Re: [PHP] array_search function bugged? update
On 27/03/06, je killen [EMAIL PROTECTED] wrote:
Hi all
Here is an update on my problem reported with the array_search function.
to those who directed me to the bug report page, thanks.
There are a number of reports specific to this function. Maybe event
someone else has written a fix.
here is my solution to my problem.
There are no open bug reports for array_search(). Loads of bogus ones though.
array_search() also completely the wrong tool for the job - the code
you posted is much more complicated and slower than it needs to be.
That whole palaver that you go through to produce $reduced could be
replaced with:
$reduced = array_merge(array(), array_unique($str));
That nested loop you use to produce $final would be rather simpler and
faster if you just flipped $reduced and used a hash lookup.
$charmap = array_flip($reduced);
foreach ($str as $char) { $final[] = $charmap[$char]; }
-robin
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Re: [PHP] array_search function bugged?
On Mon, March 20, 2006 8:35 pm, je killen wrote:
I really don't understand, though, why you are doing things the way
you describe...
I only want one image file for each distinct letter, no repeats
because
I can't put two or more files with the same name
in the same dir. The images need to be drug around DHTML style and
reassembled into the correct word. Javascript
needs to be able to establish when the chars are in the correct order
so I need to have php feed it a formula to refer to.
Okay, now we are getting somewhere!
The easiest way to meet the unique filename requirement is to name
each file after its letter:
a.png
b.png
c.png
Of course, they only need to APPEAR that way to the browser and
Javascript.
In reality, you may not actually have a file named a.png at all.
For example, if your HTML is like this:
img src=/drawchar.php/a.png /
And you have a PHP script drawchar.php like this:
?php
//EG: $path_info will be /a.png,
//because that is what is in tha URL AFTER the PHP script name
$path_info = $_SERVER['PATH_INFO'];
//get JUST the one letter
$char = substr($path_info, 1, 1);
//Create the image:
$image = imagecreatetruecolor(40, 10);
//Boring colors, but works for now:
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);
//make the background white:
imagefilledrectangle($image, 0, 0, 39, 9, $white);
//draw the character:
$font = 3; //Fonts can be 1 through 5
$x = 2;
$y = 38;
imagechar($image, $font, $x, $y, $char, $black);
//Find out how big the image is:
ob_start();
imagepng($image);
$image_raw = ob_get_contents();
ob_end_clean();
$image_length = strlen($image_raw);
//Send suitable headers:
header(Content-type: image/png);
header(Content-length: $image_length);
//Send the data:
echo $image_raw;
?
You can now just pass the word 'dissatisfaction' around, and use PHP
or JavaScript to output individual images.
I'll do it in PHP:
?php
$word = 'dissatisfaction';
for ($i = 0, $len = strlen($word); $i $len; $i++){
$char = $word[$i]; //or use substr if you like
echo img src=\/drawchar.php/$char.png\ /;
}
?
I haven't run this code to test it, so there might be a typo, but it's
going to be MUCH easier to maintain than what you've got going...
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Re: [PHP] array_search function bugged?
On Mon, March 20, 2006 8:47 pm, je killen wrote: I am using simple for loops. If I create and populate an array and test it with a print statement in a for loop, it prints out all the current values. It I again call it to print in a for loop in subsequent code it has exhibited a degraded state. Show us source code that does this. You've made a mistake in your code. Most likely you've altered the array without realizing it, or your variables in your for() loops are mixed up. Easy to do as a beginner. However, if your familiar with FreeBSD, it has a ports and packages mechanism for installing software. I had difficulty with it when installing Apache so I bypassed it and installed Apache from source just according to the install There is simply no way this is your cause. -- Like Music? http://l-i-e.com/artists.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] array_search function bugged?
Richard Lynch wrote:
On Mon, March 20, 2006 8:35 pm, je killen wrote:
I really don't understand, though, why you are doing things the way
you describe...
I only want one image file for each distinct letter, no repeats
because
I can't put two or more files with the same name
in the same dir. The images need to be drug around DHTML style and
reassembled into the correct word. Javascript
needs to be able to establish when the chars are in the correct order
so I need to have php feed it a formula to refer to.
Okay, now we are getting somewhere!
The easiest way to meet the unique filename requirement is to name
each file after its letter:
a.png
b.png
c.png
Of course, they only need to APPEAR that way to the browser and
Javascript.
In reality, you may not actually have a file named a.png at all.
For example, if your HTML is like this:
img src=/drawchar.php/a.png /
And you have a PHP script drawchar.php like this:
?php
//EG: $path_info will be /a.png,
//because that is what is in tha URL AFTER the PHP script name
$path_info = $_SERVER['PATH_INFO'];
//get JUST the one letter
$char = substr($path_info, 1, 1);
//Create the image:
$image = imagecreatetruecolor(40, 10);
//Boring colors, but works for now:
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);
//make the background white:
imagefilledrectangle($image, 0, 0, 39, 9, $white);
//draw the character:
$font = 3; //Fonts can be 1 through 5
$x = 2;
$y = 38;
imagechar($image, $font, $x, $y, $char, $black);
//Find out how big the image is:
ob_start();
At this point, could you have an switch statement that checked the
extension that you sent in the url and make it run the corresponding
imagepng(), imagejpg(), and imagegif() ?
imagepng($image);
$image_raw = ob_get_contents();
ob_end_clean();
$image_length = strlen($image_raw);
//Send suitable headers:
and then here send the corresponding header too.
Just a thought about making it even more universal.
jl
header(Content-type: image/png);
header(Content-length: $image_length);
//Send the data:
echo $image_raw;
?
You can now just pass the word 'dissatisfaction' around, and use PHP
or JavaScript to output individual images.
I'll do it in PHP:
?php
$word = 'dissatisfaction';
for ($i = 0, $len = strlen($word); $i $len; $i++){
$char = $word[$i]; //or use substr if you like
echo img src=\/drawchar.php/$char.png\ /;
}
?
I haven't run this code to test it, so there might be a typo, but it's
going to be MUCH easier to maintain than what you've got going...
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Re: [PHP] array_search function bugged?
On Sun, March 19, 2006 4:46 pm, je killen wrote:
The following code does not produce the correct results (for my
purposes):
function code($str, $match, $formula)
{
for($i = 0; $i count($str); $i++)
{
$formula[$i] = array_search($str[$i], $str);// ==|| no bueno
//print $formula[$i]; not right
if($formula[$i] $i)
{$str[$i] = '';}
}
//print'br'; //- etc (lots more code)---
The code takes a string of ascii letters forming a word and is
supposed
to create a list of indexes
in the proper sequence for reconstructing the word. The object of the
code in context is to take
any word and create an array of unique letters with no repeats so that
gd can be used to produce
images of each letter.
Almost for sure, this function could be used instead:
http://www.php.net/manual/en/function.count-chars.php
You'll be throwing away the information about how many of each letter.
I really don't understand, though, why you are doing things the way
you describe...
The letters are then reassembled in the browser
to form the word. The
$formula above is supposed to tell the browser in what sequence to
display each letter, including
using the same letter image in repeat locations. For this it fails
miserably.
These are the results of test steps:
dissatisfaction (the test word)
Processed input string: dissatisfaction (code output at key step to
verify)
at creation of formula:012245128410511314 (formula sampled at ' no
bueno' line in code)
from browser source array:012245128410511314 (formula pasted from
browser javascript source)
The letter images spell out:
disstfisntidfiiait which is in accordance with the formula as far as
I
can tell.
How do you distinguish in:
012245128410511314
between one-digit and two-digit integers?
dissatisfaction
1
012345678901234
0-d
1-i
2-s
3-NULL (2 is 's')
4-a
5-t
6-NULL (1 is 'i')
7-NULL (2 is 's')
8-f
9-NULL (4 is 'a')
10-c
11-NULL (5 is 't')
12-NULL (1 is 'i')
13-o
14-n
Going from just the numbers, now I get:
012245128410511314
dissatisfaidtiiNULLia
So, given the input 012245128410511314, you are never going to get the
original word back from just that...
I don't think your formula makes sense in the first place...
If you just want to represent each character as a GD image, and not
duplicate, so the browser can cache images, you can just do:
?php
for ($i = 0, $len = strlen($word); $i $len; $i++){
$char = $string[$i];
?img src=drawchar.php/char=?php echo $char? /?php
}
?
You can then use $_SYSTEM['PATH_INFO'] (or whatever it's called) to
get 'char=?' and do like:
list($key, $value) = explode('=', $_SYSTEM['PATHINFO']);
$$key = $value;
There is one other weakness I've discovered, if arrays are created in
one code sequence and are called
to print in loops more than once or processed in different code
sections. The second time the same array
is called it has significantly degraded, loosing values from index
positions.
If you are using list/each or something like that, there is an
internal pointer in the array which you are mucking with, and most
likely confusing yourself with.
Try using 'foreach' which does not use that internal pointer.
the seems to be no bug report accommodation in the php.net site so I'm
posting here.
Posting here FIRST is good, especially since you have not encountered
an actual bug yet :-)
After that, though, there *IS* a place to search for, and ultimately
report bugs:
http://bugs.php.net
But please don't clog that with reports before checking them out
thoroughly, so you really ARE reporting bugs in PHP.
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Re: [PHP] array_search function bugged?
On 19 Mar 2006, at 22:46, je killen wrote: The code takes a string of ascii letters forming a word and is supposed to create a list of indexes in the proper sequence for reconstructing the word. The object of the code in context is to take Ignoring your code (and the supposed 'bug') for a second - why don't you just use the count_chars() function? After all, it is designed to do almost exactly what you are trying to recreate here. http://uk2.php.net/manual/en/function.count-chars.php the seems to be no bug report accommodation in the php.net site so I'm posting here. I'm not sure you looked very hard. There is a link that says 'reporting bugs' in the top nav, which takes you here: http:// bugs.php.net/ Cheers, Rich -- http://www.corephp.co.uk Zend Certified Engineer PHP Development Services -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
