is it possible to get list of defined namespaces

Question

HI there,

I was wondering if there is a way in php 5.3+ to get a list of defined namespaces within an application. so

if file 1 has namespace F

Answer 1

Firstly, to see if a class exists, used class_exists.

Secondly, you can get a list of classes with namespace using get_declared_classes.

In the simplest case, you can use this to find a matching namespace from all declared class names:

function namespaceExists($namespace) {
    $namespace .= "\\";
    foreach(get_declared_classes() as $name)
        if(strpos($name, $namespace) === 0) return true;
    return false;
}

Another example, the following script produces a hierarchical array structure of declared namespaces:

Gives:

Array
(
    [FirstNamespace] => 
    [SecondNamespace] => Array
        (
            [FirstSubNamespace] => 
        )
    [ThirdNamespace] => Array
        (
            [FirstSubNamespace] => 
            [SecondSubNamespace] => 

        )
)