Are traits in PHP affected by namespaces?
Solution 1
Yes, they are.
Import the trait with use
outside the class for PSR-4 autoloading.
Then use
the trait name inside the class.
namespace Example\Controllers;
use Example\Traits\MyTrait;
class Example {
use MyTrait;
// Do something
}
Or just use
the Trait with full namespace:
namespace Example\Controllers;
class Example {
use \Example\Traits\MyTrait;
// Do something
}
Solution 2
I think they are affected as well. Look at some of the comments on the php.net page.
The first comment:
Note that the "use" operator for traits (inside a class) and the "use" operator for namespaces (outside the class) resolve names differently. "use" for namespaces always sees its arguments as absolute (starting at the global namespace):
<?php
namespace Foo\Bar;
use Foo\Test; // means \Foo\Test - the initial \ is optional
?>
On the other hand, "use" for traits respects the current namespace:
<?php
namespace Foo\Bar;
class SomeClass {
use Foo\Test; // means \Foo\Bar\Foo\Test
}
?>
Solution 3
In my experience if this piece of code you pasted resides in different files/folders and you use the spl_autoload_register function to load classes you need to do it like this:
//file is in FOO/FooFoo.php
namespace FOO;
trait fooFoo {}
//file is in BAR/baz.php
namespace BAR;
class baz
{
use \FOO\fooFoo; // note the backslash at the beginning, use must be in the class itself
}
Solution 4
The documentation also says "A Trait is similar to a class", A trait is a special case of a class. So what applied to a class also applied to a trait.
learning php
Updated on July 19, 2022Comments
-
learning php almost 2 years
From the PHP documentation:
only four types of code are affected by namespaces: classes, interfaces, functions and constants.
But, it seems to me that TRAITS are also affected:
namespace FOO; trait fooFoo {} namespace BAR; class baz { use fooFoo; // Fatal error: Trait 'BAR\fooFoo' not found in }
Am I wrong?