Name
    lua-php-utils - PHP-style utility functions for LuaJIT 2.0

Synopsis
    local php = require "php.utils"

    local num = php.ip2long("10.32.236.4')
        -- num == 169929732

    num = php.ip2long("1000.3.4")
        -- num == nil

    local ip = php.long2ip(169929732)
        -- ip == "10.32.236.4"

    local ip = php.long2ip("bad arg")
        -- ip == nil

Installation
    You need LuaJIT 2.0: http://luajit.org/luajit.html

    Just copy the php/ directory (as a whole) to anywhere visible to your LuaJIT programs'
    lua module search paths setting.

Author
    Zhang "agentzh" Yichun <agentzh@gmail.com>

Copyright & License
    This library is licenced under the BSD license.

    Copyright (C) 2011, Zhang "agentzh" Yichun (章亦春) <agentzh@gmail.com>.

    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

        * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
    TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.