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Comet Server leak memory in PHP

Why is a server Comet, such as Tornado, especially prone to memory leaks if it is written in PHP?

Are there any real flaws specific to PHPimplementing a long survey structure / service, for example Tornado?

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Its essence is that PHP was originally written with the intention of having a completely new process for each request that you could just throw away as soon as the request is complete, while things like Comet and a lengthy poll are actually were not on the table.

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