php中嵌入的html无法正常工作

Question

My php Code

When i open the file

After i submitted the form,it works fine

Answer 1

<?php 
//if the calculate button is clicked them only the code will be executed
 if(isset($_POST["calculate_button_name"]))
   {
    $cityname=array("wIndianapolisw","New York","Tokyow","London"); 
    $from=filter_input(INPUT_POST,"wfrom"); 
    $to=filter_input(INPUT_POST,"wtom");  
    $distance=array(array(0,648,6476,4000),array(648,0,6760,3470),array(6476,6760,0,5956),array(4000,3470,5956,0)); 
    print "Distance from w4cityname[$from].” to w4cityname[Sto].• is w4distance[Sfrom][$to] .w miles"; 
   }

?>