Showing posts with label Interview Questions and Answers. Show all posts
Showing posts with label Interview Questions and Answers. Show all posts

Sunday, 11 February 2018

React JS Interview Questions and Answers for beginner

React JS Interview Questions and Answers for beginner

Question: How to use JavaScript Expressions in reactJS?
To use the expression in reactjs, you need to wrap the expression with with curly brackets {}.
For Example:
{i == 1 ? 'True!' : 'False'}

Question: How to use JavaScript Expressions in reactJS?

class App extends React.Component {
   render() {
      var myStyle = {
         fontSize: 40,
         color: '#FF0000'
      return (
export default App;

Question: What is state in ReactJS?
State is the place where the data comes from.
We should try to make our state simple and minimize the number of stateful components.

class App extends React.Component {
   constructor(props) {
      this.state = {
         header: "This is Header from State",
         content: "This is Content from State"
   render() {
      return (

Question: How to Validating Props?

class App extends React.Component {
   render() {
      return ( 
 Hello, {} </h1>
Your Mobile: {this.props.propNumber}</h3>
Address: {this.props.propString}</h3>
App.propTypes = {
   name: PropTypes.string,
   propNumber: PropTypes.number,
   propString: PropTypes.string,
App.defaultProps = {
   name: 'Dear User',   
   propNumber: 9888888888,
   propString: "#8555, Sector 45D, Chandigarh"

Question: What is difference between setState and forceUpdate() and findDOMNode() in reactJS?
setState() It is used to update the state of the component.It will only add changes to the original state.
forceUpdate() It is used to forceUpdate the state of the component.It will only update to the original state.
findDOMNode() It is used to forceUpdate the state of the component.It will only update to the original state.

Question: Give working example of forceUpdate() in reactJS?

class App extends React.Component {
   constructor() {
      this.forceUpdateHandler = this.forceUpdateHandler.bind(this);
   forceUpdateHandler() {
   render() {
      return (
<button onclick="{this.forceUpdateHandler}">Click to Update</button>
            <br />
Random number: {Math.random()}</h4>

Question: How to use Loop in ReactJS?

var rows = [];
for (var i = 0; i &lt; numrows; i++) {
    rows.push(<objectrow key="{i}">);
return tbody(rows);  </objectrow>

Question: What is meaning of ... in ReactJS?
... is called Spread Attributes.
If you already have props as an object, and you want to pass it in JSX, you can use ... as a "spread" operator to pass the whole props object. For Example:

var parts = ['two', 'three'];
var numbers = ['one',, 'four', 'five'];

Question: How to set focus in reactJS?
You can use componentDidMount for the same.

class App extends React.Component{
  render() {
<input defaultvalue="Won't focus" />
        <input ref="{(input)" /> { this.nameInput = input; }} 
          defaultValue="will focus"

Monday, 8 January 2018

Zend Framework 2 Interview questions and answers for beginners

Zend Framework 2 Interview questions and answers for beginners

Question: What is module in ZF2?
Zend Framework2 uses a module system to organised your main application-specific code within each module.
Module is separated code from main which contain its own controllers, models, forms and views, along with configuration.
File Structure of module are as following

Question: What is Service manager?
The Service Manager is an implementation of the "Service Locator" design pattern.

Keys used for the service manager should be unique across all modules, you can do
this by prepended by the module name in keys.

Service manager configuration files are merged by the module manager.
The service manager lazily instantiate services when they are needed.

Question: How to invoke a class by service manager?
$serviceManager->setInvokableClass('user_mapper', 'User\Mapper\UserMapper');

Question: How to set the routing in Zend Framework2?
In Zend framwork2, routing is set in configuration file of same module.
File path: module.config.php (Full path: \module\Album\config\module.config.php)

Example of Routing in Zend Framework
'router' => array(
    'routes' => array(
        'album' => array(
            'type' => 'segment',
            'options' => array(
                'route' => '/album[/:action][/:id]',
                'constraints' => array(
                    'action' => '[a-zA-Z][a-zA-Z0-9_-]*',
                    'id' => '[0-9]+',
                'defaults' => array(
                    'controller' => 'Album\Controller\Album',
                    'action' => 'index',

Following are the example of URL with above routing.
URL 1 : /album/index (Listing)
URL 2 : /album/add (Add Album)
URL 3 : /album/edit/10 (Edit Album )
URL 4 : /album/delete (Delete Album )

If you try to access url /album/hello, it will try to search helloAction in same controller.

Question: How to connect to mysql database in Zend Framework2?
  1. open global.php(/config/autoload/global.php)
  2. Add following before the "return array" String.
  3. replace the db array with following
         'db' => array(
             'driver'         => 'Pdo',
             'dsn'            => "mysql:dbname={$mysqlDbName};host={$mysqlDbHost}",
             'username' => $mysqlDbUsername,
             'password' => $mysqlDbPassword,         
             'driver_options' => array(
                 PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'UTF8\''

Question: How to protect from Cross Site Scripting (XSS) vulnerabilities?
You need to use a in-built function whenever you print any data to browser.
    $htmlData='Hello World! How are you?';
    echo $this->escapeHtml($htmlData);

Question: How to direct from controller in Zend Framework2?
you can use redirect method for same.

Question: How to permanent Redirect in Zend Framework2?
you can use redirect method for same.

Question: How to temporary redirect in Zend Framework2?
you can use redirect method for same.

Question: How to Change layout from controller in Zend Framework 2.0?
Add Following code in controller.
$this->layout('layout/custom'); //custom.phtml      
File path is : module\{module}\view\layout\custom.phtml Question: How to Change layout for module level in Zend Framework 2?
  1. Open the module.config.php of the module. (path: module\{module}\config\module.config.php)
  2. Add/Update Following code in view_manager array.
            'template_map' => array(
                'layout/layout'           => __DIR__ . '/../view/layout/layout.phtml', //Setup the layout            
                'error/404'               => __DIR__ . '/../view/error/404.phtml',    //Setup the error        

Thursday, 7 September 2017

Shell Scripting Interview Questions and Answer

Shell Scripting Interview Questions and Answer

Question: How to Check if a directory exist?
if [ -d "$DIRECTORY" ]; then
  echo "Directory is found"
  echo "Directory is Not found"

Question: How to concatenate two string variable?
fullStr="$str1 $str2";
echo $fullStr; #Web Technology 

Question: What do you mean by echo file1.txt > file2.txt?
> is used to redirect output.
echo file1.txt > file2.txt

It just redirect the output to file2.txt

Question: What do you means by 2>&1?
0 is stdin
1 is stdout
2 is stderr
>& is the syntax to redirect a stream to another file descriptor

So, Its saying display the error on stdout

Following two do same thing.
echo test 1>&2
echo test >&2

Question: What is scp and why use? Give example?
SCP is used to copy the file/dir from one server to another server.
scp -r [email protected]:/path/to/source /home/user/destination/

Question: What is command to copy a file?
cp file1.txt \another\folder\file1.txt

Question: What is command to move a file?
mv file1.txt \another\folder\file1.txt

Question: How to count number of words in file?
 wc -w file.txt

Question: How to append in file from source file?
 cat sourcefile.txt >> destinationfile.txt
It will add the content in destinationfile.txt from sourcefile.txt

Question: How to search a string and then delete that line?
 sed '/removeTxt/d' ./file
It will remove the line having content removeTxt and print the output to console.

Question: How to set a variable to the output from a command?
 OUTPUT="$(ls -1)"
echo "${OUTPUT}"

Question: How to convert a string in lowercase?
a="Hello World!" 
echo "$a" | tr '[:upper:]' '[:lower:]' #hello world!

Question: What is use of export command?
export command is used to make the available of variable in child process.
export name=test

Now name variable will be accessible in child process.

Question: How to print date in yyyy-mm-dd format?
YYYY-MM-DD format
echo `date +%Y-%m-%d`
echo `date '+%Y-%m-%d %H:%M:%S'`

Question: How to reverse the lines?
tac file1.txt
It will revere the lines and display in console output.

Question: How to redirect output to file?
 ls -l 2>&1 | tee -a errorfile.txt

It will store error and output(both) in error_file.txt

Question: How to determine whether a Linux is 32 bit or 64 bit?
uname -m

x86_64 ==> 64-bit kernel
i686   ==> 32-bit kernel

Question: How to compare two directories?
diff --brief -r dir1/ dir2/
diff -qr -r dir1/ dir2/

Question: When do we need curly braces around shell variables?
When you want to expand the variable (like foo) in the string.
For Example you want to make $foobar.
echo "${foo}bar"

Friday, 7 October 2016

Symfony2 Interview Questions and Answers for Beginners

Symfony2 Interview Questions and Answers for Beginners

Question: What is Symfony?
Symfony is a PHP web application framework for MVC applications.

Question: Is Symfony Open Source?
Yes, It is Open Source.

Question: What is current Stable version of Symfony?
Version: 3.1.0, Dated: 30 May 2016

Question: What is offical website of Symfony?

Question: What is minimum PHP Version requirement for Symfony?
PHP 5.3.9

Question: What are benefits of Symfony?
  1. Fast development
  2. MVC Pattern
  3. Unlimited flexibility
  4. Expandable
  5. Stable and sustainable
  6. Ease of use.

Question: How to concatenate strings in twig?
{{ 'http://' ~ }}

Question: How to get current route in Symfony 2?
$request = $this->container->get('request');
$currentRouteName = $request->get('_route');

Question: How to render a DateTime object in a Twig template?
{{ game.gameDate|date('Y-m-d') }}

Question: How to var_dump variables in twig templates?
{{ dump(user) }}

Question: How to get the request parameters in symfony2?

Question: How to get list of all installed packages in composer?
composer global show

Wednesday, 5 October 2016

FuelPHP Interview Questions and Answers for Beginners

FuelPHP Interview Questions and Answers for Beginners

Question: What is FuelPHP?
FuelPHP is PHP Framework written in PHP based on the HMVC pattern.

Question: Is FuelPHP Open Source?
Yes, It is Open Source.

Question: What is current Stable version of FuelPHP?
Version: 1.8, Dated: April 9, 2016

Question: What is minimum PHP Version required for FulePHP?
PHP 5.4+

Question: Is FulePHP support Multilingual?
Yes, It support Multilingual.

Question: What is offical website of FulePHP?

Question: What are Key Features of FuelPHP?
  1. URL routing system
  2. RESTful implementation
  3. HMVC implementation
  4. Form Data validation
  5. ORM (Object Relational Mapper)
  6. Vulnerability protections like XSS, CSRF, SQL Protection and encode output.
  7. Caching System

Question: What is full form of HMVC?

Question: What is HMVC?
HMVC is an evolution of the MVC pattern.

Question: What are benefits of HMVC?
  1. Modularization
  2. Organization
  3. Reusability
  4. Extendibility

Question: How to get Query in FulePHP?
$userQueryToExecute = Model_Article::query()
        ->where('blocked', '=', 1);

echo $userQueryToExecute->get_query();

Question: How to check that Redis server is running?
    $redis = \Redis::instance();    
catch(\RedisException $e)
    //here error will come

Question: How to use join with condition?
$queryObj = \Services\Model_Org::query()
->related('profile_image')->related( array(  'comments' => array(   'where' => array(    array('visible' , '=' , '0')   )
  ) ))
->where('rating','!=', 'null')

Friday, 29 July 2016

Laravel Interview Questions and Answers

Laravel Interview Questions and Answers

Question: What is Laravel?
Laravel is a open-source PHP framework developed by Taylor Otwell used for Developing the websites.
Laravel helps you create applications using simple, expressive syntax.

Question: What are Advantages of Laravel?
  1. Easy and consistent syntax
  2. Set-up process is easy
  3. customization process is easy
  4. code is always regimented with Laravel

Question: Explain about Laravel Project?
Laravel is one of the most popular PHP frameworks used for Web Development.
This framework is with expressive, elegant syntax.
It is based on model–view–controller (MVC) architectural pattern.

Question: What are the feature of Laravel5.0?
  1. Method injection
  2. Contracts
  3. Route caching
  4. Events object
  5. Multiple file system
  6. Authentication Scaffolding
  7. dotenv – Environmental Detection
  8. Laravel Scheduler

Question: Compare Laravel with Codeigniter?
Laravel Codeigniter
Laravel is a framework with expressive, elegant syntax CodeIgniter is a powerful PHP framework
Development is enjoyable, creative experience Simple and elegant toolkit to create full-featured web applications.
Laravel is built for latest version of PHP Codeigniter is an older more mature framework
It is more object oriented compared to CodeIgniter. It is less object oriented compared to Laravel.
Laravel community is still small, but it is growing very fast. Codeigniter community is large.

Question: What are Bundles,Reverse Routing and The IoC container ?
Bundles: These are small functionality which you may download to add to your web application.
Reverse Routing: This allows you to change your routes and application will update all of the relevant links as per this link.
IoC container: It gives you Control gives you a method for generating new objects and optionally instantiating and referencing singletons.

Question: How to set Database connection in Laravel?
Database configuration file path is : config/database.php
Following are sample of database file
'mysql' => [
    'read' => [
        'host' => 'localhost',
    'write' => [
        'host' => 'localhost'
    'driver'    => 'mysql',
    'database'  => 'database',
    'username'  => 'root',
    'password'  => '',
    'charset'   => 'utf8',
    'collation' => 'utf8_unicode_ci',
    'prefix'    => '',

Question: How to enable the Query Logging?

Question: How to use select query in Laravel?
$users = DB::select('select * from users where city_id = ?', 10);
    foreach($users as $user){


Question: How to use Insert Statement in Laravel?
DB::insert('insert into users (id, name, city_id) values (?, ?)', [1, 'Web technology',10]);

Question: How to use Update Statement in Laravel?
DB::update('update users set city_id = 10 where id = ?', [1015]);

Question: How to use Update Statement in Laravel?
DB::update('update users set city_id = 10 where id = ?', [1015]);

Question: How to use delete Statement in Laravel?
DB::delete('delete from  users where id = ?', [1015]);

Question: Does Laravel support caching?
Yes, Its provides.

Monday, 11 April 2016

YII interview questions and answers for fresher

yii interview questions and answers for fresher

Question: What is Yii?
Yii is a PHP framework which is based on MVC (Model View Controller).

Question: Is it opensource?
Yes, It is opensource. Download and use as per your project requirement. Question: What is full form of Yii
Yes it is.

Question: In which language, It is written?

Question: What is current stable version of Yii?
Version: 2.0.7 dated February 14, 2016.

Question: What is offical website of Yii Framework?

Question: From where i an download Yii Framework?

Question: How to start Yii?

Question: What are main feature of Yii framework?
  1. MVC design pattern
  2. Web Service available for Apps like android
  3. Internationalization and localization translation for multilingual.
  4. Caching for speed up the application
  5. Error handling and logging for tracking
  6. cross-site scripting (XSS), cross-site request forgery (CSRF) protection
  7. PHPUnit and Selenium for testing.
  8. Automatic code generation help us to fast development.

Question: How to set default controller on Yii?
    'name'=>'Yii Framework',

Question: How to get current controller id?
echo Yii::app()->controller->id;

Question: How to get current action id?
echo Yii::app()->action->id;

Question: What is the first function that gets loaded from a controller? ?

Question: How can we use ajax in Yii?
use ajax helper

Question: What are two type of models in YII
  1. Form models
  2. active records

Question: What are active records model?
Active Record is a design pattern used to abstract database access in an object-oriented way.
active records model is based on this design pattern.

Question: How to define a form model?
class MyLoginForm extends CFormModel
    public $username;
    public $password;
    public $rememberMe=false;

Question: How to set validation in Form Model?
class MyLoginForm extends CFormModel
    public $username;
    public $password;
    public $rememberMe=false; 
    private $_identity;
    public function rules()
        return array(
            array('username, password', 'required'),
            array('rememberMe', 'boolean'),
            array('password', 'authenticate'),
    public function authenticate($attribute,$params)
        $this->_identity=new UserIdentity($this->username,$this->password);
            $this->addError('password','username or password Incorrect .');

Question: What are the core application components available on Yii?
  1. db- database connection.
  2. assetManager - manage the publishing of private asset files
  3. authManager - manage role-based access control
  4. cache- manage caching functionality
  5. clientScript- manage javascript and CSS
  6. coreMessages- provides translated core messages
  7. errorHandler- manage errors handling.
  8. themeManager- Manage themes
  9. urlManager- URL parsing and creation functionality
  10. statePersister- mechanism for persisting global state
  11. session- Session management
  12. securityManager- Security Managment

Monday, 25 January 2016

Python Interview Questions and Answers for Freshers

Python Interview Questions and Answers for Freshers

Question: What is current Stable version of Python?

Version: 3.5.1 Dated: 7 December 2015

Question: What is Filename extension of Python?
py, .pyc, .pyd, .pyo, pyw, .pyz

Question: What is offical website of Python?

Question: What is the difference between deep copy and shallow copy?
  1. Shallow copy is used when a new instance type gets created and it keeps the values that are copied.
    Deep copy is used to store the values that are already copied.
  2. Shallow copy is used to copy the reference pointers just like it copies the values.
  3. Shallow copy allows faster execution of the program whereas deep copy makes slow.

Question: How to use ternary operators?
[on_true] if [expression] else [on_false]
x, y = 25, 50
big = x if x < y else y

Question: What are different data-type in Python?
  1. Numbers
  2. Strings
  3. Strings
  4. List
  5. Dictionaries
  6. Sets

Question: What is module in python?
Module is set of related functionalities. Each python program file is a module, which imports other modules to use names they define using object.attribute notation.

Question: What is lambda in python?
lamda is a single expression anonymous function often used as inline function.

Question: How to validate Email Address in python?"[0-9a-zA-Z.][email protected][a-zA-Z]+\.(com|co\.in)$","[email protected]")

Question: What is pass in Python?
pass is no-operation Python statement and used to indicate nothing to be done.

Question: What is iterators?
iterators is used iterate over a group of elements, containers, like list

Question: What is slicing in Python?
Slicing is a mechanism to select a range of items from Sequence types like strings, list, tuple, etc.

Question: What is docstring in Python?
Python documentation string is a way of documenting Python modules, functions, classes. PEP 257 standardize the high-level structure of docstrings.

Question: Name few modules that are included in python by default?
  1. datetime
  2. re (regular expressions)
  3. string
  4. itertools
  5. ctypes
  6. email
  7. xml
  8. logging
  9. os
  10. subprocess

Question: What is list comprehension?
Creating a list by doing some operation over data that can be accessed using an iterator.
>>>[ord(i) for i in string.ascii_uppercase]
     [65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90]

Question: What is map?
MAP executes the function given as the first argument on all the elements of the iterable given as the second argument.

Question: What is the difference between a tuple and a list?
A tuple is immutable i.e. can not be changed. It can be operated on only.
List is mutable. Changes can be done internally to it.

Question: How to Remove white spaces from string?
filter(lambda x: x != ' ', s)

Thursday, 7 January 2016

OOP Interview Questions and Answers

OOP Interview Questions and Answers

What is Object Oriented Programming?
Object-oriented programming (OOP) is a programming language model organized around objects rather than actions;
Objects are instances of classes, are used to interact with one another.

Following are few examples of object-oriented programming languages
PHP, C++, Objective-C, Smalltalk, C#, Perl, Python, Ruby.

The goals of object-oriented programming are:
  1. Increased understanding.
  2. Ease of maintenance.
  3. Ease of evolution.

What is data modeling?
In class, we create multiple get/set function to get and set the data through the protected functions known as Data Modeling.
class dataModel {    
    public function __set( $key, $value ) {
        $this->$key = $value;
Following are the benefits of Data Modeling
  1. It is very fast.
  2. Smart way to  manipulation on data
  3. No extra layer of logic 
  4. Really flexible to be modeled per need 
  5. Setters can explicitly define what data can be loaded into the object

What is difference between class and interface?
1) Interfaces do not contain business logic
2)You must extend interface to use.
3) You can't create object of interface.

How Session - cookie works in PHP?
When a website open in new client machine(Browser), new sessionId is created and stored in php server and in client machine (In cookie).
All data is store in PHP Server and cookie only have sessionId. When client send sessionId with request to the server, then server fetch the data corresponsing to that sessionId and retun to the browser.

What are some of the big changes PHP has gone through in the past few years?
5.1 added PDO
5.3 - added namespace support

What is Polymorphism?
It is simply "One thing, can use in different forms"
For example, One car (class) can extend two classes (hond & Alta)

How to load classes in PHP.
We can load a class with the use of "autoload" class.
If we want to change from default function autoload to testautload function.
we can do this with "spl_autoload_register"

How to call parent constructor?

Are Parent constructors called implicitly when create an object of class?
No, Parent constructors are not called implicitly It must call this explicitly. But If Child constructors is missing then parent constructor called implicitly.

What happen, If constructor is defined as private OR protected.
If constructor declared as private, PHP through the following fatal error when create object. Fatal error: Call to private BaseClass::__construct() from invalid context in. If constructor declared as private, PHP through the following fatal error when create object. Fatal error: Call to protected BaseClass::__construct() from invalid context in

What happen, If New-Style constructor & old-style constructor are defined. Which one will be called.
New-Style constructor will called. But if New-Style constructor is missing, old style constructor will called.

What are different visibility of method/property?
There are 3 types of visibility of method & property and are following
Public: Can be accessed from same class method, child class and from outside of class.
Protected : Can be accessed from same class method, child class.
Private: Can be accessed from same class method only.
class TestClass
    public $public = 'Public';
    protected $protected = 'Protected';
    private $private = 'Private';

    function printValue()
        echo $this->public;
        echo $this->protected;
        echo $this->private;

$obj = new TestClass();
echo $obj->public; // Works
echo $obj->protected; // Fatal error: Cannot access protected property TestClass::$protected in
echo $obj->private; // Fatal error: Cannot access private property TestClass::$private in C:\wamp\www\arun\class\class.php on line 20
$obj->printValue(); // Shows Public, Protected and Private 

What is Scope Resolution Operator?
The Scope Resolution Operator (also called Paamayim Nekudotayim) is double colon that allows access to static, constant, and overridden properties or methods of a class. Following are different uses Access to static
Acess the constant
Access the overridden properties of parent class
Access the overridden methods of a parent class

What is Static Keyword in PHP?
  • If we declare a Method or Class Property as static, then we can access that without use of instantiation of the class.
  • Static Method are faster than Normal method.
  • $this is not available within Static Method.
  • Static properties cannot be accessed through the object(i.e arrow operator)
  • Calling non-static methods with Scope Resolution operator, generates an E_STRICT level warning.
  • Static properties may only be initialized using a literal or constant value.
  • Static properties/Normal properties Can't be initialized using expressions value.

class StaticClass
    public static $staticValue = 'foo';

    public function staticValue() {
        return self::$my_static;
echo StaticClass::$staticValue;

What is Abstraction in PHP?
  • Abstraction are defined using the keyword abstract .
  • PHP 5 introduces abstract classes and methods. Classes defined as abstract may not be instantiated (create object).
  • To extend the Abstract class, extends operator is used.
  • You can inherit only one abstract class at one time extending.
  • Any class that contains one abstract method must also be declare as abstract. Methods defined as abstract simply declare the method's signature, they can't define the implementation.
  • All methods marked as abstract in the parent's class, declaration must be defined by the child.
  • additionally, these methods must be defined with the same (or a less restricted) visibility (Public,Protected & private).
  • Type hint & number of parameter must be match between parent & child class.

What is Interface in PHP?
  • Interfaces are defined using the interface keyword.
  • All methods declared in an interface must be public. Classes defined as Interface may not be instantiated(create object).
  • To extend the interface class, implements operator is used.
  • You can inherit number of interface class at the time of extending and number of abstract class separated by comma.
  • All methods in the interface must be implemented within a child class; failure to do so will result in a fatal error.
  • Interfaces can be extended like classes using the extends operator.
  • The class implementing the interface must use the exact same method signatures as are defined in the interface. Not doing so will result in a fatal error.
  • Type hint & number of parameter must be match.

What is Traits in PHP?
  1. Traits are a mechanism for code reuse in single inheritance.
  2. A Trait is similar to a class, but only intended to group functionality in a fine-grained and consistent way. 
  3. It is not possible to instantiate a Trait but addition to traditional inheritance. It is intended to reduce some limitations of single inheritance to reuse sets of methods freely in several independent classes living in different class hierarchies.
  4. Multiple Traits can be inserted into a class by listing them in the use statement, separated by commas(,).
  5. If two Traits insert a method with the same name, a fatal error is produced.

    Example of Traits
class BaseClass{
    function getReturnType() {
        return 'BaseClass';
trait traitSample {
    function getReturnType() {
        echo "TraitSample:";

class Class1 extends BaseClass {
    use traitSample;   

$obj1 = new Class1();

What is Overloading?
It is dynamically create method / properties and performed by magic methods. Overloading method / properties are invoked when interacting with properties or methods that have not been declared or are not visible in the current scope, Means we you are calling a function which is not exist. None of the arguments of these magic methods can be passed by reference.
In PHP, Overloading is possible

What is Object Iteration?
PHP provides a way for objects to be iterate through a list of items, for this we can use foreach. Only visible properties will be listed.
class TestClass{
    public $public='PublicVal';
    protected $protected='ProtectedVal';
    private $private='PrivateVal';
    function myfunc() {
        return 'func';
    function iterateVisible(){
        foreach($this as $key => $value) {
           print "$key => $value\n";

$obj=new TestClass();

What is Final Keyword in PHP?
PHP introduces the final keyword, which prevents child classes from overriding a method by prefixing the definition with final.
If the class itself is being defined final then it cannot be extended. If the function itself is being defined final then it cannot be extended.

What is Serialize function in php?
It return string containing a byte-stream representation of any value that can be stored in PHP.

Comparing Objects?
When using the comparison operator (==), object variables are compared in a simple manner, namely: Two object instances are equal if they have the same attributes and values, and are instances of the same class.
When using the identity operator (===), object variables are identical if and only if they refer to the same instance of the same class

What is UML?
UML stands for Unified Modeling Language.
You can do following things with UML
  • Manage project complexity.
  • create database schema.
  • Produce reports.

What are Properties of Object Oriented Systems?
  • Inheritance
  • Encapsulation of data
  • Extensibility of existing data types and classes
  • Support for complex data types
  • Aggregation
  • Association 

Friday, 1 January 2016

jQuery Mobile interview questions and answers

jQuery mobile interview questions and answers

jQuery Mobile is a UI framework which is written in javaScript language and used for creating mobile web applications. It works on all popular smartphones and tablets. jQuery Mobile uses HTML5 & CSS3.

What is Initial release of JQuery Mobile?
October 16, 2010

Question: What is Latest version of jQuery Mobile?
Version: 1.4.5
Dated: October 31, 2014

Question: In which language, jQuery mobile is written?

Question: Where it is used?
It is "Mobile application framework" which is used for creating mobile web applications.

Question: What is offical website of jQuery Mobile?

Question: What are Features of jQuery Mobile?
  • Compatible with all major desktop browsers as well as all major mobile platforms (Android, iOS, Windows Phone, Blackberry, WebOS, Symbian)
  • Built on top of jQuery core.
  • Lightweight to optimize speed.
  • The same underlying codebase will automatically scale to any screen.
  • HTML5-driven.
  • AJAX-powered navigation with animated page.
  • UI widgets

Question: Why Use jQuery Mobile?
1. Write Less, Do more
2. Its works on Android, Blackberry, iOS and Iphone
3. Its optimized

Question: Describe few HTML tags used in jQuery Mobile?
data-role="page": Page displayed in the browser.
data-role="header": Creates a toolbar at the top of the page.
data-role="main": Content of the page, like text, images, buttons and forms etc.
"ui-content": Adds extra padding and margin inside the page content
data-role="footer": creates a toolbar at the bottom of the page

Question: How to Add Back Button?
<a class="ui-btn" data-rel="back" href="">Go Back</a>

Question: What is jQuery Mobile Themeing?
jQuery Mobile provides a powerful theming that allows developers to customize color schemes & CSS aspects of UI features.