php simplexml - 字符串作为对象

发布于 2024-10-01 01:33:34 字数 342 浏览 2 评论 0原文

希望有人能就我遇到的 simplexml 问题提出建议。

我需要指定各个节点的路径，但我不确定这是否可行。

$xml = new SimpleXMLElement($xmlstr);
$image1 = 'images->image[0]->image';

foreach ($xml->record as $record) {
  echo $record->$image1; // i need this be be recognised as $record->images->image[0]->image
}

希望这是有道理的！谢谢

原文

Hoping somebody can advise on an issue I have with simplexml.

I need to specify the paths for various nodes but I'm not sure if this is possible.

$xml = new SimpleXMLElement($xmlstr);
$image1 = 'images->image[0]->image';

foreach ($xml->record as $record) {
  echo $record->$image1; // i need this be be recognised as $record->images->image[0]->image
}

Hope this makes sense! Thanks

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谁的新欢旧爱 2024-10-08 01:33:34

您可以为此使用数组：

$xml = new SimpleXMLElement($xmlstr);
$levels = array('images', array('key' => 'image', 'index' => 0), 'image');

foreach ($xml->record as $record) {
   $obj = $record;
   foreach($levels as $level) {
      if(is_array($level)) 
         $obj = $obj->{$level['key']}[$level['index']];
      else 
         $obj = $obj->$level; 
   }
   echo $obj;
}

这通过重新分配 $obj 等于其自身 -> 来构建层次结构，无论数组中的下一个是什么。

PHP 无法在字符串中插入数组索引，因此如果需要使用它们，只需使用如上所示的关联数组即可。 :-)

You can use an array for this:

$xml = new SimpleXMLElement($xmlstr);
$levels = array('images', array('key' => 'image', 'index' => 0), 'image');

foreach ($xml->record as $record) {
   $obj = $record;
   foreach($levels as $level) {
      if(is_array($level)) 
         $obj = $obj->{$level['key']}[$level['index']];
      else 
         $obj = $obj->$level; 
   }
   echo $obj;
}

This builds up the hierarchy by reassigning $obj equal to itself -> whatever is next in the array.

PHP cannot interpolate array indices in strings, so if you need to use them, just use an associate array as shown above. :-)

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