PHP Implementation of HashCash

Does anyone know of a PHP implementation of hashcash?

Also, is there an estimate of what percentage of mail servers support hashcash?
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sypderAsked:
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grbladesCommented:
HashCash is supported in spamassassin versions 3.0 and upwards. Spamassassin is probably the most popular antispam system for mail servers so it should be widely supported.


I could not find a php library for hashcash but wordpress does have hashcash support and it is written in php. See http://elliottback.com/wp/archives/2005/10/23/wordpress-hashcash-30-beta/
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sypderAuthor Commented:
I am surprised there is not a php library, I had no lucky with Google. I will take a look at wordpress and try to understand it.
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