CODEWITHSUNDEEP
php
Derek Pollard
Derek Pollard

Reputation: 7165

Performance of importing classes with and without the use keyword

Consider the following:

I have a class that does some mild reporting,

example 1

<?php
    namespace App\Log;

    class Reporting
    {   
        private $config;

        function __construct($config)
        {
            $this->config = $config;
        }

        public function ReportSomething($action)
        {
            // blah blah, sends data to a server
        }
    }
?>

Then I also class where I want to use the Reporting class multiple times:

example 2

<?php
    namespace App\Controller

    use App\Log\Reporting;

    class DoStuff
    {

        public function getUser() 
        {
            // blah blah, business logic
            $reporting = new Reporting($config);
            $reporting->ReportSomething('going to db');
            $reporting->ReportSomething('got data');

            $reporting2 = new Reporting($newConfig);
            $reporting2->ReportSomething('preparing to send');
            $reporting2->ReportSomething('sent');
        }

        public function getPosts() 
        {
            // blah blah, business logic
            $reporting = new Reporting($config);
            $reporting->ReportSomething('going to db');
            $reporting->ReportSomething('got data');

            $reporting2 = new Reporting($newConfig);
            $reporting2->ReportSomething('preparing to send');
            $reporting2->ReportSomething('sent');
        }

        /* you get the point */
    }
?>

My question is: performance wise, what would be the impact if I were to use this type of style instead:

example 3

<?php
    namespace App\Controller

    class DoStuff
    {

        public function getUser() 
        {
            // blah blah, business logic
            $reporting = new \App\Log\Reporting($config);
            $reporting->ReportSomething('going to db');
            $reporting->ReportSomething('got data');

            $reporting2 = new \App\Log\Reporting($newConfig);
            $reporting2->ReportSomething('preparing to send');
            $reporting2->ReportSomething('sent');
        }

        public function getPosts() 
        {
            // blah blah, business logic
            $reporting = new \App\Log\Reporting($config);
            $reporting->ReportSomething('going to db');
            $reporting->ReportSomething('got data');

            $reporting2 = new \App\Log\Reporting($newConfig);
            $reporting2->ReportSomething('preparing to send');
            $reporting2->ReportSomething('sent');
        }

        /* you get the point */
    }
?>

Where, as you can see, example 3 no longer uses the use keyword to import, but rather does new \App\Log\Reporting each time it wants to obtain a new instance of the Reporting class.

Are there any downsides to either use cases? Is one better (based on some data or information) than another, and why?

Upvotes: 1

Views: 99

Answers (1)

Dash Winterson
Dash Winterson

Reputation: 1295

use and namespace don't actually access the class, they simply store the namespace or class as a string so they will run at relatively similar speeds. Given that I would go for example 2 since it encourages the organizational structure thats offered by using those keywords.

Upvotes: 3

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