In How can I speed up this serialized array generation php script? the OP states, that they "bought one [...] script" from someone else. Since I could not identify if the script in question was also bought, I asked the OP in a comment to clarify this, since I thought it would be off-topic otherwise.
Another Code Review user then told me, that even if the OP bought it, "[t]his is on topic if the OP is going to maintain this going forward".
That left me wondering:
Is it okay to ask for a review of a piece of code that you did not write yourself, but bought from someone?
Reading the answer of Mathieu Guindon at Asking about code in a pull request to my code base here on meta seems to indicate that this is not the case.