CodeIgniter 500 Internal Server Error - php

Question

I downloaded a PHP script written using CodeIgniter. when I run it from the localhost, on going to the admin folder, it shows localhost again. Also when running from my web host, it shows a 500 Internal Server Error.
I run the site from http://localhost/myproj It works. Then when I try to go to the admin page which is at http://localhost/myproj/administrator, it gives a 500 Internal Server Error.
I read here that this might be due to a wrong code in the .htaccess file. This is my present .htaccess file
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)/$ $1 [L,R=301]
RewriteCond %{REQUEST_URI} ^system.*
RewriteRule ^(.*)$ /index.php/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php/$1 [L]
# Without mod_rewrite, route 404's to the front controller
ErrorDocument 404 /index.php
Please help me. I know it might be a very small problem, but I'm unable to find the error.

Answer 1

The problem with 500 errors (with CodeIgniter), with different apache settings, it displays 500 error when there's an error with PHP configuration.
Here's how it can trigger 500 error with CodeIgniter:
Error in script (PHP misconfigurations, missing packages, etc...)
PHP "Fatal Errors"
Please check your apache error logs, there should be some interesting information in there.

Answer 2

Just in case somebody else stumbles across this problem, I inherited an older CodeIgniter project and had a lot of trouble getting it to install.
I wasted a ton of time trying to create a local installation of the site and tried everything. In the end, the solution was simple.
The problem is that older CodeIgniter versions (like 1.7 and below), don't work with PHP 5.3. The solution is to switch to PHP 5.2 or something older.

Answer 3

You're trying to remove index.php from your site URL's, correct?
Try setting your $config['uri_protocol'] to REQUEST_URI instead of AUTO.

Answer 4

Try this to your .htaccess file:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule >

Answer 5

Make sure your root index.php file has the correct permission, its permission must be 0755 or 0644

Answer 6

remove comment in httpd.conf (apache configuration file):
LoadModule rewrite_module modules/mod_rewrite.so

Answer 7

Whenever I run CodeIgniter in a sub directory I set the RewriteBase to it. Try setting it as /myproj/ instead of /.

Answer 8

I know I am late, but this will help someone.
Check if rewrite engine is enabled.
If not, enable rewrite engine and restart server.
sudo a2enmod rewrite
sudo service apache2 restart

Answer 9

if The wampserver Version 2.5 then change apache configuration as
httpd.conf (apache configuration file):
From
#LoadModule rewrite_module modules/mod_rewrite.so**
To ,delete the #
LoadModule rewrite_module modules/mod_rewrite.so**
this working fine to me

Answer 10

Pretty late to the party but, i think the best approach to 500 internal server errors in CodeIgniter would be to enable the error log functionality in the Config.php file in the config folder and set a threshold value i.e. $config['log_threshold'] = 1,2,3,4 depending on the logs you want to view.

Answer 11

This probably isn't relevant any more to this thread, but hopefully helpful to somebody.
I've had 500 errors for the past hour as I had a controller return an array not supported by the php version ran on my (crappy) server. Seems trivial but had the hallmarks of a codeigniter error.
I had to use:
class emck_model extends CI_Model {
public function getTiles(){
return array(...);
}
}
Instead of
class emck_model extends CI_Model {
public function getTiles(){
return [...];
}
}
Cheers

Answer 12

This works fine for me
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule >

Answer 13

If your are using local server, this problem is faced in Wampserver when the essential modules are not enable.
You can Enable them with:
Left click on Wampsever icon
Go to APACHE -> APACHE MODULES
scroll down and find "rewrite_module" and "headers_module"
Then mark them check
It will restart automatically. Done.