• Code is shortened by using Traits.
• One code is used everywhere just by writing the trait function.

Example :

Output:

Multi traits use example:

Output:

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• Late static binding helps to override name by using static in echo keyword.
• It helps lot for writing minimum coding.
• The message of the base class is printed using the self keyword and the message of the derived class is printed using the static keyword.

Example to printing the message of base class:

Output:

Example of printing the message of derived class:

Output:

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• Static properties and methods can be used without creating an instance of the class.
• The static keyword is used to declare properties and methods of a class as static.
• Object not create.
• Stack keyword use before access modifier.
• Inside class use self::(use static method).
• inherit use parent class name ::(properties).

Example :

Example Constructor :-

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• Interfaces help us to use multiple classes in a single class inherit.
• Interfaces are declared with the interface keyword.
• Derived class is called derived class.
• object not be created in interface.
• Property should not be defined in interface(class).
• All interface methods must be public.
• All methods in an interface are abstract.
• To implement an interface, a class must use the implements keyword.

Example :-

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• when we create abstract class then we can not create object of that abstract class.
• If we want to use abstract class then we only access with derived class .
• Just abstract write before the class name.
• when we create abstract class two condition occurs one is abstract method like :- abstract protected function name ( );
• abstract means incomplete method we declare but not implement (code).
• In derived class we have to implement of that abstract method.

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• Same properties on both classes (base and derived class).

Overriding Methods :

• Same name of method on both classes base or derived class.

The post PHP OOP : Overriding properties and Methods appeared first on scmGalaxy.

Restrictions on properties and methods.

Types of access modifier

1. public
2. protected
3. private

Public :

• Access on base as well as derived class and outside of the class.
• Everyone can see and access the data.
• Not secure.
• Override use.

Protected :

• Base and Derived class.
• No one gets access throughout the class.
• Declare like protected property and method.
• Not use override function.
• Without permission no one can access any of these (properties & method).

Private :

• Access itself.
• Highly secured.
• No one can access without permission.
• Highly costly.

The post PHP OOP : Access Modifier (public, protected, private) appeared first on scmGalaxy.

• Inheritance is properties of PHP.
• Accessing the feature of one class of another class.
• Three types that is single, multiple and multilevel inheritance.
• It is the four pillars of oops.
• It allows a class to reuse the code from another class without duplicating it.
• Two classes one is base/main another one is derived class.
• Base class only use its own function but in Derived class it use both function base or derived class.

How to use inheritance in php?

class school {
}
class students extends school {
}
$sch =new school (); // only use class school 
$stu = new students (); // use both class school students (properties and methods)

Example of main/base class use :-

Example of inheritance:

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Constructor is a special type of function of a class which is automatically executed when object of that class is created. Constructor is also called as magic function because in php constructor is start usually with two underscore characters. It saves lot of time on big project.

function __constructor(){
body part;
}

Example of Constructor :-

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• PHP stands for hypertext preprocessor.
• It is widely used in backend programming language.
• PHP programming patterns are procedural/core php and object oriented.
• Lots of framework are use like laravel, CakePHP, Yii, Zend, Codeigniter etc.
• Code more modular and reusable.
• Well organised code.
• Easier to debug.
• Best for large website projects.

Why is it so popular ?

• Code reusable
• Easier to debug
• Best for medium and large website project
• Backend programming use
• Code more modular
• Understanding code easier

What are class and object ?

• Class are the blueprint of object ; Object use blueprint to build their project or functions.
• Class example :- blueprint of house ; Object example :- built house.
• Class function one ; Object function are lots that are related to class function.
• If there is a function which is written in object but not written in class then that function will not work.

What is properties and methods ?

properties like :-

$a;
$b;
$c;
$d;

Methods like :-

sum(){
$c=$a+$b;
return $c;
}

Example of PHP :-

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Following are the Advantages of javaScript over external :-

• Reusability of code.
• Easy code readability.
• It Enables both web designers and coders to work with html and js files.
• With these small js files, you can use Google closure or YUI Compressor or other minifying tools to reduce the size and make it not readable by humans .

Disadvantages :

Following are the disadvantages of javaScript over external :-

• Code can be downloaded using the url of the js file. This can help coders to steal your code easily.
• If two js files are dependent on one another, then a failure in one file may affect the execution of the other dependent file.
• A small change to a common js file may cause unexpected results in some of the HTML files .
• The browser has to make an extra http request to get the js code.

The post JavaScript : Advantages and disadvantages of External JavaScript ? appeared first on scmGalaxy.

1. Between the body tag of html
2. Between the head tag of html
3. In .js file (external javaScript)

1. JavaScript use between html body tag :

Example of javaScript using inside html between body tag.

Output :- Hello World

2. JavaScript use between head tag in html :

Example to use javaScript between head tag in html.

Output :

3. External JavaScript file :

We can create external JavaScript file and embed it in many html page. If you want to run the same JavaScript on several pages in a web site, you should create an external JavaScript file, instead of writing the same script over and over again.

message.js

index.html

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• JavaScript is used to create client-side dynamic pages.
• JavaScript (js) is a light-weight object-oriented programming language.
• JavaScript is not a compiled language, but it is a translated language.
• The JavaScript Translator (embedded in the browser) is responsible for translating the JavaScript code for the web browser.
•  JavaScript, users can build modern web applications to interact directly without reloading the page every time.
• databases such as CouchDB and MongoDB uses JavaScript as their scripting and query language.

Features of JavaScript :

There are following features of js :-

• Object-Centered Script Language
• Light Weight and delicate
• Interpreted language
• Case Sensitive format/language
• Ability to perform In Built Function
• Statements Looping
• Client edge Technology
• Validation of User’s Input
• Else and If Statement
• It uses prototypes rather than using classes for inheritance.
• It is supportable in several operating systems including, Windows, macOS, etc.
• It provides good control to the users over the web browsers.

Application of JavaScript

JavaScript is used to create interactive websites. It is mainly used for:

• Client-side validation
• Manipulating HTML Pages
• User Notifications
• Dynamic drop-down menus
• Displaying date and time
• Displaying pop-up windows 
• Alert dialog box
• Confirm dialog box
• Prompt dialog box
• Back-end Data Loading
• Presentations
• Server Applications
• Displaying clocks etc.

JavaScript Example :

Output :-

Welcome to JavaScript

Hello JavaScript by JavaScript

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Change the alignment of elements with the vertical-alignment utilities.

These are the classes:- .align-baseline, .align-top, .align-middle, .align-bottom, .align-text-bottom, and .align-text-top as needed.

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1. Text alignment :

• .class text-justify
• .class text-left
• .class text-center
• .class text-right
• .class text-sm|md|lg|xl-left

2. Text wrapping and overflow :

• .class text-wrap
• .class text-nowrap
• .class text-truncate

3. Word break :

• .class text-break

4. Text transform :

• .class text-lowercase
• .class text-uppercase
• .class text-capitalize

5. Font weight and italics :

• .class font-weight-bold
• .class font-weight-bolder
• .class font-weight-normal
• .class font-weight-light
• .class font-weight-lighter
• .class font-italic

6. Monospace :

• .class text-monospace

7. Reset color :

• .class text-muted

8. Text decoration

• .class text-decoration-none

The post Bootstrap Utilities : Text appeared first on scmGalaxy.

Where property is one of:

1. m–sets margin
2. p-sets padding

Sides is one of:-

• t-sets margin-padding “top“
• b-sets margin-padding “bottom“
• l-sets margin-padding “left“
• r-sets margin-padding “right“
• x-sets padding left|right or margin left|right
• y-sets padding top|bottom or margin top|bottom
• blank-sets margin padding on all sides of the element

Size is one of:-

• 0-sets m|p to 0
• 1-sets m|p to .25rem
• 2-sets m|p to .5rem
• 3-sets m|p to 1rem
• 4-sets m|p to 1.5rem
• 5-sets m|p to 3rem
• auto-sets margin to auto

Negative margin :-

• n1-sets margin to -.25rem
• n2-sets margin to -.5rem
• n3-sets margin to -1rem
• n4-sets margin to -1.5rem
• n5-sets margin to -3rem

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<div class="shadow-sm p-3 mb-5 bg-white rounded">Small shadow</div>

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