What are some common pitfalls to avoid when using namespaces in PHP?

One common pitfall to avoid when using namespaces in PHP is forgetting to properly import classes or functions from other namespaces. This can lead to errors when trying to use those classes or functions in your code. To solve this issue, make sure to use the `use` keyword to import the necessary classes or functions at the beginning of your file.

// Incorrect way: forgetting to import the necessary class
namespace MyNamespace;

// Trying to use a class from another namespace without importing it
$otherClass = new OtherNamespace\OtherClass();

// Correct way: importing the necessary class
namespace MyNamespace;

use OtherNamespace\OtherClass;

// Now you can use the imported class without any errors
$otherClass = new OtherClass();