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What are 'some systems'?
Wikipedia's owner, the Wikimedia Foundation, pulled some systems to protect its content. This likely means they temporarily took down certain servers or parts of their website that were most vulnerable to the PHP flaws, ensuring the integrity and security of the information Wikipedia provides to millions of users worldwide.
Stories that explain this
Websites worldwide go offline after two serious flaws found in PHPQuestions this opens up
Who owns Wikipedia? What is PHP? What is a server?Related explainers
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