It depends on the developer. I don't think early returns are much of an issue personally, depending on the use case. If there is an error, I would expect an exception to be thrown instead.
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I have to agree with others. I don't like the multiple returns, unless it's the early return because of an error.
I would prefer something like this(I don't know what language it is, so just guessing here):
This clearly reads top to bottom, GetName:
Name is firstName.
If lastName exists, name is firstName plus lastName.
Return name.
It's PHP.
It depends on the developer. I don't think early returns are much of an issue personally, depending on the use case. If there is an error, I would expect an exception to be thrown instead.