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Installing/Configuring
PHP Manual

Installation

Zlib support in PHP is not enabled by default. You will need to configure PHP --with-zlib[=DIR]

The Windows version of PHP has built-in support for this extension. You do not need to load any additional extensions in order to use these functions.

Note: Built-in support for zlib on Windows is available with PHP 4.3.0.


Installing/Configuring
PHP Manual