How to implement common method in php? - function

Question

How to implement a method in a class that can be used by everyone users in php ?
My idea is not to repeat the implementation of readsales in each of the entities
i have 3 users:
admin readSales function,
manager readSales function,
employee, insertSale AND readSales function
Is it possible to implement common methods in a single class? And then call each of the methods to the daughter classes?
abstract class commonMethods {
abstract readSales() {
$pdo = new PDO();
//statements
//readSales
//return $list;
}
}
class Manager extends commonMethods {
function readSales(){
return readSales();
}
}

Answer 1

Yes this is possible, what you need is either a trait or an abstract class.
Here's an example with Abstract class :
<?php
/**
* The abstract class
*/
abstract class CommonMethods
{
public function readSales(){
// Your code
}
public function hello(){
echo "Hello";
}
}
/**
* The Class
*/
class Manager extends CommonMethods
{
// No need to add the "readSales" or "hello" method
// Since we had extended them
public function world(){
echo "World";
}
}
$Manager = new Manager;
$Manager->readSales(); // Works!
$Manager->hello(); // Output: "Hello"
$Manager->world(); // Output: "World"
// The final output: "HelloWorld"
Reference: http://php.net/manual/en/language.oop5.abstract.php