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Bright Nucleus Namespace Backtracer

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Get the namespace of the calling object, by scanning the debug backtrace, skipping a known set of namespaces & functions in the process.

Table Of Contents

Overview

This class/trait allows you to traverse the debug_backtrace() to find out what the calling class/function or the calling namespace is. This is useful in cases where you need to find out at runtime in what context a given method was called.

Installation

The best way to install this package is through Composer:

composer require brightnucleus/namespace-backtracer

Basic Usage

Setting Things Up

To create a new class that can fetch the caller's name or namespace, you can either extend the BrightNucleus\NamespaceBacktracer\NamespaceBacktracerClass class or, should you already have a class you need to extend, you can import the BrightNucleus\NamespaceBacktracer\NamespaceBacktracerTrait trait.

In both cases you'll want to override one or more of the three methods that allow you to adapt the behavior to your environment:

  • getIgnoredInterfaces()

This gets the list of interfaces/classes to ignore while traversing the backtrace.

  • getIgnoredFunctions()

This gets the list of functions to ignore while traversing the backtrace.

  • getGlobalNamespace()

This defines by what string the global namespace is represented.

Making The Call

To get the caller's namespace for a specific call, you pass the output of debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS) that was executed from within the callee to the getCallingNamespace() method. If you don't provide a debug_backtrace output, it will get fetched within the trait (which might be a different context than the one you want to check).

Example:

<?php

namespace CalleeNamespace {

    use BrightNucleus\NamespaceBacktracer\NamespaceBacktracerTrait;

    class Callee {

        use NamespaceBacktracerTrait;

        protected function getIgnoredInterfaces() {
            return [
                'CalleeNamespace\Callee',
            ];
        }

        public function calledFunctionGetCaller() {
            echo $this->getCaller();
        }

        public function calledFunctionGetNamespace() {
            echo $this->getCallingNamespace();
        }
    }

}

namespace CallerNamespace {

    use CalleeNamespace\Callee;

    class Caller {

        public function callingFunctionGetCaller() {
            $callee = new Callee();
            $callee->calledFunctionGetCaller();
        }

        public function callingFunctionGetNamespace() {
            $callee = new Callee();
            $callee->calledFunctionGetNamespace();
        }
    }
}

$caller = new CallerNamespace\Caller();

// This will echo "CallerNamespace\Caller" from within the
// CalleeNamespace\Callee\calledFunction() method.
$caller->callingFunctionGetCaller();

// This will echo "CallerNamespace" from within the
// CalleeNamespace\Callee\calledFunction() method.
$caller->callingFunctionGetNamespace();

Contributing

All feedback / bug reports / pull requests are welcome.

License

Copyright (c) 2016 Alain Schlesser, Bright Nucleus

This code is licensed under the MIT License.

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Get the namespace of the calling object.

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