如果文本框内容为空，请执行

I got a problem with my code. I want to figure out if there is a specific number in the text box and if it's empty it should say something like "There's nothing inside".

I did so but got a problem if the text box is empty. If it's empty it skips the code for checking if it's empty, proceeds with the function after it.

That's what I got so far.

<?php
 if(isset($_POST["submit"])){
  $name = $_POST['winner'];
  if(strpos($name,'123456789') !== false){
   echo "<br><br>".$name." was the correct answer! Congratulations!";
  }elseif($name !== ""){
   echo "<br><br>You haven't typed in a number.";
  }else{
   echo "<br><br>".$name." wasn't correct. Better luck next time.";
  }
 }
?>

Anyone know what the error is?

This statement:

}elseif($name !== ""){

Should be:

}elseif ($name === ""){

Or:

}elseif (!strlen($name)){

I think you meant the opposite.

Should be elseif($name === "") not elseif($name !== "")

or also elseif(empty($name))

you want that if user leave text field empty it again ask for that ...

give me your email I'll mail you an example. ....