拥有Laravel中所有页面的常量

Question

I want to have some constants to have IP, platform, browser to be placed in a single file and to be used in all views and controllers like so:

// inside app/config/constants.php

return [
    'IP' => 'some ip'
];

// inside controller

echo Config::get('constants.IP');

But instead of 'some ip', I want to use Request::ip() at least or even better, to use parse_user_agent()['platform'] that its code link is here

Answer 1

Simply you may put something like this in your config file:

return [
    'ip' => app('request')->ip()
];

I use a little customized one for my sitewise configs, for example, let's say you want to use something like this:

/**
 * Get config/constants.php
 *
 * [
 * 'person' => [
 *     'name' => 'Me',
 *     'age' => 1000
 *   ]
 * ];
 */
$name = constants('person.name');

So, to achieve this you need to write a function like:

// Helpers/Common.php
function constants($key = null)
{
    $constants = config('constants');
    return is_null($key) ? $constants : array_get($constants, $key);
}

Now, in your composer.json file you may add the following files entry:

"psr-4": {
        "App\\": "app/"
 },
 "files": ["Helpers/Common.php"]

Then you need to add the constants.php in config directory for example:

<?php

return [
    "ip" => app('request')->ip(),
    "person" => [
        "name" => "Sheikh Heera",
        "age" => 10000
    ],
];

Finally, just run composer-dump from terminal and you are done. So, if the ip key is available in the array then you may just try this:

$ip = constants('ip');

From the view (Blade), you may use following to echo out the ip:

{{ constants('ip') }}

Let's sum up the whole process:

• Create a directory in your project root (or inside app if you wish) as Helpers.

• Create the Common.php file in that directory and put the array (return it)

• Put the constants function (given above) in the Common.php file

• Add the files (given above) key in your composer.json file

• Run composer-dump to update autoload files

That's it. Use the file name and helper function name that describes your domian, so instead of constants you may use for example: site or your domain name as well.