按子节点PHP SimpleXML排序xml div [英] sort xml div by child node PHP SimpleXML
问题描述
所以我在xml文件中有一个<div>的列表.我正在使用php的simpleXML解析文件
so I have a list of <div>'s in an xml file. I'm parsing the file using php's simpleXML
我可以使用以下命令生成所有div的数组:
I can generate an array of all the divs with the following:
$divArray = $xmldoc->text->body->children();
但是现在我想通过div中的不同childNode(作者，标题，日期)对$ divArray进行排序.
But now I would like to order the $divArray by different childNodes (author, title, date) within the div.
div看起来像这样.
The div looks like this.
<div>
<bibl>
<author>
<title>
<date>
</bibl>
</div>
那我怎么拿$ divArray并按<author>或<title>或<date>对其排序?
So how can I take $divArray and sort it by <author> or <title> or <date>?
感谢您的帮助. jw
Thanks for your help. jw
推荐答案
基本过程是
- 将
SimpleXMLElement投射到数组中 - 编写一个接受两个
SimpleXMLElement自变量的比较函数 - 使用
usort()用比较功能对数组进行排序
- cast a
SimpleXMLElementinto an array - write a comparison function that accepts two
SimpleXMLElementarguments - sort the array with the comparison function using
usort()
我只能猜测您的原始XML结构，但我认为它看起来像这样:
I can only guess at your original XML structure, but I think it looks something like this:
$xml = <<<EOT
<root>
<text>
<body>
<div>
<bibl>
<author>A</author>
<title>A</title>
<date>1</date>
</bibl>
</div>
<div>
<bibl>
<author>B</author>
<title>B</title>
<date>2</date>
</bibl>
</div>
<div>
<bibl>
<author>D</author>
<title>D</title>
<date>4</date>
</bibl>
</div>
<div>
<bibl>
<author>C</author>
<title>C</title>
<date>3</date>
</bibl>
</div>
</body>
</text>
</root>
EOT;
$xmldoc = new SimpleXMLElement($xml);
第1步:转换为数组.请注意，您的 $divArray 实际上不是数组！
Step 1: Cast to array. Note that your $divArray is not actually an array!
$divSXE = $xmldoc->text->body->children(); // is a SimpleXMLElement, not an array!
// print_r($divSXE);
$divArray = array();
foreach($divSXE->div as $d) {
$divArray[] = $d;
}
// print_r($divArray);
第2步:编写比较功能.由于数组是SimpleXMLElement的列表，因此比较函数必须接受SimpleXMLElement自变量. SimpleXMLElement需要显式转换才能获取字符串或整数值.
Step 2: write a comparison function. Since the array is a list of SimpleXMLElements, the comparison function must accept SimpleXMLElement arguments. SimpleXMLElements need explicit casting to get string or integer values.
function author_cmp($a, $b) {
$va = (string) $a->bibl->author;
$vb = (string) $b->bibl->author;
if ($va===$vb) {
return 0;
}
return ($va<$vb) ? -1 : 1;
}
第3步:使用usort()
usort($divArray, 'author_cmp');
print_r($divArray);
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