Traits method overriding

 <?php

//Here below, we have called same method from Trait, parent Class as well as Child Class.We have
//called "sayhello" method using Child Class Object. So here First Priority will be given to the Child
//Class(if method present in the Child class)then Second Priority will be given to the trait
//(if method present in the trait) and then Third Priority will be given to the Parent Class
//(if method present in the parent Class).

//  EXAMPLE 1 :
// trait hello
// {
//     public function sayhello()
//     {
//         echo "Hello from trait" . "<br>";
//     }
// }
// class Base
// {
//     public function sayhello()
//     {
//         echo "Hello from Base Class" . "<br>";
//     }
// }
// class Child extends Base
// {
//     use hello;
//     public function sayhello()
//     {
//         echo "Hello from Child Class" . "<br>";
//     }
// }
// $test = new Child();
// $test->sayhello();

//  EXAMPLE 2:
//If We have multiple traits with the same method name and if we want to call any specific method from
//any specific trait then we can follow below steps:
//In the Base class we can specify all the traits after that we can specifity syntax as below:
//trait_name::function_name insteadOf another_trait_name;
//And also we can call another function from another traits by Renaming those Function as shown below:

// trait hello
// {
//     public function sayhello()
//     {
//         echo "Hello from Hello trait" . "<br>";
//     }
// }
// trait hi
// {
//     public function sayhello()
//     {
//         echo "Hello from Hi trait" . "<br>";
//     }
// }
// class Base
// {
//     use hello, hi {
//         hello::sayhello insteadOf hi;
//         hi::sayhello as newhello;   //We can Rename the function from sayhello to newhello
//     }
// }
// $test = new Base();
// $test->sayhello();
// $test->newhello();

//  EXAMPLE 3:
//We can't access private method directly. So to use privated method(from trait) in Class as can make
//privated method to public as shown below:
trait hello
{
    private function sayhello()
    {
        echo "Hello from Hello trait" . "<br>";
    }
}
class Base
{
    use hello {
        //Making private method to public and we can Rename to method as shown below:
        hello::sayhello as public newhello;
    }
}
$test = new Base();
$test->newhellow();

?>

Comments

Post a Comment

Popular posts from this blog

Logical_Operators

  <?php     $age = 20 ;     $age1 = 25 ;     if ( $age >= 18 && $age <= 21 )     {         echo "You are Eligible<br>" ;     }         if ( $age >= 18 || $age <= 21 )     {         echo "You are Eligible<br>" ;     }     //Below condition is True So that "Not Operator(!)" will return False condition     if (!( $age >= 18 ))     {         echo "You are Eligible<br>" ;     }     //Below condition is False So that "Not Operator(!)" will return True condition     if (!( $age <= 18 ))     {         echo "You are Eligible<br>" ;     }     //If both condition is "True" OR "False" at that time xor will return "False" and if one condition is     //"True" and s...
Read more

SubQuery with EXISTS and NOT EXISTS in PHP

 SELECT with SubQuery Syntax : SELECT columns FROM table1 WHERE column = (SELECT columns FROM table2 WHERE condition); In "personal" table, there are 6 columns named id, name, percentage, age, gender, city. In "personal" table, column name "id" is PRIMARY KEY and column name "city" is FOREIGN KEY. In "courses" table, there are 2 columns named course_id and course_name. In "courses" table, column name "course_id" is PRIMARY KEY. In "city" table, there are 2 columns named cid and cityname. In "city" table, column name "cid" is PRIMARY KEY. If we want to select records from "personal" table who belong to Delhi from "city" table using SubQuery then we can use below shown sql query : SELECT name FROM personal WHERE city = (SELECT cid FROM city WHERE cityname = "Delhi"); If we want to select records from "personal" table who belong to Delhi and Agra from...
Read more

Get Functions

  <?php //There are many Get Functions in PHP as shown below: //get_class, get_parent_class, get_class_methods, get_class_vars, get_object_vars, get_called_class, //get_declared_classes, get_declared_interfaces, get_declared_traits, class_alias class ParentClass {     function name ()     {         echo "Class Name : " . get_class ( $this ) . "<br>" ;   //Print the particualr Class Name         //Print the particular Parent Class Name as shown below:         echo "Parent Class Name : " . get_parent_class ( $this ) . "<br>" ;     } } class ChildClass extends ParentClass {     function __construct ()     {}     function myfunction ()     {}     function myfunction2 ()     {} } $obj = new ChildClass (); $obj -> name (); echo "Class Name is : " . get_class ( $obj ) . "<br>" ; echo "Paren...
Read more