PHP Hello World计划

Question

Hi I'm making a quick PHP program that takes in an integer (x) and prints the numbers from 1 to that number.

• If the number is divisible by 3 then print "Hello".
• If the number is divisible by 7 print "World".
• If the number is divisible by 3 & 7, print "Hello World".

The output is nothing.

$var = 0;   
if (isset($_POST['submit']))
{
     for ($i = 1; $i < $var; $i++) 
     {
          if ($var % 3 == 0)
          {
            echo 'Hello' . "
"; 
          }           

          if ($var % 7 == 0)            
          {
            echo 'World'. "
";
          }

          if (($var % 7 == 0) && ($var % 3 == 0))
          {
            echo 'Hello World'. "
";
          } else {
            echo "";
          }
     }      
}

Answer 1

Your $var is always = to 0. And you should test if ($var % 7 == 0) && ($var % 3 == 0) at first and add else if. Because here if ($var % 7 == 0) && ($var % 3 == 0) the output will be Hello World Hello World. All the if will be executed.

Here the correct code :

if (isset($_POST['submit']))
{
     $var = $_POST['var'];
     for ($i = 1; $i < $var; $i++) 
      {
          if (($var % 7 == 0) && ($var % 3 == 0))
          {
            echo 'Hello World'. "
";
          }
          else if ($var % 3 == 0)
          {
            echo 'Hello' . "
"; 
          }           
          else if ($var % 7 == 0)            
          {
            echo 'World'. "
";
          }          
          else {
            echo "Nothing";
          }
       }      
    }