Hello, i am new user for couchbase, i try install php extension, but i have error

PHP SDK
1

I am try install from this guide
https://docs.couchbase.com/php-sdk/current/start-using-sdk.html
for Ubuntu 18.04

when i checked extension i have this trouble 
PHP Warning:  PHP Startup: Unable to load dynamic library 'couchbase' (tried: /usr/lib/php/20190902/couchbase (/usr/lib/php/20190902/couchbase: cannot open shared object file: No such file or directory), /usr/lib/php/20190902/couchbase.so (/usr/lib/php/20190902/couchbase.so: undefined symbol: json_globals)) in Unknown on line 0

What doing i wrong ?

2

I fix it, i add in php.ini extension = json. But it enabled. Then i see this message
PHP Warning: Module 'json' already loaded in Unknown on line 0

3

The page you have referred says that couchbase.so depends on json.so, so you have to load it first.

4

this is because now you load it twice. To eliminate this message, you can remove the duplicate of json.so which comes after couchbase.so

5

no dublicate, json enabled default. Maybe him enabled in json.ini ?

6

i delete json.ini from conf.d . Then work fine.