Description:
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Using addslashes to escape the input for the database is a really bad idea. But the doc of the function still describe it as the use case (and then warns that there is better ways to do it).

I think it would be better to avoid mentionning the database escaping for the use case of the function, to avoid teaching unsecure practices.
Lazy people would stop reading before the end of the description and only see the suggestion of using it for escaping.