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Installation on Linux Systems

From sources

Download and install » libJudy, then : 

     phpize
     ./configure --with-judy[=DIR]
     make
     make test
     make install

Ubuntu/Debian

libJudy can be installed with apt-get : 

    apt-get install libjudydebian1 libjudy-dev
Then by installing the Judy extension from PECL or from the sources.

Installation on Windows Systems

Download » libJudy, then extract the sources and open the Visual Studio command prompt and navigate to the source directory. Then execute : 

build
This creates "Judy.lib", copy this into the php-sdk library folder and name it "libJudy.lib" Then copy the include file "judy.h" into the php-sdk includes folder.

Next, the PHP Judy extension can be installed from PECL or from the sources by extracting the pecl/judy into your build folder where the build scripts will be able to pick it up, e.g.: 

    C:\php\pecl\judy\
If your source of PHP is located in: 
    C:\php\src\
The rest of the steps is pretty straight forward, like any other external extension: 
    buildconf
    configure --with-judy=shared
    nmake

Installation on macOS

Download and install » libJudy. Then install the Judy extension from PECL or from the sources.