Write a PHP script to swap two numbers using a function (Use Call by value and Call by reference)

Assignment:4 Set A Q.4 Solution

Write a PHP script to swap two numbers using a function (Use Call by value and Call by reference)

          <?php
      //Define call by value function
    
      function call_by_value_swap($x,$y)
        {
          $temp=$x;
          $x=$y;
          $y=$temp;
    
          echo"Values after change a= $x , b=$y";
        }
      //Call by reference function
      function call_by_reference_swap(&$x , &$y)
      {
          $temp=$x;
          $x=$y;
          $y=$temp;
    
          echo"Values after change a= $x , b=$y";
        
      }
    
      //main
    
      echo"Enter value 1\n";
      $n1=intval(readline());
    
      echo"Enter value 2\n";
      $n2=intval(readline());
    
      //Call by value function calling
    
    call_by_value_swap($n1,$n2);
    
    
    echo"\n\nValues befor reference finction number 1: $n1, number 2: $n2\n\n";
    
      //Call by value function calling
    
      call_by_reference_swap($n1,$n2);
    
    echo"\n\nValues after reference Function number 1: $n1, number 2: $n2\n\n";
    ?>