$ git clone git://github.com/yuya-takeyama/LisPHP.git
$ cd LisPHP/
$ ./bin/lis.php
Welcome to REPL for LisPHP!
Input your LisPHP code and press Ctrl+D to evaluate it.

lis.php > ['define', 'PI', 3.1415926535]
NULL
lis.php > ':PI'
float(3.1415926535)
lis.php > ['define', 'area', ['lambda', ['r'], ['*', ':r', ['*', ':r', ':PI']]]]
NULL
lis.php > ['area', 1]
float(3.1415926535)
lis.php > ['area', 3]
float(28.2743338815)