Datumfunctie

Hey,

Ik zit mn oude backups te ordenen zodat ik Windows 7 kan installeren, en ik kwam een oud scriptje van me tegen. Je hebt er niets aan, maar het idee erachter is wel leuk. Je kunt de dag van de week berekenen zonder een datumfunctie te gebruiken.
Het script:

[COLOR= #0000BB]<?php 
$datum[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #DD0000]13 mei 2009[/COLOR][COLOR= #007700];[/COLOR] 

[COLOR= #0000BB]$welke[/COLOR] [COLOR= #007700]=[/COLOR] [URL="http://www.php.net/explode"]explode[/URL][COLOR= #007700]([/COLOR][COLOR= #DD0000] [/COLOR][COLOR= #007700],[/COLOR] [URL="http://www.php.net/strtolower"]strtolower[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$datum[/COLOR][COLOR= #007700]));[/COLOR] 

[COLOR= #0000BB]$maanden[/COLOR] [COLOR= #007700]=[/COLOR] [URL="http://www.php.net/array"]array[/URL][COLOR= #007700]([/COLOR] 
                    [COLOR= #DD0000]januari[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]0[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]februari[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]3[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]maart[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]3[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]april[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]6[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]mei[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]1[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]juni[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]4[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]juli[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]6[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]augustus[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]2[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]september[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]5[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]oktober[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]0[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]november[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]3[/COLOR][COLOR= #007700],[/COLOR] 
                    [COLOR= #DD0000]december[/COLOR] [COLOR= #007700]=>[/COLOR] [COLOR= #0000BB]5[/COLOR] 
                [COLOR= #007700]);[/COLOR] 
                 
[COLOR= #0000BB]$year[/COLOR] [COLOR= #007700]=[/COLOR] [URL="http://www.php.net/strlen"]strlen[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]2[/COLOR][COLOR= #007700]]) ==[/COLOR] [COLOR= #0000BB]4[/COLOR] [COLOR= #007700]?[/COLOR] [URL="http://www.php.net/substr"]substr[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]2[/COLOR][COLOR= #007700]],[/COLOR] [COLOR= #0000BB]2[/COLOR][COLOR= #007700]) :[/COLOR] [COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]2[/COLOR][COLOR= #007700]];[/COLOR] 
[COLOR= #0000BB]$year[/COLOR] [COLOR= #007700]=[/COLOR] [URL="http://www.php.net/floor"]floor[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$year[/COLOR] / [COLOR= #0000BB]4[/COLOR][COLOR= #007700]) +[/COLOR] [COLOR= #0000BB]$year[/COLOR][COLOR= #007700];[/COLOR] 

[COLOR= #0000BB]$month[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #0000BB]$maanden[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]1[/COLOR][COLOR= #007700]]] +[/COLOR] [COLOR= #0000BB]$year[/COLOR] [COLOR= #007700]%[/COLOR] [COLOR= #0000BB]7[/COLOR][COLOR= #007700];[/COLOR] 

[COLOR= #0000BB]$day[/COLOR] [COLOR= #007700]= ([/COLOR] [COLOR= #0000BB]$month[/COLOR] [COLOR= #007700]+[/COLOR] [COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]0[/COLOR][COLOR= #007700]] ) %[/COLOR] [COLOR= #0000BB]7[/COLOR][COLOR= #007700];[/COLOR] 

[URL="http://www.php.net/if"]if[/URL][COLOR= #007700]([/COLOR][URL="http://www.php.net/strlen"]strlen[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]2[/COLOR][COLOR= #007700]]) ==[/COLOR] [COLOR= #0000BB]2[/COLOR][COLOR= #007700]) 
{[/COLOR] 
     
    [COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]2[/COLOR][COLOR= #007700]] =[/COLOR] [COLOR= #DD0000]20[/COLOR][COLOR= #007700].[/COLOR][COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]2[/COLOR][COLOR= #007700]]; 

}[/COLOR] 

[COLOR= #0000BB]$leap[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]2[/COLOR][COLOR= #007700]] %[/COLOR] [COLOR= #0000BB]4[/COLOR] [COLOR= #007700]==[/COLOR] [COLOR= #0000BB]0[/COLOR] [COLOR= #007700]||[/COLOR] [COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]2[/COLOR][COLOR= #007700]] %[/COLOR] [COLOR= #0000BB]100[/COLOR] [COLOR= #007700]==[/COLOR] [COLOR= #0000BB]0[/COLOR] [COLOR= #007700]||[/COLOR] [COLOR= #0000BB]$welke[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]2[/COLOR][COLOR= #007700]] %[/COLOR] [COLOR= #0000BB]400[/COLOR] [COLOR= #007700]==[/COLOR] [COLOR= #0000BB]0[/COLOR] [COLOR= #007700]?[/COLOR] [COLOR= #0000BB]1[/COLOR] [COLOR= #007700]:[/COLOR] [COLOR= #0000BB]0[/COLOR][COLOR= #007700];[/COLOR] 

[COLOR= #0000BB]$leap[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #0000BB]6[/COLOR] [COLOR= #007700]-[/COLOR] [COLOR= #0000BB]$leap[/COLOR][COLOR= #007700];[/COLOR] 

[COLOR= #0000BB]$einde[/COLOR] [COLOR= #007700]= ([/COLOR] [COLOR= #0000BB]$day[/COLOR] [COLOR= #007700]+[/COLOR] [COLOR= #0000BB]$leap[/COLOR] [COLOR= #007700]) %[/COLOR] [COLOR= #0000BB]7[/COLOR][COLOR= #007700];[/COLOR] 

[COLOR= #0000BB]$dagen[/COLOR] [COLOR= #007700]=[/COLOR] [URL="http://www.php.net/array"]array[/URL][COLOR= #007700]([/COLOR] 
                [COLOR= #DD0000]Zondag[/COLOR][COLOR= #007700],[/COLOR] 
                [COLOR= #DD0000]Maandag[/COLOR][COLOR= #007700],[/COLOR] 
                [COLOR= #DD0000]Dinsdag[/COLOR][COLOR= #007700],[/COLOR] 
                [COLOR= #DD0000]Woensdag[/COLOR][COLOR= #007700],[/COLOR] 
                [COLOR= #DD0000]Donderdag[/COLOR][COLOR= #007700],[/COLOR] 
                [COLOR= #DD0000]Vrijdag[/COLOR][COLOR= #007700],[/COLOR] 
                [COLOR= #DD0000]Zaterdag[/COLOR] 
            [COLOR= #007700]);[/COLOR] 
[URL="http://www.php.net/echo"]echo[/URL] [COLOR= #0000BB]$datum[/COLOR][COLOR= #007700].[/COLOR][COLOR= #DD0000] valt op een: [/COLOR][COLOR= #007700].[/COLOR][COLOR= #0000BB]$dagen[/COLOR][COLOR= #007700][[/COLOR][COLOR= #0000BB]$einde[/COLOR][COLOR= #007700]];[/COLOR] 
?>

Ik meen me te herinneren dat hij niet voor alle jaartallen werkt, maar dat weet ik niet precies meer.
De uitleg ervan vind je hier:
Engels: http://en.wikipedia.org/wiki/Calculating_the_day_of_the_week
Nederlands: http://nl.wikipedia.org/wiki/Berekening_dag_van_de_week

Je hebt er niks aan zoals ik al zei, maar misschien dat iemand t leuk vind ofzo, geen idee.
Lennard.

Had je niet al es zoiets geüpload? =D

Oh dat kan wel, kon het me niet herinneren.

Dit heb je al geupload,
http://www.one2xs.com/threads/2027

dat staat zelfs in Tutorials

Wow, goeie zoekskills. !

Nja dan gaat deze dicht.