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I can't get the right result


Ivan007
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Go to solution Solved by Steveinid,

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<?php

//It's a simple program to valid age but it only print 'you can vote' despite any value I input.

$age=(isset($_POST['age']));

    if(isset($_POST['age'])){

        if($age >=18){

            echo "you can vote!!!";

        }elseif($age < 18){

            echo "You are not allowed to vote";

            }else{

                echo "enter a valid age";

        }

    

?>

    <!DOCTYPE html>

    <html lang="en">

    <head>

        <meta charset="UTF-8">

        <meta http-equiv="X-UA-Compatible" content="IE=edge">

        <meta name="viewport" content="width=device-width, initial-scale=1.0">

        <title>Document</title>

    </head>

    <body>

        <form method="post">

            <input type="text" name="age">

            <input type="submit">

        </form>

    </body>

</html>

 

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Try this...

<?php
//It's a simple program to valid age but it only print 'you can vote' despite any value I input.
if($_POST['age']){
  $age = int $_POST['age'];

  if($age >= 18){
    echo "you can vote!!!";
  }elseif($age < 18){
    echo "You are not allowed to vote";
  }else{
    echo "enter a valid age";
  }
}
?>

 

Also on your form use this instead... it means the user can only put a number in...

<input type="number" name="age">

 

Edited by DanRz
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3 hours ago, ginerjm said:

Since posted values, excluding radio and checkboxes, are always set, the test for isset doesn't really do anything.  You have to validate the input value by checking the value.

When you initially arrive to the page there is nothing set so it tells the visitor to 'Enter a valid age'.

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