如何计算XML元素

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。从上面的例子来看，有几个视频元素。

Answer 1

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

Answer 2

下面是count（）对SimpleXML对象的'video'属性的示例。

我还包括一个函数来将simpleXML对象转换为数组，您也可以计数（）。

<?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

您可以使用一个简单的XSLT脚本来输出一些文本。 您可以查看PHP provides for XSLT

一个简单的脚本将那种看起来像这样的各种功能：

<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> 

要装入此，你的脚本看起来是这样的：

<?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); 

?>