为了将来参考，您可以使用以下内容通过 XPath 查询节点并通过 XPath 对结果进行排序：SimpleDOM。<tree/>在此示例中，我按属性值对所有节点进行排序order：
include 'SimpleDOM.php';
$page = simpledom_load_string('<page>
<talentTrees>
<tree name="Football" order="2"/>
<tree name="Baseball" order="0"/>
<tree name="Frisbee" order="1"/>
</talentTrees>
</page>');
$nodes = $page->sortedXPath('//tree', '@order');
foreach ($nodes as $node)
{
echo $node->asXML(), "\n";
}
这应该给你你想要的：
$string = <<<EOS
<page>
<talentTrees>
<tree name="Football" order="2" />
<tree name="Baseball" order="0" />
<tree name="Frisbee" order="1" />
</talentTrees>
</page>
EOS;
$xml = simplexml_load_string($string);
$trees = $xml->xpath('/page/talentTrees/tree');
function sort_trees($t1, $t2) {
return strcmp($t1['order'], $t2['order']);
}
usort($trees, 'sort_trees');
var_dump($trees);
$trees现在按 order 属性排序。
我写了一个递归的扩展版本，它将按任意数量的属性排序，按顺序：
//sort_xml_by_attr($simplexmlobject,array('attr_one','attr_two','attr_three'))
class SortXML {
public $xml;
var $attr;
function SortXML($xml,$attr) {
$this->xml = $xml;
$this->attr = $attr;
}
function cmp_attr($a,$b) {
$a1 = (string)$a->xml[(string)$a->attr];
$b1 = (string)$b->xml[(string)$b->attr];
if (is_numeric($a1) && is_numeric($b1)) {
if (is_float($a1) && is_float($b1)) {
$a1 = (float)$a1;
$b1 = (float)$b1;
} else {
$a1 = (int)$a1;
$b1 = (int)$b1;
}
}
if ($a1 == $b1) return 0;
return ($a1 > $b1) ? +1 : -1;
}
}
function sort_xml_by_attr($xml_obj,$attr) {
if (count($attr)>1) {
// break up array by unique values of the first attribute in the list
$unique_attrs = array();
foreach ($xml_obj as $i) $unique_attrs[] = (string)$i[$attr[0]];
$unique_attrs = array_unique($unique_attrs);
sort($unique_attrs);
// create an array of arrays who share a unique attribute value
foreach ($unique_attrs as $i) {
foreach ($xml_obj as $p) {
if ($p[$attr[0]] == $i) $xml_arrays[$i][] = $p;
}
}
// remove first element to progress the recursion to the next attribute
array_shift($attr);
$new_array = array();
// concatenate sorted arrays
foreach ($xml_arrays as $i) {
$new_array = array_merge($new_array,sort_xml_by_attr($i,$attr));
}
return $new_array;
} else {
// create wrapper objects with new comparison function
foreach ($xml_obj as $i) $new_obj[] = new SortXML($i,$attr[0]);
usort($new_obj,array('SortXML','cmp_attr'));
foreach ($new_obj as $i) $sorted_obj[] = $i->xml;
return $sorted_obj;
}
}
如果你有很多这样的元素
$string = <<<EOS
<page>
<talentTrees>
<tree name="Football" order="2" />
<tree name="Baseball" order="0" />
<tree name="Frisbee" order="1" />
</talentTrees>
<talentTrees>
<tree name="Football2" order="1" />
<tree name="Baseball2" order="2" />
<tree name="Frisbee2" order="0" />
</talentTrees>
</page>
EOS;
您可以使用foreach：
$xml = simplexml_load_string($string);
function sort_trees($t1, $t2) {
return $t1['order'] - $t2['order'];
}
foreach($xml->talentTrees as $talentTrees){
foreach($talentTrees->tree as $tree){
$trees[]= $tree;
}
usort($trees, 'sort_trees');
print_r($trees);
unset($trees);
}
输出：
Array
(
[0] => Array
(
[0] => SimpleXMLElement Object
(
[@attributes] => Array
(
[name] => Baseball
[order] => 0
)
)
[1] => SimpleXMLElement Object
(
[@attributes] => Array
(
[name] => Frisbee
[order] => 1
)
)
[2] => SimpleXMLElement Object
(
[@attributes] => Array
(
[name] => Football
[order] => 2
)
)
)
[1] => Array
(
[0] => SimpleXMLElement Object
(
[@attributes] => Array
(
[name] => Frisbee2
[order] => 0
)
)
[1] => SimpleXMLElement Object
(
[@attributes] => Array
(
[name] => Football2
[order] => 1
)
)
[2] => SimpleXMLElement Object
(
[@attributes] => Array
(
[name] => Baseball2
[order] => 2
)
)
)
)
这个页面提供了一些很好的例子，我认为你可以使用
我得到了使用 PHP 中的属性进行 xml 排序的解决方案。
请访问以下网址：-
http://ewebsurf.blogspot.com/2010/12/xml-sorting-using-attributes-php.html