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Display The Value When Submitted a number in PHP

I wrote this code in PHP to present the message if I entered any random number between 1 and 100, but when I submit the value, it doesn’t display anything to me. Here is the code.

   <body>
     
        <h2>The number guess game</h2>
        <form method="POST" action="">
            <label>Enter Number:</label>
            <input type="number" name="num">
            <input type="submit" name="submit" value="Send">
        </form>
        <div>
            <?php echo $message; ?>
        </div>
        
        <?php
            $message="";
            if(isset($_POST["submit"])) {
                $num = $_POST['num'];
                $random = rand(1, 100);
                if ($num == $random) {
                    $message= "You Win!";
                } else {
                    $message= "You Lose!";
                  }
             }
             else{
                echo "Enter The Number";
             }   
        ?>
     </body>
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2

Answers


  1. 0

    The error message indicates that the PHP variable $message is being used before it is declared. This is because PHP code is executed sequentially, and if a variable is used before it is defined, it will result in an error.

    To resolve this issue, the entire code block within the second <?php tags should be moved before the tag. This will ensure that the $message variable is declared and initialized before it is used, preventing the undefined variable error.

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  2. 0

    try this code

    <body>
    <?php
        $message="";
        if(isset($_POST["submit"])) {
            $num = $_POST['num'];
            $random = rand(1, 100);
            if ($num == $random) {
                $message= "You Win!";
            } else {
                $message= "You Lose!";
              }
         }
         else{
            $message= "Enter The Number";
         }   
    ?>
    <h2>The number guess game</h2>
    <form method="POST" action="">
        <label>Enter Number:</label>
        <input type="number" name="num">
        <input type="submit" name="submit" value="Send">
    </form>
    <div>
        <?php echo $message; ?>
    </div>
    
    
 </body>

    You have called your $message variable before php code is executed. so the $message variable is always blank. code above will show message value based on post field or error message

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