重新排序阵列属性然后再保存到PHP的XML [英] reordering array attributes then save back to XML in php

问题描述

我有这样的XML：

  <picture id="2">
    <title>B</title>
  </picture>
  <picture id="3">
    <title>C</title>
  </picture>
  <picture id="0">
    <title>A</title>
  </picture>

努力实现这一点：

Trying to achieve this:

  <picture id="1">
    <title>B</title>
  </picture>
  <picture id="2">
    <title>C</title>
  </picture>
  <picture id="0">
    <title>A</title>
  </picture>

使用该得到的id属性值的列表：

Using this to get a list of 'id' attribute values:

$objXML = new SimpleXMLElement(XML_FILE_NAME, null, true);
$picture = $objXML->xpath('picture');
$arrayCurrent = array();
foreach($picture as $value) {
    $arrayCurrent[] = (string)$value['id'];
}
sort($arrayCurrent); // put XML into numerical 'id' order
print_r($arrayCurrent);

它返回：阵列（[0] => 0 [1] => 2 [2] => 3）
任何想法如何重新建立索引像这样：0，1，2并保存相应的'ID'在XML文档属性回到正确的位置。

It returns: Array ( [0] => 0 [1] => 2 [2] => 3 ) Any ideas how to re-index like so: 0, 1, 2 and save the appropriate 'id' attributes back to their correct positions in the XML doc?

谢谢，安迪

推荐答案

数字ID为了保持并取得连续的：

Numerical id order is maintained and made consecutive:

$objXML = new SimpleXMLElement(XML_FILE_NAME, null, true);
$picture = $objXML->xpath('picture');
usort($picture, create_function('$a,$b', 'return (string)$a["id"] - (string)$b["id"];'));
foreach ($pictures as $index => $node) $node["id"] = $index;

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