If I return part of the original string in a function, will the original string be freed?

php editor Yuzai is here to answer your question about whether the part returning the original string in the function will be released. If you return part of the original string in a function, the original string is not automatically freed. PHP uses reference counting to manage memory, and memory will only be released if there are no references. When a function returns part of the original string, the original string still has a reference and is therefore not released immediately. If you need to ensure that the original string is freed, you can manually dereference it using the unset() function. In this way, the original string will be released when there are no other references.

Question content

I learned that when using square brackets to get part of a string, Go does not create a new string but instead reflects the same underlying string, similar to slicing .

So in the function below, will the return part of the function prevent the original string from being released and cause a memory leak?

func Slice(str string, start int, end int) string {
    limit := len(str)

    if start < 0 {
        start = limit + start
    }

    if end < 0 {
        end = limit + end
    }

    if end > limit {
        end = limit
    }

    if start >= end || start >= limit {
        return "" // return an empty string directly
    }

    return str[start:end]
}

Workaround

When slicing a string, the resulting substring will share memory with the original substring. This also means that the original string will remain in memory.

Is this considered a memory leak? rely on. Usually a memory leak indicates an increase in memory usage, in this case the memory usage is not increasing, it's just keeping something in memory that you don't actually need/use anymore.

If you know you are slicing a large string and don't need the rest of the string, you can use strings.Clone() like this:

return strings.Clone(str[start:end])

Quoting the documentation of strings.Clone():

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