php生成xml文件的3种方法效率比较

<?php
private function directWriteXml(&$data){
$xmltext='<?xml version="1.0" encoding="UTF-8" ?>';
$xmltext .='<DocumentData>';
$xmltext .='<Detail>';
$loop=count($data);
foreach ($data as $d){
$xmltext .=" <Row ID=\" {$d['id']} \" Name=\" {$d['name']}\" />";
}
$xmltext .='</Detail>';
$xmltext .='</DocumentData>';
return $xmltext;
}
private function useDomDocument(&$data){
// 创建一个XML文档并设置XML版本和编码。。
$dom=new DomDocument('1.0', 'utf-8');
// 创建根节点
$detail01 = $dom->createElement('Detail');
$dom->appendchild($detail01);
foreach ($data as $d) {
$row = $dom->createElement('Row'," ID=\" {$d['id']} \" Name=\" {$d['name']}\" " );
$detail01->appendchild($row);
}
return $dom->saveXML();
}
private function useSimpleXML(&$data){
// 创建一个XML文档并设置XML版本和编码。。
$string = <<<XML
<?xml version='1.0' encoding='utf-8'?>
<detail01>
</detail01>
XML;
$xml = simplexml_load_string($string);
foreach ($data as $d) {
$xml->addChild('Row'," ID=\" {$d['id']} \" Name=\" {$d['name']}\" " );
}
return $xml->asXML(); ;
}
?>

<?php
$loop=10000;
$xml='';
switch($_GET['id']){
case 1:
$ts=$this->microtime_float();
for( $i=0; $i<$loop; $i++)
$xml=$this->directWriteXml($depdata);
$te=$this->microtime_float();
$t=$te-$ts;
$this->assign('times',$t);
$this->assign('method','直接写');
break;
case 2:
$ts=$this->microtime_float();
for( $i=0; $i<$loop; $i++)
$xml=$this->useDomDocument($depdata);
$te=$this->microtime_float();
$t=$te-$ts;
$this->assign('times',$t);
$this->assign('method','DomDocument');
break;
case 3:
$ts=$this->microtime_float();
for( $i=0; $i<$loop; $i++)
$xml=$this->useSimpleXML($depdata);
$te=$this->microtime_float();
$t=$te-$ts;
$this->assign('times',$t);
$this->assign('method','SimpleXML');
break;
}
echo $xml;
?>