PHP Manual
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# New Extensions

The following are new extensions added (by default) as of PHP 5.2.0:

- Filter - validates and filters data, and is designed for use with insecure data such as user input. This extension is enabled by default; the default mode RAW does not impact input data in any way.

- JSON - implements the JavaScript Object Notation (JSON) data interchange format. This extension is enabled by default.

- Zip - enables you to transparently read or write ZIP compressed archives and the files inside them.

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