Hi, internals

I'm currently working on renovating odbc_connect and odbc_pconnect. 
https://github.com/php/php-src/pull/12306

As a problem came up, I'm planning to create an RFC.

I explain the problem briefly.

In addition to the dsn, these functions have a credential argument. They are 
required and expect string. The following two cases are problematic here.
1. If the password is set to a blank character ('')
2. For authentication that does not require a password

Since the current signature does not allow nulls, we cannot separate the 
handling of these cases and must give up on one of them.

Therefore, I am thinking of changing the credential argument to be nullable and 
optional for these functions, like pdo.

What do you think?

Best regards.

Saki
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