在PHP中解析大XML

class MyHandler extends XMLReader {
    function __construct() {
        $this->xml("example.xml");
    }

    function parse() {
        while ($this->read()) {
            switch ($this->nodeType) {
                case XMLREADER::ELEMENT:
                    if ($this->name == 'tag') {
                        $this->expand();
                        $value = $this->readString();
                        // 处理标签内容
                    }
                    break;
            }
        }
    }
}

$handler = new MyHandler();
$handler->parse();