Can CodeIgniter use namespaces?

There seems to be no namespace section in the CodeIgniter document.
PS: How to use libraries loaded by composer in CodeIgniter.

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There seems to be no namespace section in the CodeIgniter document.
PS: How to use libraries loaded by composer in CodeIgniter.

CI3 begins to support namespaces.
If you want to use Composer you can change $config['composer_autoload'] = TRUE in the config/config.php file;this option can be changed to TRUE, the default is FALSE

Pay attention here. If you change it to TRUE, then CI will automatically load application/vendor/autoload.phpSo, if your vendor directory is in the root directory of your project, that is, at the same level as index.php, then you You can use $config['composer_autoload'] = realpath(APPPATH . '../vendor/autoload.php'); to introduce Composer

No namespace means that the CI framework cannot use the namespace.
But you can use your own code.
If you want to use composer, you can add

where you want to use the composer library

<code>require __DIR__.'/vendor/autoload.php';
...</code>

Remember to adjust the path yourself

PHP versions greater than 5.3 support namespaces, which has nothing to do with the framework.
You only need to use the usekeyword

before the class definition.

//use 你的composer包的完全限定名

use Monolog\Logger;
use Monolog\Handler\StreamHandler;

class TestController {
    
}