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What Is PHP? Why Are Government and Business Websites Going Offline?

A critical security flaw in the programming language underpinning much of the web has prompted a global rush to patch vulnerable systems.

© Vincent West/Reuters

A programmer in Guernica, Spain, on Thursday, working on PHP code, software used throughout the internet.
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PHP Security Flaw Sets Off Global Rush to Patch, Leaving Websites Offline

Governments and businesses around the world scrambled to prevent hackers from exploiting a vulnerability in PHP, a popular programming language.

© Geert Vanden Wijngaert/Associated Press

Prime Minister Rob Jetten of the Netherlands in Brussels last week. He said that his cabinet was closely monitoring the online vulnerability caused by a security flaw in PHP.
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