Most Essential And Frequently Asked Interview Questions And Answer
In codeigniter, we need to load URL helper in controller and then use base_url() function to load the resources.
The config set_item() & item() functions are work for SET and GET a config variable in codeigniterView Detials
Helper is simply a collection of function in a particular category which help you with tasks. The helper file can be loaded in controller constructor, some specific function or in application/config/autoload.php file
Adding helper in controller:
Both php.ini and .htaccess file is configuration file.
It is a configuration file for php setting. It is a special file by which you can make changes in PHP settings. php.ini file provide many setting such as changing of the default max_execution_time = 30, error_reporting = E_ALL & ~E_NOTICE, file_uploads = [on/off] etc.
It is configuration file for server setting. With the help of .htaccess file you can make changes in server settings. It is supported by several web servers, including the popular Apache software which is used by most commercial web hosting providers. These files were first used to control user access on per-directory basis. It is used to control a couple of things such as error handling, enabling ssl, ip blocking and ip whitelisting, url redirect and url rewriting etc.
Following Databases are supported by Codeigniter Frameworks:
|Database Name||Drivers to support Codeigniter|
|MySQL||MySQL (deprecated), MYSQLI and PDO drivers|
|Oracle||oci8 and PDO drivers|
|PostgreSQL||Postgre and PDO drivers|
|MS SQL||MsSQL, Sqlsrv (version 2005 and above only) and PDO drivers|
|SQLite||SQLite (version 2), sqlite3 (version 3) and PDO drivers|
|CUBRID||Cubridand PDO drivers|
|Interbase/Firebird||iBase and PDO drivers|
ODBC and PDO drivers
(you should know that ODBC is actually an abstraction layer)
There are three message types in Codeigniter:
|Error Messages||These are actual errors, such as PHP errors or user errors.|
|Debug Messages||These are messages that assist in debugging. For example, if a class has been initialized, you could log this as debugging info.|
|Informational Messages.||These are the lowest priority messages, simply giving information regarding some process.|
Cross-site scripting (XSS) is a type of computer security vulnerability typically found in web applications. XSS enables attackers to inject client-side script into web pages viewed by other users. A cross-site scripting vulnerability may be used by attackers to bypass access controls such as the same-origin policy.