Jnr PHP/Codeigniter Developer

<?php

echo array_sum(explode(',',$input));

?>

The explode function is one of the most used functions in PHP, so it’s important to know if the developer knows this function. There is no unique answer to this question, but the answer must be similar to this one.

Codeigniter’s hooks feature provides a way to change the inner working of the framework without hacking the core files. In other word, hooks allow you to execute a script with a particular path within the Codeigniter. Usually, it is defined in application/config/hooks.php file.

Define what is null coalescing operator ?? which is available in PHP 7.0 and later

The father of PHP.

Within your controller functions, models will typically be loaded; you will use the function

$this->load->model (‘Model_Name’);

Most popular are: CakePHP, CodeIgniter, Yii 2, Symfony, Zend Framework etc.

The PHP split() function splits the string into an array by regular expression.

There are several ways to protect CodeIgniter from CSRF, one way of doing is to use a hidden field in each form on the website. This hidden field is referred as CSRF token; it is nothing but a random value that alters with each HTTP request sent. As soon as it is inserted in the website forms, it gets saved in the user’s session as well. So, when the form is submitted by the users, the website checks whether it is the same as the one saved in the session. If it is same then, the request is legitimate.

In PHP there are three main type of errors:

☛ Notices – Simple, non-critical errors that are occurred during the script execution. An example of a Notice would be accessing an undefined variable.

☛ Warnings – more important errors than Notices, however the scripts continue the execution. An example would be include() a file that does not exist.

☛ Fatal – this type of error causes a termination of the script execution when it occurs. An example of a Fatal error would be accessing a property of a non-existent object or require() a non-existent file.

echo() and print() are functions in PHP, both output strings. Function echo() can take multiple expressions whereas print() cannot. Moreover print() returns true or false based on success or failure whereas echo doesn't.

In HTML, there is no Codeigniter way, as such it is a PHP server side framework. Just use an absolute path to your resources to link images/CSS/JavaScript from a view in CodeIgniter

/css/styles.css

/js/query.php

/img/news/566.gpg

All objects in PHP have Constructor and Destructor methods built-in. The Constructor method is called immediately after a new instance of the class is being created, and it’s used to initialize class properties. The Destructor method takes no parameters.

Understanding these two in PHP means that the candidate knows the very basics of OOP in PHP.

To extend the native input class in CodeIgniter, you have to build a file named application/core/MY_Input.php and declare your class with

Class MY_Input extends CI_Input {

}

Simple answer is using $_SERVER['HTTP_USER_AGENT']. Not so simple is that we need to take into account proxy servers and other situations. In total, this information is defined in 3 $_SERVER variables.

Different types of hook point in Codeigniter includes

☛ post_controller_constructor

☛ pre_controller

☛ post_sytem

☛ pre_system

☛ cache_override

☛ display_override

☛ post_controller

Technology that caches objects in memory and the application can get to them really fast. It is the basis in scaling larger PHP application.

Unlink() deletes the given file from the file system. Where unset() makes a variable undefined from memory.

unset() sets a variable to “undefined” while unlink() deletes a file we pass to it from the file system.

It is not possible to send an Ajax request if the protocol or host are different. This is called CORS and is checked by the browser.

The type of cookie which is stored permanently on the browser. A persistent cookie can be used for tracking long-term information.