[ Posted by Majid ] Updated the php code

fiddle_018277.php

<?php


$x=5;
$y=6;
$a=1;




switch ($a) {

  case '1':
    sum($x,$y);
    break;

    case '2':
    minus($x,$y);
    break;
    case '3':
    multiply($x,$y);
    break;
    case '4':
    divide($x,$y);
    break;
  default:
     echo"invalid number using switch()";
    break;
}

  
  function sum($x,$y){
    $sum=$x+$y;
    echo " this is sum value using Switch() =$sum";
  }

  function minus($x,$y){

   $minus=$x-$y;
    echo " this is minus vlaue using Switch() =$minus";
  }
  function multiply($x,$y){

   $multiply=$x*$y;
    echo " This is multiply value using Switch() =$multiply";
  }
  function divide($x,$y){

    $divide=$x/$y;
    echo " this is divide value  using Switch()=$divide";
  }

  ?>
 
<br/>

<?php

$n=5;
$z=6;
$p=1;

   

   if($p==1){
    sum_f($n,$z);
   }

   elseif($p==2){
    minus_f($n,$z);
   }

   elseif($p==3){
    multiply_f($n,$z);
   }

   elseif($p==4){
   divide_f($n,$z);
   }

   else
  {
     echo "Sorry invalid number using If-else condition";
  }
  
  function sum_f($n,$z){
    $sum=$n+$z;
    echo " this is sum value  using If-else condition =$sum";
  }

  function minus_f($n,$z){

   $minus=$n-$z;
    echo "this is minus value  using If-else condition =$minus";
  }
  function multiply_f($n,$z){

   $multiply=$n*$z;
    echo " this is multiply value  using If-else condition=$multiply";
  }
  function divide_f($n,$z){

    $divide=$n/$z;
    echo " this is divide value  using If-else condition=$divide";
  }
  

?>