php报错为“重定义“，与实际不符合

Question

php报错重定义

我的php代码运行报错：如下
Fatal error: Cannot redeclare NewConn() (previously declared in /usr/local/httpd/htdocs/yzmm/xzq/html/xzq/qbn/MysqlInterface/InitSqlConnect.php:20) in /usr/local/httpd/htdocs/yzmm/xzq/html/xzq/qbn/MysqlInterface/InitSqlConnect.php on line 18

但是感觉不是很准，下面是报错提示的文件内容，请帮忙确定一下是为什么报错，一个是声明一个是使用怎么会重定义呢？

<?php
    namespace QueryResultStructEnum {
        const InfoTypeResult = 0;                //InfoType表查询结果
        const NodeTypeResult = InfoTypeResult + 1; //NeType表查询结果，NeInstance表查询结果：int, string, int, int
    };

    namespace {        
    $con= NewConn();
    if($link->connect_error)
    {
        die("连接失败: ".$link->connect_error);
    }        
    else
    {

    }

    function NewConn()
    {
        $host = '127.0.0.1';
        $user = 'root';
        $password = '123456';
        $dbName='yzmm';
        $con= mysqli_connect($host,$user,$password);
        mysqli_select_db($con,$dbName);
        return $con;    
    }

    function CloseConn($con)
    {   
       $con->close();
    }
}
?>