">Public</custom-field>
      <custom-field type="List" name="Typ" id="1150963">Change Request</custom-field>
    </custom-fields>
  </ticket>
  <ticket>
    <custom-fields>
      <custom-field type="List" name="public" id="1392571">Non-Public</custom-field>
      <custom-field type="List" name="Typ" id="1150963">Change Request</custom-field>
    </custom-fields>
  </ticket>
</tickets>

现在，我只想展示公共门票。但是我想展示一下这张票的类型。

所以我需要检查一下

如果第一个自定义字段具有属性“name=”“Public”和值“Public”

1. ，则显示来自具有属性name="Typ"

的同级字段的值。

我已经可以检查的第一部分是：

if($ticket->{'custom-fields'}[0]->{'custom-field'}[0]) == "PUBLIC"){
  //now populate the Value from the second field
}

问:我现在如何从兄弟姐妹中提取值？

或者更好。是否有可能得到具有特殊值的字段的值？我在XPATH中使用的Liek：

/tickets/ticket/custom-fields/custom-field[@name="public"]/../custom-field[@name="Typ"]

谢谢!

Answer 1

您完全可以使用XPath查询：'/tickets/ticket/custom-fields[custom-field="Public"]/custom-field[@name="Typ"]'来完成这一任务。

完整的例子：

$xmlString = '
<tickets>
  <ticket>
    <custom-fields>
      <custom-field type="List" name="public" id="1392571">Public</custom-field>
      <custom-field type="List" name="Typ" id="1150963">Change Request (public)</custom-field>
    </custom-fields>
  </ticket>
  <ticket>
    <custom-fields>
      <custom-field type="List" name="public" id="1392571">Non-Public</custom-field>
      <custom-field type="List" name="Typ" id="1150963">Change Request (non-public)</custom-field>
    </custom-fields>
  </ticket>
</tickets>';

$xmlDoc = new SimpleXMLElement($xmlString);

$output = $xmlDoc->xpath('/tickets/ticket/custom-fields[custom-field="Public"]/*[@name="public"]/../custom-field[@name="Typ"]');

给出

array(1) {
  [0]=>
  object(SimpleXMLElement)#2 (2) {
    ["@attributes"]=>
    array(3) {
      ["type"]=>
      string(4) "List"
      ["name"]=>
      string(3) "Typ"
      ["id"]=>
      string(7) "1150963"
    }
    [0]=>
    string(15) "Change Request (public)"
  }
}

在PHP7.2上测试