Does anybody know PHP odbc_exec() and unlink() failure cases?

Question

Can anybody please help me know conditions which PHP odbc_exec() and unlink() functions fail on?

I read PHP documentation and it says, each of these two functions return TRUE on success and FALSE on failure.

I know that odbc_exec() fails if,
There's no database connection.
There's a syntax error in SQL statement.

I also know that unlink() fails if,
There's not such an input file.
The write permission is blocked.

What I want to know is other cases which these two functions fail on...

Answer 1

Those are the only failures I know of, I don't use those functions regularly though, especially not unlink or any file system function.

Answer 2

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Answer 3

god knows