1. In the previous topics, we have learned how to create a function, pass data to a function and echo the result inside the function.

2. Sometimes we need to return the result of data instead of 'echo' statement

3. using 'return' statement at the end of the function for returning data to the function caller

                       <?php 

                        //define variables
                        $student1 =["name" => "manoj", "mark" => 90];  
                        $student2 =["name" => "anu",  "mark" => 60];   
                        $student3 =["name" => "hari", "mark" => 80];  

                        //define function
                        function findGrade($marks){

                              if ($marks>=60)
                              {
                                    $grade = "First Division";
                              }
                              else if($marks>=45)
                              {
                                    $grade = "Second Division";
                              }
                              else if($marks>=33)
                              {
                                    $grade = "Third Division";
                              }
                              else
                              {
                                    $grade = "Fail";
                              }

                              return $grade;

                         } 


                         // function call and show the result
                         ?>

                         <table class="table table-bordered">
                              <tr>
                                     <td>
                                     <?php 
                                                echo $student1['name'];
                                          ?>                                          
                                     </td>
                                     <td>
                                     <?php                                                
                                                echo findGrade($student1['mark']);
                                          ?>                                          
                                     </td>
                               </tr>

                               <tr>
                                     <td>
                                     <?php                                                echo $student2['name'];
                                          ?>                                          
                                     </td>
                                     <td>
                                     <?php                                                echo findGrade($student2['mark']);
                                          ?>                                          
                                     </td>
                               </tr>


                               <tr>
                                     <td>
                                     <?php                                                echo $student3['name'];
                                          ?>                                          
                                     </td>
                                     <td>
                                     <?php                                                 echo findGrade($student3['mark']);
                                          ?>                                          
                                     </td>
                               </tr>

                   </table>


                    


                        

1. We don't use php logic or function call between the html tags.

2. We should use all logics and function calls inside the logical part of the coding.

3. We use only the variables inside or between the html tags for showing or presenting the data.

<?php 

 //define variables
 $student1 =["name" => "manoj", "mark" => 90];  
 $student2 =["name" => "anu",  "mark" => 60];   
 $student3 =["name" => "hari", "mark" => 80];  

 //define function
 function findGrade($marks){

       if ($marks>=60)
       {
             $grade = "First Division";
       }
       else if($marks>=45)
       {
             $grade = "Second Division";
       }
       else if($marks>=33)
       {
             $grade = "Third Division";
       }
       else
       {
             $grade = "Fail";
       }

       return $grade;

  } 


  //function call and store the return result in a variable
  $student1['grade'] = findGrade($student1['mark']);
  $student2['grade'] = findGrade($student2['mark']);
  $student3['grade'] = findGrade($student3['mark']);


  //show the result in the html area
  ?>

  <table class="table table-bordered">
       <tr>
              <td>
              <?php 
                         echo $student1['name'];
                   ?>                                          
              </td>
              <td>
              <?php                                                
                         echo  $student1['grade'];
                   ?>                                          
              </td>
        </tr>

        <tr>
              <td>
              <?php                         echo $student2['name'];
                   ?>                                          
              </td>
              <td>
              <?php                         echo  $student2['grade'];
                   ?>                                          
              </td>
        </tr>


        <tr>
              <td>
              <?php                         echo $student3['name'];
                   ?>                                          
              </td>
              <td>
              <?php                          echo  $student3['grade'];
                   ?>                                          
              </td>
        </tr>

</table>