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Captcha image Text Size

P: n/a
Hi,

Learning PHP code; playing with various methods of generating captcha
codes:

In the code below, how would I change the size of the text displayed in
the captcha code?
Is it even possible with this method?
TIA,
Twayne

--------------------------
<?php

session_start();

$width = 120;

$height = 40;

$length = 5;

$baseList = '23456789abcdfghjkmnpqrstvwxyzABCDEFGHIJKLMNPQRSTU VWXYZ';

$code = "";

$counter = 0;

$image = @imagecreate($width, $height) or die('Cannot initialize GD!');

for( $i=0; $i<10; $i++ ) {

imageline($image,

mt_rand(0,$width), mt_rand(0,$height),

mt_rand(0,$width), mt_rand(0,$height),

imagecolorallocate($image, mt_rand(150,255),

mt_rand(150,255),

mt_rand(150,255)));

}

for( $i=0, $x=0; $i<$length; $i++ ) {

$actChar = substr($baseList, rand(0, strlen($baseList)-1), 1);

$x += 10 + mt_rand(0,10);

imagechar($image, mt_rand(3,5), $x, mt_rand(5,20), $actChar,

imagecolorallocate($image, mt_rand(0,155), mt_rand(0,155),
mt_rand(0,155)));

$code .= strtolower($actChar);

}
header('Content-Type: image/jpeg');

imagejpeg($image);

imagedestroy($image);

$_SESSION['securityCode'] = $code;

?>

\

---------------------------------


Apr 8 '08 #1
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11 Replies


P: n/a
..oO(Twayne)
>Learning PHP code; playing with various methods of generating captcha
codes:
You should forget it. Graphical CAPTCHAs are a huge accessibility
problem and many of them are already broken and can be read by bots.
They are definitely _not_ a solution.

Micha
Apr 8 '08 #3

P: n/a
<comp.lang.php>
<Michael Fesser>
<Tue, 08 Apr 2008 23:44:26 +0200>
<ij********************************@4ax.com>
Learning PHP code; playing with various methods of generating captcha
codes:

You should forget it. Graphical CAPTCHAs are a huge accessibility
problem and many of them are already broken and can be read by bots.
They are definitely _not_ a solution.
What do you suggest as a alternative ? .
--
www.krustov.co.uk
Apr 8 '08 #4

P: n/a
this may help you
http://www.php.net/manual/en/functio...char.php#54000
Thanks, I have that manual; it's a great reference and that's one way to
do it, for sure. What I'm really doing is going through a learning
process with PHP and the GD and using captcha for a subject. I have
about three different and excellent methods pulled together and I'm
trying to figure out how to use the best parts of each in one, new
method. Mostly noodling for the education.

Appreciate the comeback!
--
Regards,

Twayne

Open Office isn't just for wimps anymore;
OOo is a GREAT MS Office replacement
www.openoffice.org

Apr 9 '08 #5

P: n/a
rf
"Twayne" <no****@devnull.spamcop.netwrote in news:%IUKj.4310$mL2.220
@trndny03:
>.oO(Twayne)
>>Learning PHP code; playing with various methods of generating captcha
codes:

You should forget it. Graphical CAPTCHAs are a huge accessibility
problem and many of them are already broken and can be read by bots.
They are definitely _not_ a solution.

Micha

1. Who said anything about USING captcha codes on a web site? Only
you, I'm afraid.
Given that the vast majority of questions in this group relate to using
PHP to build web pages I would think the onus is on *you* to mention if
you are doing otherwise.
--
Richard
Killing all threads involving google groups
The Usenet Improvement Project: http://improve-usenet.org
Apr 9 '08 #6

P: n/a

"rf" <rf@x.invalidwrote in message
news:82****************@news-server.bigpond.net.au...
"Twayne" <no****@devnull.spamcop.netwrote in
news:%IUKj.4310$mL2.220
@trndny03:
>>.oO(Twayne)

Learning PHP code; playing with various methods of generating
captcha
codes:

You should forget it. Graphical CAPTCHAs are a huge accessibility
problem and many of them are already broken and can be read by
bots.
They are definitely _not_ a solution.

Micha

1. Who said anything about USING captcha codes on a web site?
Only
you, I'm afraid.

Given that the vast majority of questions in this group relate to
using
PHP to build web pages I would think the onus is on *you* to mention
if
you are doing otherwise.
--
Richard
Killing all threads involving google groups
The Usenet Improvement Project: http://improve-usenet.org
Ehm.... he DID mention that.
:-P
Richard.
Apr 9 '08 #7

P: n/a
rf
"Richard" <root@localhostwrote in news:47fc2c3d$0$30410$dbd4d001
@news.euronet.nl:
>
"rf" <rf@x.invalidwrote in message
news:82****************@news-server.bigpond.net.au...
>"Twayne" <no****@devnull.spamcop.netwrote in
news:%IUKj.4310$mL2.220
@trndny03:
>>>.oO(Twayne)

Learning PHP code; playing with various methods of generating
captcha
codes:

You should forget it. Graphical CAPTCHAs are a huge accessibility
problem and many of them are already broken and can be read by
bots.
They are definitely _not_ a solution.

Micha

1. Who said anything about USING captcha codes on a web site?
Only
you, I'm afraid.

Given that the vast majority of questions in this group relate to
using
PHP to build web pages I would think the onus is on *you* to mention
if
you are doing otherwise.
--
Richard
Killing all threads involving google groups
The Usenet Improvement Project: http://improve-usenet.org

Ehm.... he DID mention that.
:-P
Richard.

Perhaps you could indicate exactly in the above quoted thread where the
OP specifically stated that this was *not* for use in a publicly viewable
web site. In my experience people "learn PHP" by building their first web
page.

--
Richard
Killing all threads involving google groups
The Usenet Improvement Project: http://improve-usenet.org
Apr 9 '08 #8

P: n/a
Krustov wrote:
>They are definitely _not_ a solution.

What do you suggest as a alternative ? .
Here are some nice suggestions
http://www.w3.org/TR/turingtest/

best regards
Piotr
Apr 9 '08 #9

P: n/a
"Twayne" <no****@devnull.spamcop.netwrote in news:%IUKj.4310$mL2.220
@trndny03:
>>.oO(Twayne)

Learning PHP code; playing with various methods of generating
captcha codes:

You should forget it. Graphical CAPTCHAs are a huge accessibility
problem and many of them are already broken and can be read by bots.
They are definitely _not_ a solution.

Micha

1. Who said anything about USING captcha codes on a web site? Only
you, I'm afraid.

Given that the vast majority of questions in this group relate to
using PHP to build web pages I would think the onus is on *you* to
mention if you are doing otherwise.

lol, I *said* I was playing with it. Whether i plan to use it or not
has little to do with anything else. Any thinking person answers a
question and THEN if there are some followons, adds them as maybe
caveats or ... .
Answering questions that aren't asked are signs of ego problems at
the other end, IMO. I wrote the post properly for what I wanted to ask
about.

Twayne


Apr 9 '08 #10

P: n/a
"Richard" <root@localhostwrote in news:47fc2c3d$0$30410$dbd4d001
@news.euronet.nl:
>>
"rf" <rf@x.invalidwrote in message
news:82****************@news-server.bigpond.net.au...
>>"Twayne" <no****@devnull.spamcop.netwrote in
news:%IUKj.4310$mL2.220
@trndny03:

.oO(Twayne)
>
>Learning PHP code; playing with various methods of generating
>captcha
>codes:
>
You should forget it. Graphical CAPTCHAs are a huge accessibility
problem and many of them are already broken and can be read by
bots.
They are definitely _not_ a solution.
>
Micha

1. Who said anything about USING captcha codes on a web site?
Only
you, I'm afraid.

Given that the vast majority of questions in this group relate to
using
PHP to build web pages I would think the onus is on *you* to mention
if
you are doing otherwise.
--
Richard
Killing all threads involving google groups
The Usenet Improvement Project: http://improve-usenet.org

Ehm.... he DID mention that.
:-P
Richard.


Perhaps you could indicate exactly in the above quoted thread where
the OP specifically stated that this was *not* for use in a publicly
viewable web site. In my experience people "learn PHP" by building
their first web page.

Good grief charley brown; I didn't say it wasn't for use in accessing a
nuclear reactor, nor for protecting anything, nor anything about a web
site, nor ... ... ... ... ... ... .
What you want and what you're going to get from people are two vastly
different things. I don't get why my playing with different methods of
accomplishing the same things captcha code can would piss you off. You
seem to actually be pissed that someone would use captcha code to learns
some things if they weren't going to use it for catpcha code on a web
site. That's interesting, to say the least.
I can just imagine your response if I hadn't mentioned "captcha" and
just said I was fiddling with this code and then showed it! There are
so many variations on how to create captcha code rectangles that it
makes for a great example of different ways todo things. Something I
suspect you are failing to recognize is that studying how others do
things is a great learning tool. I suppose I'm an "oddball" compared to
you since I actually KNOW what code does and if I don't, I try to learn
it and if I can't, I'll ask what appears to be a better authority then
my manuals etc. to figure it out. A forest is made of many trees; in
this case all you see is one forest, I think.

Cheers,

Twayne
Apr 9 '08 #11

P: n/a
Krustov wrote:
>>They are definitely _not_ a solution.

What do you suggest as a alternative ? .

Here are some nice suggestions
http://www.w3.org/TR/turingtest/

best regards
Piotr

Thanks; I had actually found that site already but I appreciate your
effort in posting it; many others will see it too and that's good. Lots
of good reverences there and also at w3c.

--
Regards,

Twayne

Open Office isn't just for wimps anymore;
OOo is a GREAT MS Office replacement
www.openoffice.org
Apr 9 '08 #12

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