Portal
Webmail
dog.net
dog.net pics
dog.net spamtrap
Blacknbeauty
Admin@mbox3.magellan-net.de
alina@yourmx.de
bm@schweinischer-bote.de
boris@cosmeta.de
boss@dan2n.de
btiggemann@mbox3.magellan-net.de
catcher009@blacknbeauty.de
Christopher_Zantopp@web.de
dok123@discardmail.com
dominik.keilbach@rocketmail.com
dominik2712@web.de
einkauf@dan2n.de
elke@kunesch.eu
erik_burgbacher_bi17l4lo@send.electronicmailfor.me.uk
feedme@die-bauer.de
feedme@dog-net.org
feedme@drakensang.de-web.cc
feedme@kraffner.de
feedme@schlaegel.it
feedme@sql-kunesch.de
feedme@wipeout6.de
fetcher@open-host.de
frank@spiracyworld.co.uk
getspam@schlaegel-online.de
harun-ali@web.de
iCollectGarbage@gmx.de
ifyoudone@r0ckt.de
ifyyou@r0ckt.de
info@die-bauer.de
info@mbox3.magellan-net.de
info@r0ckt.de
info@rbcms.de
john.deer@spamreducer.eu
john@cannedmeat.elementfx.com
k.tramm@xspin.de
Karl-Heinz.Becher@gmx.de
Kevin.Becaud@bio-muesli.info
kickers88@live.de
knuddels119k@yahoo.de
loremiosumsitdoloramet@yahoo.de
loremiosumsitdoloramet@yahoo.de
lotharwalter@ymail.com
luna@r0ckt.de
matz0302oyqp@domut.de
mgoessel@gmx.net
michael.k@drakensang.de-web.cc
michael.k@drakensang.de-web.cc
michael.k@sql-kunesch.de
michaknopf@googlemail.com
mk@r0ckt.de
msneijder@mbox3.magellan-net.de
nasti_mkorsa@sql-kunesch.de
newcyborg@gmx.net
schlucks@gmx.net
schwarz@die-bauer.de
service@mbox3.magellan-net.de
sp4mf4ng@j-schmitz.net
spam@teh1.de
spamcatcher@spamtrap.dtdns.net
spamela@spamschlucker.org
spamhog.ihatespam@gmail.com
spamlearn@schlarb-it.de
spamlearn@schlarb-it.de
spamtarget@junge-piraten.de
spamtrap@r0ckt.de
spamtrap@sprachdidaktik.org
spoof@dog-net.org
stephan@spamschlucker.org
support@mbox3.magellan-net.de
thanks@marvin-webservice.net
trap.mitschutz@sprachdidaktik.org
trap@sprachdidakt.de
trap@sprachdidaktik.org
trep@marvin-webservice.net
unwanted@shadowpage.de
vertrieb@dan2n.de
wb@munzinger.de
willmehr@drakensang.de-web.cc
willmehr@drakensang.de-web.cc
willmehr@wipeout6.de
wir@dragoncrew.de
xkbzy@grossermist.de
a Image
fav

Share this:

৺Section (Development)
৺SubSection (PHP)
৺Post (rand or mt_rand?)

Development ≫ PHP | 2009-08-26 16:35:21

rand or mt_rand?


Random numbers are often useful - but those are these pseudo random numbers really random?

my ৺captcha script was based on the rand() function. Since ive ported my side from apache to the ৺IIS it wasn real random...

now i found the function ৺mt_rand which brought back a good randomness.

Heres a compare of rand and ৺mt_rand:

Another Pic
using rand() - not really random...


Another Pic
using mt_rand() - better ....


Heres the code, used for the pictures. Creating random numbers between 0 and 1 shows the real power of a random function:

  1.  
  2. <?
  3. // Requires the GD Library
  4. header("Content-type: image/png");
  5. $im = imagecreatetruecolor(512, 512)
  6.     or die("Cannot Initialize new GD image stream");
  7. $white = imagecolorallocate($im, 255, 255, 255);
  8. for ($y=0; $y<512; $y++) {
  9.     for ($x=0; $x<512; $x++) {
  10.         if (mt_rand(0,1) === 1) {
  11.             imagesetpixel($im, $x, $y, $white);
  12.         }
  13.     }
  14. }              
  15. imagepng($im);
  17. ?>
  18.  

Related Tags:

৺rand or mt_rand
৺rand
৺mt_rand

Stay tuned:

r a t y y

Top 25 Tag-Cloud (last 14 days):

about bitmapimage bitmapsource contact dog.net e easy hotlinking interaction language linkphonebook listview mesh planetary reaktions robotics share sql synchronisation to tyrannis vb vb.net worksheet xda

Trackbacks on this post:

৺Google Image Result for http://dog-...
৺Google Image Result for http://dog-...
৺Forum internetowej gry Atropia &...
৺php, rand or mt_rand - Google Searc...
৺PHP rand or mt_rand - Google-Suche...
৺&lt;?php $rand posts show conte...
৺4 results - TinEye...

Comments on this post:

Not yet a comment...

Leave a Comment:

Captcha-Code:        reload
Name:
Captcha:
Comment:

Donate!

Like my stuff? Feel free to donate!
 
Modellbau Forum pspad Browser-Statistiken WhatPulse logo dog-net.org Valid XHTML 1.0 Transitional CSS ist valide!

Development ≫ PHP | 2009-10-14 02:08:39

LeadImage

ImageCopyMergeAlpha

The GD-Lib is a very powerfull extension for PHP.

but in one case, it really fails.

read more...

Development ≫ PHP | 2009-08-19 23:27:25

LeadImage

Easy Permission Management System

Heres a sample of a easy ৺permission management system.

read more...

Development ≫ PHP | 2009-07-12 02:30:50

LeadImage

Captcha With Real Tff And Background

Here you can find a ৺captcha code, that uses real tiff fonts as well as random background images. This is a improved version of my older ৺captcha, which completly was made by colors, default fonts and shapes.

read more...

Development ≫ PHP | 2009-07-09 03:22:13

LeadImage

MySQL Connection Class

A Long time ago, i wrote a Class, that makes ৺SQL-Querys easier. Nearly everything is done without caring about all the PHP ৺SQL-Functions.

read more...

Development ≫ PHP | 2009-07-09 03:22:05

LeadImage

MakeNiceSize

This is the php function, i use to create user friendly file size strings. Sizes like 215742435 byte or 0,00000000023 GB are NOT user friendly.

read more...

Development ≫ PHP | 2009-07-09 03:21:44

LeadImage

Dynamic Style Sheets



read more...
Copyright © 2008 - 2010 | by dog.net Development | Imprint | Load in 1.042908