Question

可能重复：
php count xml elements

我有一个包含视频标题的XML文件

<videolist>
<video>
<title>Title1</title>
</video>

<video>
<title>Title2</title>
</video>
</videolist>

如何计算视频元素的数量？我通常使用simpleXML来读取XML文件。从上面的例子中，有几个视频元素。

Answer 1

$s = simplexml_import_dom($dom);
echo count($s -> video);

Answer 2

以下是使用SimpleXML对象的'video'属性的count（）示例。

我还包含了一个函数，用于将simpleXML对象转换为可以count（）的数组。

<?php

$xml = '
<videolist>
<video>
<title>Title1</title>
</video>

<video>
<title>Title2</title>
</video>
</videolist>
';

$sxe = new SimpleXMLElement($xml);

print count($sxe->video)."\n";

$array = simpleXMLToArray($sxe);

print count($array['video'])."\n";

function simpleXMLToArray($xml,
                        $flattenValues=true,
                        $flattenAttributes = true,
                        $flattenChildren=true,
                        $valueKey='@value',
                        $attributesKey='@attributes',
                        $childrenKey='@children'){

                $return = array();
                if(!($xml instanceof SimpleXMLElement)){return $return;}
                $name = $xml->getName();
                $_value = trim((string)$xml);
                if(strlen($_value)==0){$_value = null;};

                if($_value!==null){
                        if(!$flattenValues){$return[$valueKey] = $_value;}
                        else{$return = $_value;}
                }

                $children = array();
                $first = true;
                foreach($xml->children() as $elementName => $child){
                        $value = simpleXMLToArray($child, $flattenValues, $flattenAttributes, $flattenChildren, $valueKey, $attributesKey, $childrenKey);
                        if(isset($children[$elementName])){
                                if($first){
                                        $temp = $children[$elementName];
                                        unset($children[$elementName]);
                                        $children[$elementName][] = $temp;
                                        $first=false;
                                }
                                $children[$elementName][] = $value;
                        }
                        else{
                                $children[$elementName] = $value;
                        }
                }
                if(count($children)>0){
                        if(!$flattenChildren){$return[$childrenKey] = $children;}
                        else{$return = array_merge($return,$children);}
                }

                $attributes = array();
                foreach($xml->attributes() as $name=>$value){
                        $attributes[$name] = trim($value);
                }
                if(count($attributes)>0){
                        if(!$flattenAttributes){$return[$attributesKey] = $attributes;}
                        else{$return = array_merge($return, $attributes);}
                }

                return $return;
        }

Answer 3

您可以使用只输出一些文本的简单XSLT脚本。您可以查看PHP provides for XSLT

的各种功能

一个简单的脚本看起来像这样：

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="text" encoding="iso-8859-1" indent="no"/>
 <xsl:template match="/">
  <xsl:value-of select="count(/videolist/video)" />
 </xsl:template>
</xsl:stylesheet>

要加载它，您的脚本可能如下所示：

<?php

 $yourXMLData = '<videolist>...</videolist>';
 $XSLTScript = '<xsl:stylesheet ... ';

 // Load the XML source
 $xml = new DOMDocument;
 $xml->load($yourXMLData);

 $xsl = new DOMDocument;
 $xsl->load($XSLTScript);

 // Configure the transformer
 $proc = new XSLTProcessor;
 $proc->importStyleSheet($xsl); // attach the xsl rules

 echo $proc->transformToXML($xml);

?>

如何计算XML元素

3 个答案: