Description:
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I have PHP v7.2.21 installed as Apache module (php7apache2_4.dll). Apache is installed in C:\Apache24 and PHP is installed in C:\Apache24\php. I use Windows 7 SP1.
I cannot use current directory or relative directory in php.ini for extension_dir
This also occurs with v7.1.31 and v7.3.8
If I use an absolute path, it works.

Test script:
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extension_dir = "./ext"
extension=pdo_sqlite
extension=sqlite3

or

extension_dir = "ext"
extension=pdo_sqlite
extension=sqlite3

Expected result:
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sqlite module is loaded.

Actual result:
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sqlite module is not loaded.