namespaces - PHP namespaces Questions?

<code><?php

$obj = new \test\pay;

$obj = new test\pay;</code>

When writing in a php file without a namespace, both of the above methods are correct. Why is this happening?

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<code><?php

$obj = new \test\pay;

$obj = new test\pay;</code>

When writing in a php file without a namespace, both of the above methods are correct. Why is this happening?

If there is no prefix when using a namespace, PHP will search relative to the current namespace,
And if our current environment does not have a namespace, that is, it is under the root namespace, it will naturally be the same as the one with the prefix The usage method is consistent.

If no namespace is defined, the default is global