XMLWriter和XMLReader读写XML文件

XMLWriter写XML文件：

<?php
/**
* function：XMLWriter写XML文件
* author：JetWu
* date：2016.12.03
**/
$mysqli = mysqli_connect('localhost', 'root', '123456', 'wjt');
if(mysqli_connect_errno()) die('database connect fail:' . mysqli_connect_error());
 
$sql = 'select * from study order by starttime';
$res = mysqli_query($mysqli, $sql);
$study = array();
while($row = mysqli_fetch_array($res)) {
    $study[] = $row;
}
 
//XML标签配置
$xmlTag = array(
    'starttime',
    'endtime',
    'school'
);
 
$xml = new XMLWriter();
$xml->openUri('./write_WR.xml');
$xml->setIndentString('  ');//设置缩进格式化使用的符号
$xml->setIndent(true);
$xml->startDocument('1.0', 'utf8');
$xml->startElement('studentcareer');
foreach($study as $s) {
    $xml->startElement('period');
    foreach($xmlTag as $x) {
        $xml->startElement($x);
        $xml->text($s[$x]);
        $xml->endElement();
    }
    $xml->endElement();
}
$xml->endElement();
$xml->endDocument();
$xml->flush();

XMLReader读XML文件：

<?php
/**
* function：XMLReader读XML文件
* author：JetWu
* date：2016.12.03
**/
//XML标签配置
$xmlTag = array(
    'starttime',
    'endtime',
    'school'
);
$xml = new XMLReader();
$xml->open('./write_WR.xml');
$study = array();
$count = 0;//记录数：方便组装数据
$name = '';
while($xml->read()) {
    $n = $xml->name;
    if($xml->nodeType == XMLReader::ELEMENT) {
        if($n == 'period') {//开始下一条记录的读取
            $count ++;
        } else if(in_array($n, $xmlTag)) {//记录需要获取文本值的标签名
            $name = $n;
        }
    } else if($xml->nodeType == XMLReader::TEXT) {
        if(in_array($name, $xmlTag)) {
            $study[$count][$name] = $xml->value;
        }
    }
}
$xml->close();
echo '<pre>';
print_r($study);