Use of undefined constant JSON_INVALID_UTF8_SUBSTITUTE - assumed 'JSON_INVALID_UTF8_SUBSTITUTE'

Question

I recently cloned a laravel project and after running composer install, I am getting this error

In LogManager.php line 416:

Use of undefined constant JSON_I         


        

Answer 1

You should upgrade your php version to 7.2+. If that is not possible, here is a fix that i used. Just add this to your index.php file:

if (!defined('JSON_INVALID_UTF8_SUBSTITUTE')) {
    //PHP < 7.2 Define it as 0 so it does nothing
    define('JSON_INVALID_UTF8_SUBSTITUTE', 0);
}