Share a variable through out Laravel application

Question

I have a variable.

$key_test = 123456789;

I want to be able to access this 1 variable anywhere in my app even in config files, models, controllers, and views.

I've tried adding it in my boot():

<?php

namespace App\Providers;
use Illuminate\Support\ServiceProvider;
use App\VSE, App\CURL;
use View;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {

        $key_test = 123456789;

    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}

I've tried to access it in one of my config file. I kept getting null.

<?php

dd($key_test); <---- null

return [ ... ];

How do I access that variable in my config file?

Did I do it right in my boot()?

How do I do that ? Where do I do that ? in my boot() in my Service Provider file ? Feel free to give more hints or answer. — code-8, Mar 14 '17 at 15:46
that's depends upon your flow or logic where is best you can use it — M Maavia, Mar 14 '17 at 15:50
This is my flow. I need to query my database first, get the result of that, store in a variable, and share that variable. How can I achieve that ? If you can help me with that, you save my life. :) — code-8, Mar 14 '17 at 15:52
in my case if i have login application than i will save it on success login if i have solo application than i will do it in constructor of class and make object of it in each controller — M Maavia, Mar 14 '17 at 15:53
if you make database call every time it make your application slow — M Maavia, Mar 14 '17 at 15:53
How can I do that only time not everytime ? How I just want to access that variable in one of my config file ... — code-8, Mar 14 '17 at 15:54

score 3 · Answer 1 · answered Mar 14 '17 at 15:28

3

Put this variable into the .env file:

VAR=123456789;

Then you'll be able to access it with env('VAR'); from config files, models, controllers and other classes.

answered Mar 14 '17 at 15:28

Alexey Mezenin

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I like your suggestion about .env file. But what if I need to query my database first, get the result of that, store in a variable, and share that variable. How can I achieve that in .env ? Do you have other suggestions fo me ? – code-8 Mar 14 '17 at 15:42
2

.env are only really good for static variables, you might be better off using the `config()` helper for site wide configurations. – Ian Mar 14 '17 at 15:43
@ihue in this case just set variable to the config with `config(['var' => 123456789])` and then you'll be able to get the variable value with `config('var')`. But it won't work in you want to get this value in config files. – Alexey Mezenin Mar 14 '17 at 16:29
@lan I agree that `config()` is better, but OP asked about getting this variable even in config files. `config()` won't work here, only `env()` will. – Alexey Mezenin Mar 14 '17 at 16:30

score 3 · Accepted Answer · answered Mar 14 '17 at 15:43

3

You can use a helper method for config.

config(['key_test'=>123456789])

Then access it through the same way,

config('key_test')

answered Mar 14 '17 at 15:43

Ian

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2

Yeah I prefer config over .env, unless it really is environment specific. – DevK Mar 14 '17 at 15:43
My thoughts exactly @devk. – Ian Mar 14 '17 at 15:44
Where exactly should I place this line of code `config(['key_test'=>123456789])` ? in my `boot()` ? – code-8 Mar 14 '17 at 15:44
@lan : I agree with you guys as well, .env file should only be use for environemnt specific. – code-8 Mar 14 '17 at 15:45
@ihue Place it in your Service Providers boot method – Ian Mar 14 '17 at 15:54
I tried that and I got null printing out. How can I debug it further ? – code-8 Mar 14 '17 at 15:55
I did `public function boot() { config(['key_test'=>123456789]); } ` – code-8 Mar 14 '17 at 15:56
Then, call it, ` – code-8 Mar 14 '17 at 15:56
Result : `null` – code-8 Mar 14 '17 at 15:57
You need to call `config('key_test')` not `$key_test` – Ian Mar 14 '17 at 15:59
@lan OP asked about getting this variable even in config files. config() won't work here, only env() will. Here's the quote `I want to be able to access this 1 variable anywhere in my app even in config files` – Alexey Mezenin Mar 14 '17 at 16:32
@lan : Yes that what I did. `public function boot() { config(['key_test'=>123456789]); }` – code-8 Mar 14 '17 at 16:45
@lan I didn't include `$` when I config it. I only include `$` when I try to call it. Why ? Am I not suppose to do that ? – code-8 Mar 14 '17 at 16:47
No because you are not calling a variable, you are calling a function which returns a value @ihue. – Ian Mar 15 '17 at 09:05
@ihue Maybe you should learn the basics of PHP / Laravel, the documentation for `config()` is at https://laravel.com/docs/5.4/helpers#method-config – Ian Mar 15 '17 at 09:06
I did as your answer and I kept getting `null` – code-8 Mar 15 '17 at 18:25

score 1 · Answer 3 · answered Mar 14 '17 at 15:31

1

you have some choice here, for global variable, session, file, db, or in the memory with redis or memcache.

answered Mar 14 '17 at 15:31

LF00

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I like your suggestion aboutglobal variable, session, file, db, or in the memory with redis or memcache. But what if I need to query my database first, get the result of that, store in a variable, and share that variable. Can I still achive when doing one of those above that you mentioned. If so, where should I do that ? in what file ? in my service provicer ? – code-8 Mar 14 '17 at 15:43

Share a variable through out Laravel application

3 Answers3