How to deprecate a function in PHP?
At the team with which I work, we have an old codebase using PHP's ibase_* functions all over the code to communicate with database. We created a wrapper to it that would do something else beside just calling the original function and I did a mass search-replace in the entire code to make sure that wrapper is used instead.

Now, how do we prevent usage of ibase_* functions in the future?

Preferably, I'd like to still have them available, but make it throw a NOTICE or WARNING when it is used.

A solution in pure PHP (not needing to compile a custom version of PHP) is preferred.
How to deprecate a function in PHP?
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At the team with which I work, we have an old codebase using PHP's ibase_* functions all over the code to communicate with database. We created a wrapper to it that would do something else beside just calling the original function and I did a mass search-replace in the entire code to make sure that wrapper is used instead.

Now, how do we prevent usage of ibase_* functions in the future?

Preferably, I'd like to still have them available, but make it throw a NOTICE or WARNING when it is used.

A solution in pure PHP (not needing to compile a custom version of PHP) is preferred.