PECL is not generating DLLs from 7.x hence we have generated DLLs for all 7.x version and uploaded same in github directory. So any user can download specific version DLLs from link as per their requirement and can use it.
1) Download the php_ibm_db2 DLLs for PHP 7.x(7.0, 7.1, 7.2) from below link.
https://github.com/ibmdb/php_ibm_db2
As of now (x64) DLLs for PHP 7.2 and PHP 7.3 are available. We will upload x86 DLLs soon.
2) For PHP 5.x, Download the DLL from Pecl itself. Pasted the link below.
https://pecl.php.net/package/ibm_db2
Blog to install and compile PHP ibm_db2 for Linux and windows is pasted below.
https://www.ibm.com/developerworks/community/blogs/96960515-2ea1-4391-8170-b0515d08e4da/entry/Install_PHP_ibm_db2_Driver?lang=en