LOL fp precision

I'm a code noob, so I'm teaching myself different concepts that I may need. I'm using PHP because it's easy. Today I was working on serialization... rendering live data in ram into a string so that it can be transmitted or stored statically.

I happened across some sillyness while dealing with a floating point number:

Code:

<?php
$ar["four"] = "chan";
$ar["foo"] = array("bar" => "foobar");
$ar["bob"] = "bob";
$ar["spleen"] = 199;
$ar[5] = 1.222;
$serialar = serialize($ar);
echo "$serialar\n";
$unserializedar = unserialize($serialar);
print_r ($unserializedar);
?>

output:

a:5:{s:4:"four";s:4:"chan";s:3:"foo";a:1:{s:3:"bar";s:6:"foobar";}s:3:"bob";s:3:
"bob";s:6:"spleen";i:199;i:5;d:1.22199999999999997513100424839649349451065063476
5625;}
Array
(
    [four] => chan
    [foo] => Array
        (
            [bar] => foobar
        )

    [bob] => bob
    [spleen] => 199
    [5] => 1.222
)

Welcome to programming.
Also, error_reporting(E_ALL);

Welcome to prologging.
Also, append(X, Y, Z).

I'm using PHP because it's easy.
Really bad idea. ``Unscientific and ultimately destructive'', as some might say.

Learn Python instead. Django is love.

>>5
Django daikazoku?

>>6

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>>7
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     　　　 /.:/　　　　　'" ￣￣ ヘ　　　　　＿＿　¨.二ﾆ=-
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     /.::/.:::.:::.::.::〃　＼ ＼／　/） V二ﾆ¨´¨`ヽ
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>>6
Have you watched your Clannad today?


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>>11
Shiny forehead is shiny.

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+ j6j+::+:+jjj+++j+++:::::+jjjj++++++jjj++:++++6j++b6jjMMMMMMMMMMMMMMMMMMMMMMMMMMMMMH+
+ j+:6j+++++::jjj66j+++++++jjj6++++++66jj++jjj++:jj++++jbHMMMMMMMMMMMMMMMMMMMMMMMMMMH+
+ +++j+++++jj++++:++jjjj+++j++j++++++b66j:::::::::::jj++jj6HMMMbHMMMMMMMMMMMMMMMMMMMH+
+ +++j+++++j++jjjj+++++jj++++++++++++++::.:.:..:.......::++jjHM6HMMMMMMMMMMMMMMMMMMHj:
: +j+j+++++j++++jj++jj++++++++++++:::.:......................++jjMMMMMMMMMMMMMMMMMMM+:
: +:+jj+++jj++++jj+++jjjjj+jj+j+:::.:....:.....................++6MMMMMMMMMMMMMMMMM6+
: ::+j6+++++j+j+jj+++6j+++j6j++::................................:+bHMMMMMMMMMMMMMMH.:
+ +j+j+++++++jjj6j+++6j+++j6+:::...................................:+6MMMMM6jMMMMMM+:
+ :+++++++++jjj6j+++jjjjj++++::::::::::...:..........................:jjbMH6bMHMMMMM+:
+ :+j++++++++:jj6j++++jjj+++:::::+++++++:::.::.......................:+j66bHbb6HbMMM+:
: +j+::++j++++j+++::+6++++::::+6bbbHHbb6bb6b6++:::::::................:j66HbHbb6666H+:
+ ++jjjjj6+:++jj+++++++++:.:jbHHHMMMMHHMMMHHbbb6jjjjjj+:::::............:+++++jbb6bb++
+ ++j+j++jjjjj66:++j+++j:::jbHHHMMMMMMMMMMMMMMHHHHHHbb+j+::..............+666+++j6bH++
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6 bbbHHHHHHHHHHHbbb6jjjj::+6HHHMMMMMMMMMMMMMMMMMMMMMMHHHHb+::::::.::::::+bbbbbbb6jjj++
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. ............:...:::.:..:..:.:...:++++++++j6bbHHHHHMMMMMMMMMM6::.::.:.:.:..:.::.:..::
. ..............:..:.:..:....:.:...::.:+++++++++++jjjjjjjjjj6+:::.:..:::::..:..:....::
. .........:.:..:..:.......:...:.:+++:++:+++++++++++++jj++++j::...:..:::..::.::.....::
. ..................:............:+j:::.:..+j+:.::.:::+jj++::.:....:.:...::.:.......:.
. .................:.............:++::+:::+jj+.:::::.:::::.::......:..:.:...:..:..:...
. ................:.............::+:::::::+j+:.+:::.:++:.::......:..::.:...:.:.....:..
. ..............................::+:+j+::jj+:.::.::.::.::.::.....:..:.....:.::........
. :..............................:::.+jj+..::::+::+++++::.:.:.....::...:....:.:.....:.
. ...............................:::+jjj:::j:::::+::::::.:..:.....:.::....:....:......
. .:.............................::.++j+.++j:..:+::.++.:....................:.........
. ..............................:++:++j+:.:j..:j:.:j+::....................:.:........
. ...............................:::j:..+j66+++++++:.:.................:....:.........
. ......................:.........:++.:+jjjj:.:.:++.................................:.
. ..............................:::j::::jj6+..:.:+...................................:
. ...............................:::..:++j6::+:.:.....................................
. ............................:+jjjjjjjj+j+.+::...::..................................
. ............................::+++j6j666j66jj:.......................................
. .............................::::.+::+:jjj+:........................................
. ..............................:..:j:::+j+.::.............................:.......:..
. .............................::::+j:.+6jj...........................................
. ...........................::::::j::+jj:............................................
. ...........................:+::+jj++jjj.............................................
. ...........................:::::+.:++j::............................................
. ...........................::::+:::+j:..............................................
. ...........................:::::::+j+.:.............................................
. ..........................::::+:.:j:................................................
. ..........................+::+j:+j:.................................................
. ..........................+:.:::::..................................................
. .........................:+::+:::...................................................
. .........................:::.+.:....................................................
. .................::::...::+:.+:.....................................................
. ........................::.:::::....................................................
. ........................::.+::......................................................

>>11
Is that George Costanza?

>>11
Is that RMS Mark Shuttleworth?

>>11
Here, I sorted that for you:
+++++++++++++++++++++++++++:,,,,:~~==++?++++==~:~=+?~====+++=~+=++++++++++++++++
++++++++++++++++++++++++++,:::,:::::~~==~~~:::~==+?~~=?=~+I+=~~~+7++++++++++++++
++++++++++++++++++++++++++,::::~~==+++++??????+~~~=+?~~7=~~~++++++++++++++++++++
+++++++++++++++++++++++++::~:~====+++++??????+?+==~=++++~~++++++++++++++++++++++
++++++++++++++++++++++++:::~~==~~~====++??????++++===+:+++++++++++++++++++++++++
+++++++++++++++++++++++:::==+==~~~~=+++++++++?++++++==++++++++++++++++++++++++++
+++++++++++++++++++++++::~~=+===~:~~=~=====??+?+++++=+~+++++++++++++++++++++++++
+++++++++++++++++++++,,~,,:.::::::,,,,,:::::~=++??+~~I++=~~+?7++=~~??=++++++++++
+++++++++++++++++++++:::~~=+==~:,,,,,,,~~,+++?++?++?+=++++++++++++++++++++++++++
++++++++++++++++++++,,,::~====~~===++?????++=~=+?++++===++++++++++++++++++++++++
+++++++++++++++++++,..:::,,.:::::::::::::~~==+++~==+?I=~~?=~+7??~~~==I7===++++++
+++++++++++++++++,~~::~:,,~,,::::::::::~~===++~~~~~7I+=~=+?+==~???=+~~~??=+==+++
+++++++++++++:,~~,,,,,~~,,:,,.:::::::~~~~==+===~~+?~++=:??+++~=+I7?=~~+++7?+~~+~
++++++++++:~=,::,,,,~,::,:~,,:~.:::~~~~~=+~~~~=77?~=~+=:??=~=?~=~=???++~~~~??7++
+++++++::++,=,,,=~,,,~~,.,,=:,,~~:~~~~~7~=~:=??7??~~+++?77=~=???~==+7I?~~~~++7??
+++++:+::::=~:::=~,,:+=:,,:=,::,.,:,,?=~~+=+??I~=+==~~=?I~++I7++?=++=~???++~~~~?
+++:~==+==?I~~~??~~~==::,::==~..,=,.,.~~~~+II====~I+==~??~=~+?=++?=++~~+77?=~~==
++:++~==~:++:::==::~=::::~:,+.,..:~:,.,~~???+=+~???++++?=~~~=+==I+~==?==+~??I=+~
:~:+=+=:~:++::++::::+~~~+:,~~,.,.~::==.+ ?~==~=?++=~++77++++?+==+?=~??~~~~????=~
=:,:?++++I==~I++=I~=~~+I?~=:++?+,:I?.,=~:,.~=+==~+===?+~=+II~+++===??~==~??~=?+=
=====+++++++++++++++:::::~=====~~~:~:~==+?+++++=++++++==++++++++++++++++++++++++
======+=+++++++++++~,:::~==++==~:,..,::~=++++++==+++++=+=+++++++++++++++++++++++
===========+++++++~,.,::~=+++++=:=~=+??+=~+??~=++++++==??+++++++++++++++++++++++
=============+=++=,,.::~~==++:~=:=~++?I???++=+???++++==+?++++++++++++++++++++==+
=============,,:,,~:.::==+=~::::~~=++:=~~~~~===~=+,=,,.,:::,====================
==============,,:....::~~:::~~::,:+~~~+=:~,?.,===++~..,:::~=====================
==============:,:~,:::~~~==++?+????IIIIIIII?????+?=:,,=~~~:=~===================
=================,...,~:::~=====~~:+?I?~??++++???++++=~,=++++++++===++==========
=================:,..:~==~====++~~~=????~????????++++=~:+++++++++++++=++++======
=================~...::===+++++=:~~=????+=:~?+:=??+++==+++++++++++++++++===+====
================~,,:,,,::~=+++??????????????+??+~:~~==~=========================
===============~:...:=::::,~,,==~:.+?I:~=~===++++==~=:.,~==++++=+===============
===============~::~,,.::~==++?+?????????????????=::~~=~=========================
==============~,,.,..:~:::~~,,~:,,~?I=?++=+++++~~~=,=,,:~:=====+================
==============~,::,:,,:~~==+??????I?IIIIII???+?+?=,,:~==========================
=============~:~,,::,:~~~=++?????IIIIIIIII??+?????~,:~~~========================
=============~==~~,,,:,,,:~=++???????????????+~,,,~~~===========================
=============~~~,,,~::~~~=++?????IIIIIIIIII?????+?+~,:~~========================
============~:,~~:,,::~===+++???????+?IIIII?????+?+~~~~~::::~===================
============~::::~~:,::====++??????????++=:~==~=?++=~.,:,:,:====================
============~:~~~::,,:~===+++??????????IIIIII???+++~,,:,:::~====================
============~~,,::::::~===+++????????IIIII?I??????=~,,~~::~~====================
=~===================,,:,,~,::::~===+==+++=,,,:~~~~~============================
~::+~+I==?I=~=I?=~+~~~~:=:=:~=,::.~~++,.7+===?==~??==~??=~+??+++I~=~??~~~=??~=++
~::~=?~~~??~~+?~~::?=+=I+:,,+=?+,~?I::~~~.??=+~~=I=++I?+=+~?~==+?===?~=~~7 =++?+
~====================~~::::~::::::~:~~~:,.,:::=:~~==============================
~=================~~::::,,:~:~=+++???+??????=:,,~=::============================
~~:~~=~~~??~:+?~~~~=~~~~+~+,=~==::=+=::,,++++?=~+??+=~?~===?+==?7?+=7I+++77?=+++
~~~==~=~================~~::,,,,,:::,::,~,::~~===~==============================
~~~~=~====================~~:~:::,,,:::,~:~~=~~~=~===========================~~=
~~~~~~~=============~=====~~~~~=~~~~~~~~~==~=~=====================~=======~=~=~

>>1
Please refer to IEEE 754.

s:4:"four";s:4:"chan"
I see what you did there. Also, bencoding is superior.

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Are you a NIGGER?
Are you a GAY NIGGER?

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