unable to load dynamic library 'oci8_12c'

I have spended almost 4days...Still don't get the way to solve it.

Please help me...

I would like to connect to Oracle database-11g through Laravel 5.7.1

I have created the Environment Variables for Path- C:\instantclient_12_2 and TNS_ADMIN- C:\instantclient_12_2 as well,

put the php_oci8-2.1.8-7.2-ts-vc15-x64 file in xampp/php/ext and

added the extensions in PHP.ini

[Oracle_10]

extension=php_oci8.dll

[Oracle_11g]

extension=php_oci8_11g.dll

[Oracle_12c]

extension=php_oci8_12c.dll

Tried to install Instant Client for Wins 64-bits or 32-bits/18.3 or 12.2 still can't not loaded the php_oci8-2.1.8-7.2-ts-vc15-x64.

What's the problem?

My computer config:

Win7 Sp1-64Bit      PHP 7.2.1   XAMPP v3.22