CodeIgniter image_lib bug in the image process loop

This bug has me scratch my head for hours and finally found the solutions to fix it.

In CodeIgniter, you can upload multiple images and do resize, crop and watermark stuff. It's cool that you can use one library to do many awesome stuff. However there is problem when using image_lib in the loop.

Problem:

I upload few image and want to loop through each one of them and resize them differently based on their original size. So I put the resize function in the loop. However, the dimension is based on the previous image.

For example. the first image is resized to 100x200. The second image should be resize to 50x100, but is resized to 100x200. The third one should be resized to 400x300, but is resized to 100x75.

In other words, the second image was resized using the dimension from the previous resized image based on the second image's longer side (W or H). The first image was resized to 100x200, so the second image was resized to 100x200 because the original dimension of the second image was 50x100 (Height is larger than width). So it take the first image's height to resize the second images. Crap!

Solutions:

In the image_lib in CodeIgniter, there is a function to clean the setting ($config). However, there is missing parameters in the function.

So I add two lines in the function clear().

$this->width = '';
$this->height = '';

Add the above two lines before closing the function.

Problem solved!

CodeIgniter Cache Issues

Well! This is actually not an issues of CodeIgniter cache system. It's how I wrongly use the cache function.

Whenever you use db->cache_on() function to cache the current query. It will cache all the executed queries from this point for the rest of queries in the whole PHP page.

In other words, it will cache everything query that do not have db->cache_off(). WOW! What a big mistake.

So if you just want to cache the current query execution, remember to put db->cache_off() after executing the query. Always remember that!

for example:

$this->pf_db->db->cache_on();
$result = $this->pf_db->db->query($query);
$this->pf_db->db->cache_off();

Without the cache_off(), all the queries after this one will be cached!

CodeIgniter Issues with .htaccess to display No input file specified. error

When running CodeIgniter on Apache 2.2 with PHP5, it display the following error when access url.

No input file specified.

System state:
Apache 2.2
PHP5.2 running as CGI mode with cgi.fix_pathinfo=1 according to PHPINFO().

Problems:
This problem is primary due to running PHP in CGI mode on Apache.

There are two solutions. No matter which one you choose, you will always have the same step 1.

Step 1: Obviously, PHP running under CGI mode has cgi.fix_pathinfo default to 1. Simpley open the /system/application/config/config.php file and make sure the following two options are set.

$config['index_page'] = "";

$config['uri_protocol'] = "AUTO";

Solutions 1:
Step 2: Create a customized PHP.INI file under the root directory of your site with the following line.

cgi.fix_pathinfo = 0;

Solutions 2:
Step 2: Go to .htaccess file and add question mark after index.php and before slash.

RewriteEngine On
RewriteCond %{REQUEST_URI} ^/system.*
RewriteRule ^(.*)$ index.php?/$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)$ index.php?/$1 [L]

Personally, I choose the Solution 1 with PHP.INI. It seems to run faster.

Problem solved!