包含文件中的名称空间声明是否自动包含父文件的名称空间（PHP）？

// file1.php
<?php
    namespace parent_space;
    include \'file2.php\';
?>

// file2.php
<?php
    namespace child_space;
    // some code
?>

parent_space

file2.php

\\parent_space\\child_space\\

<?php
    namespace Food; //this is a top level namespace
    include \'file2.php\';

//file2.php
<?php
    namespace Tacos; //this is still a top level namespace

<?php

namespace Food\\Tacos;