Top Zend Interview Questions
Q – 1 Please write down a program to show the execution of the application?
Ans-
– The execution of the program can be done by using the methods of Decorators.
– Decorators provide the methods like errors, htmltag, labels, etc. to help the developers to use it and execute their applications.
– The program is written like this:
$label->render($htmlTag->render($errors->render($viewHelper->render(”))))
Q – 2 Explain what are the default methods provided by decorators?
Ans-
– Decorators are used in the application to provide the functionality and make elements to work.
– The decorators being provided as default are as follows:
– ViewHelper:
is a method that allows the viewing of the helper files used.
It allows the replacement of the content that is being provided.
– Errors:
provide the error codes and messages that came during the execution of the application. It provides appending of the content.
– HTMLTag:
that allows the tags to be written by using the parameters and attributes.
It provides the wrapping up of the content and decreasing the length of the code.
– Labels:
are used to provide the informative keywords as it provides prepending of the content that is being provided.
Q – 3 Do you know what are the elements used in customizing the output of using the standard decorators?
Ans- The elements used by the decorator to be used in the application are as follows:
– ViewHelper:
It allows the replacement of the content that is being provided.
– Errors:
It provides appending of the content.
– HtmlTag :
It provides the wrapping up of the content and decreasing the length of the code.
– Label:
labels are used with the wrapping of the code using the tag
.
The form objects are also involved in it and are as follows:
– FormElements:
are used to iterate the elements, display groups, and sub-forms that are used to render the elements used above.
Q – 4 Tell me what are the basic operations performed by the Decorator?
Ans-
– Decorator provides the ability to append, prepend, and replace the content that is passed to the method.
– The content that is being initially placed provides the empty string and being processed with the decorator.
The operations that can be performed are shown below:
– Append:
this allows the appending of the functions and methods that can be used to build an application.
– Prepend:
this allows the content to be placed at the beginning of the file.
– Replace:
this operation will allow the replacement of the content from any of the content that is present.
Q – 5 Explain what is being presented by the Decorators?
Ans-
– Decorators are used to provide the Zend_Form in the case of developer’s use and provide them the functionality to write the code.
– It determines the display and provides the final output of the input that is being provided by the developer.
– The solution is being managed by the modified decorator and it is used to decorate the object.
– The content can be generated by using the decorate methods and function or using the metadata.
– The metadata is being used with the elements or objects through which the content will be generated.
Q – 6 Do you know what are the methods used in Decorator?
Ans- – The methods used to render the view of the final window are shown as:
$window->render();
– The render view is being executed by the use of WindowScrollbarDecorator::render() method.
– It uses the WindowTitleDecorator::render() method, to be used as the decorator for the title and the rendering of it.
– WindowDecorator::render() method, is used as a Decorator of the window class that allow the main execution of the application.
– The rendering of the window is being done by using the function or method as: Window::render() that allows the simple use of state object.
Q – 7 Tell me what are the steps kept in mind while designing the Zend_Form?
Ans-
– The markups are placed in the proper places with each element and with the use of form.
– The markup should be generated for the displaying of the element and in the form as well.
– Inject the values in the element markup with the metadata to design it more effectively.
– The reporting errors need to be kept in check to see the repetitive task that is being done using the code.
– The form solution is being provided to address the actions and other features that need to be addressed.
Q – 8 How to write a program to show the instantiation of the window class?
Ans-
– The decorator is used to extend the functionality of the class that wraps up the structure.
– The decorator extends the class and its functionality by wrapping up in a defined pattern.
– The use of it allows the user to add or modify the existing behaviour of the API that is same.
– Decorators wrap other that identifies the original object and follows with the same API.
– The WindowDecorator is being created to display the window, by showing scrollbars, window title, etc;
$window = new WindowScrollbarDecorator(
new WindowTitleDecorator(
new WindowDecorator(
new Window()
)
)
);
Q – 9 Can you explain why are in-built libraries used for the web services?
Ans-
– Zend framework is used to solve the development problems of the web applications and it provides resources for use.
– Web services are used for the development environment and to make it accessible to all the platforms.
– Web services are being provided by the zend framework and used in the application development process.
– The users uses the web services to access their work and other services and components.
– It uses the Zend_Registry and Zend_Log methods to have the registry setup and log being maintained while setting up the libraries for the web services.
Q – 10 Do you know what is the function Lucene?
Ans-
– Lucene is an open source binary format used to have features for high performance and provide other tools to manage the resources.
– It provides fully featured text search engine that can be utilized by the applications and be used to execute it.
– It provides the storing of the data and the search indexes by providing the standardized query format for querying for other indexes.
– Lucene is a search engine provider that allows the functionality to be implemented for the indexes.
– Lucene uses the Apache project and having the zend library with the name Zend_Search_Lucene.
Q – 11 How to write a program to retrieve the view object within plugin?
Ans-
– Zend uses the framework that allows easy retrieving of the object within the arbitrary code.
– It uses the action helper and other class methods to view the object within the plugin.
– The method ViewRenderer() is used by default in the zend framework to view and render the components.
$viewRenderer = Zend_Controller_Action_HelperBroker::getStaticHelper(‘viewRenderer’;
$view = $viewRenderer->view;
Q – 12 Explain what is the function of action helper in Zend?
Ans-
– Zend allows the creation of application using the framework that provides MVC architecture.
– The action helper is used to instantiates and store the object i.e Zend_View and other objects that are related to view.
– It also provides ways to inject the instantiation process in different objects by the help of action helper.
– The view object is stored in the view property provided by the action helper and a view instance is created using this.
– ViewRenderer instance is being created using the action helper function and it allows creating sync between all the objects.
Q – 13 How to write a program to show the function of action helper?
Ans-
– Action helper is used to create the application and instantiate the object of it using the Zend_View.
– The object is used and stored using the ViewRenderer’s property that creates an instance and provides more options.
– It includes the dispatch process before any action is being dispatched from the view and the example code is given as:
if (!isset($viewRenderer->view)) {
$viewRenderer->initView();
}
$view = $viewRenderer->view;
Q – 14 Tell me what is the function of model in MVC architecture?
Ans-
– MVC is made up of model, view and controller components to, represents the data in the architectural form.
– The model component can vary from one requirement to another for MVC application.
– The function model represents the application that has the abstract processing of the components.
– It uses the zend framework that defines MVC architecture at one place and allow the applications to use it.
– It is having the model interface, class and other components that used to identify the value and provide the limitations on the use.
Q – 15 Do you know what is the use of Zend framework?
Ans-
– Zend framework is a robust framework that provides the components used by the web applications.
– It provides inbuilt libraries and functions to make the programming and integration easier.
– Zend framework consists of loosely coupled components that can be used to easily integrate in an application.
– It is used for the web application that uses lots of functions and libraries without writing much of the coding.
– It provides tools that can be used to have the standalone component based architecture.
Q – 16 Tell me what are the ways in which the file can be detected as being uploaded or not?
Ans-
– There are certain functions used for the detection of the file and check whether the file is being uploaded properly or not.
– The use of isUploaded() function with the pre-defined parameters are used to check and it returns the boolean result.
– The use of getFileName() method is used to provide the latest releases of the file and returns the NULL.
– The use of getFileInfo() provides a way to make an empty file key that can be used to check whether the file is being uploaded or not.
– The flag is set for the isUploaded() method to false that allow the detection to be made easy.
Q – 17 Can you explain what is the difference between Zend_Auth and Zend_Acl?
Ans-
– Zend_Auth provides the authentication protocol for the users using many methods whereas; Zend_Acl is used for authorization purpose.
– Zend_Auth uses the methods like LDAP, OpenID and HTTP to provide the authentication, whereas Zend_Acl uses Access Control List for authorization.
– Zend_Auth provide the authentication in the form of verifying and providing the credentials for the user’s system, whereas Zend_Acl uses list of roles that is being implemented only those who are authorized to it.
– Zend_Auth provides an environment to the system through which user who is authenticated for use, whereas Zend_Acl performs some operations on the specific resources that need to be written on the system.
– Zend_Auth supports the authentication platforms features, whereas Zend_Acl supports the advanced definitions with features of multiple inheritance and other similar features.
Q – 18 How to write a program that performs the calculations using the SQL function?
Ans-
– The SQL functions are used to perform the calculations of the statements using the Zend_Db_Select command.
– The expression needs to have parentheses and the command that is given as Zend_Db_Select need to provide the statement appropriately.
– The Zend_Db_Expr is used to explicitly create the expressions that are given below:
$select = $db->select()
->from(array(‘p’ => ‘products’),
array(
‘product_id’,
‘cost_plus_tax’ => new Zend_Db_Expr(‘p.cost * 1.08’),
));
Q – 19 Explain what is the procedure to see that the optional file is detected?
Ans-
– There is a use of receive() method that returns true for the file element which is not required.
– The file can be neglected when using the method mentioned above, as soon as the file gets opened it detected.
– The method returns the false in case of any error or the file hasn’t been copied or uploaded directly.
– There are other methods used to provide the detection of the file using the elements in normal HTML file.
– The methods can detect the file and provide the tools to make the file being detected.
Q – 20 Do you know what is the way in which the HTML can be used to form elements?
Ans-
– The form elements can be customized using the decorators and using the Zend_Form for the rendering of the output.
– The description decorator can be used to have an instance running that allow the HTML to create the form elements.
– The turning of escape characters is required for the output of the decorator and it can be represented as shown below:
$element->setDecorators(array(
array(‘ViewHelper’),
array(‘Description’, array(‘escape’, false)),
array(‘Errors’),
array(‘HtmlTag’, array(‘tag’ => ‘dd’)),
array(‘Label’, array(‘tag’ => ‘dt’)),
));
– The element can be set to use the description by adding the extra HTML to this and it can be done using this:
$element->setDescription(‘Hello World‘);