Codeigniter: URI you submitted has disallowed characters

change in config.php file

$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-\=';

and

$config['enable_query_strings'] = TRUE;

It works for me. Try it yourself!

In CI open directory at project-folder-name/application/config/config.php and configure the variable $config['permitted_uri_chars']:

$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-@\=';

This will work for all special characters

In /project-folder-name/application/config/config.php configure this variable:

$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-@\=';

it also works for @ character

first of all you have to encode your id that is pass in url, then in controller you have to decode the id. view:

<a href="<?php echo base_url()?>Cinvoice/imei_invoice/<?php echo base64_encode($invoice_list['invoice_id']); ?>" class="btn btn-danger btn-sm" data-toggle="tooltip" data-placement="left" title="Final Invoice By Ware House">Primary Order</a>

Controller:

when you call fuction that is in library

$content = $CI->linvoice->get_imei(base64_decode($invoice_id));