PHP函数和if / else语句

Question

I am trying to write a script that includes if/else statements and functions. some background

• $parts first character should have the letter "N"
• $desc is suppose to be at least one character long
• $price needs to be positive (0 or higher)

if all three of theses requirements are met then it should say "data accepted" if something is not met (one or all) the "Invalid...." needs to show.

can someone tell me what part of my script I should look at.

<?php
$parts = $_POST["parts"];
$desc  = $_POST["desc"];
$price = $_POST["price"];

$pa = substr($parts, 0, 1);
$de = strlen($desc);

if ($pa != "N")
 {echo "Invalid Part Number";}
else
 if ($de <= 1)
  {echo "Invalid Description Length";}
 else
  if ($price <= 0)
   {echo "Invalid Price";}
    else
     {echo "Data Accepted";}
?>

Answer 1

The second if should be if($de==1) $de=1 will always return true.

Also add semicolons after each statement.