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public function test() {
    //该xml有2个根节点：user 和 other
    $xml = '<?xml version="1.0" encoding="utf-8"?><user><name>姓名</name><age>99</age><hobby>study</hobby><like>you guess</like></user><other>1</other>';
    $array = self::xmlToArray($xml);
    var_export($array);
    die;
}

//将xml转为array
public function xmlToArray($xml) {
    if (!$xml) {
        die('xml数据异常');
    }
    //禁止引用外部xml实体 防XXE注入
    libxml_disable_entity_loader(true);//禁止引用外部xml实体
    //将XML转为array
    $arrayData = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
    return $arrayData;
}

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Entity: line 1: parser error : Extra content at the end of the document

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//加一个根标签root，防止转换时由于根标签有多个报错：Extra content at the end of the document in file
$xml = '<?xml version="1.0" encoding="utf-8"?><root><user><name>姓名</name><age>99</age><hobby>study</hobby><like>you guess</like></user><other>1</other></root>';
$array = self::xmlToArray($xml);
var_export($array);
die;

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array ( 'user' => array ( 'name' => '姓名', 'age' => '99', 'hobby' => 'study', 'like' => 'you guess', ), 'other' => '1', )

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mkdir('文件地址', 0777, true);    //true：递归创建目录
chmod('文件地址', 0777);

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chmod -R 777 /var/www/web/public/2021.txt