php生成xml文件的3种方法效率比较

private function directWriteXml(&$data){$xmltext='';$xmltext .='';$xmltext .='';$loop=count($data);foreach ($data as $d){$xmltext .="";}$xmltext .='';$xmltext .='';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 = simplexml_load_string($string);foreach ($data as $d) {$xml->addChild('Row'," ID=\" {$d['id']} \" Name=\" {$d['name']}\" " );}return $xml->asXML(); ;}?>复制代码调用时每个都加上大数循环操作,并记录时间。$loop=10000;$xml='';switch($_GET['id']){case 1:$ts=$this->microtime_float();for( $i=0; $i$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; $i$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; $i$xml=$this->useSimpleXML($depdata);$te=$this->microtime_float();$t=$te-$ts;$this->assign('times',$t);$this->assign('method','SimpleXML');break;}echo $xml;?>复制代码实测结果：直接写最快，耗时只有其他方式的1/3左右。而其他2种方法差不多，相比之下simplexml要快一些。