use / PDO;
and
use PDO;
?
I think use / PDO; is a PDO class introduced in the root space, so why can use PDO; be introduced successfully?
use / PDO;
and
use PDO;
?
I think use / PDO; is a PDO class introduced in the root space, so why can use PDO; be introduced successfully?
Note that for names in namespaces (fully qualified names that contain namespace delimiters such as FooBar and relatively global names such as FooBar that do not contain namespace delimiters), the leading backslash of is unnecessary and not recommended, because imported names must be fully qualified and will not be relatively resolved based on the current namespace.
Please take a closer look at the official document
use Namespace: alias / Import
<?php
namespace foo;
// "use \ArrayObject" foo\ArrayObject
$a = new ArrayObject(array(1)); // foo\ArrayObject
// \ArrayObject "use \ArrayObject"
$a = new \ArrayObject(array(1)); // \ArrayObject
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