Codeigniter Interview Questions.

Codeigniter is a php MVC Framework.

Die() first terminate the script and then print message. Exit() first print message and then terminate the script. if you comment to die() statement then exit also print

In CodeIgniter, the way PHP files served is different rather than accessing it directly from the browser. This process is called routing. Routing in CodeIgniter gives you freedom to customize the default URL pattern to use our own URL pattern according to the requirement. So, whenever there is a request made and matches our URL pattern, it will automatically direct to the specified controller and function.

* It is free to use as for open source framework. * CodeIgniter is Fast. It is faster than any other framework in php. * It is extremely light weighted. * Excellent documentation * CodeIgniter Uses MVC (Model View Controller) which allows great separation between logic and presentation.

$this->config->item('variableName');

Go To: application/config/config.php and set
$config['csrf_protection'] = TRUE;

$this->load->model('ModelName');

$this->session->unsetuserdata('SessionVariableName');

$this->db->insert_id();

For CodeIgniter, inhibitor is an error handler class, using the native PHP functions like set_exception_handler, set_error_handler, register_shutdown_function to handle parse errors, exceptions, and fatal errors.

$this->db->last_query();

$this->load->helper('helperName');

$this->load->library('LibName');

$this->load->database();

* post_controller_constructor * pre_controller * pre_sytem * post_sytem * cache_override * display_override * post_controller

Message Digest :- A message-digest algorithm is also called a hash function or a cryptographic hash function.
It accepts a message as input and generates a fixed-length output, which is generally less than the length of the input message. The output is called a hash value, a fingerprint or a message digest.
Message Digest 5 (MD5) processes the input text in 512-bit blocks. These blocks are further divided into 16 32-bit sub-blocks.
MD5 is a 128-bit hash.
The MD5 algorithm is intended for digital signature applications, where a large a file must be “compressed” in a secure manner before being en private key under a public-key cryptosystem such as RSA.

// $parameters = $this->input->get();
$this->load->helper('url');


$currentURL = current_url();
$params = $_SERVER['QUERY_STRING'];


$fullURL = $currentURL . '?' . $params;
print_r($fullURL);

$ip = $this->input->ip_address();

print_r($ip);

<?php


function getClientIp() {
$ipAddress = '';
if (isset($_SERVER['HTTP_CLIENT_IP'])){
$ipAddress = $_SERVER['HTTP_CLIENT_IP'];
} else if(isset($_SERVER['REMOTE_ADDR'])){
$ipAddress = $_SERVER['REMOTE_ADDR'];
}else{
$ipAddress = 'UnKnown';
}
return $ipAddress;
}


echo getClientIp();
?>