Welcome to Findnerd. Today we are going to disccus two new features introduces in PHP7 that are closure::call. You can bind the outer function in class. It is also known as temporarily binding an object scope to a closure and invoking it. Please have a look.

<?php
class Emp
{
protected $emp_id;
public function getEmp(){
return $this->emp_id;
}
public function Emp($emp_id){
$this->emp_id = $emp_id;
}
}
$emp1 = Emp(233);
$emp2 = Emp(213);
$salaryinfo = function($com_id) { 
echo $this->getEmp() . ' ' . $com_id;
// You can get the salary with the help of employee id and company id
  }
  $salaryinfo->call($emp1,3);
  $salaryinfo->call($emp2,5);
?>

In above example we created a class named Emp and also created one constructor, one function named getEmp. We created two instance of the class and created a closure to reteive the salary from database. Hope this helps.