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How to use an initialized php variable in some php block of code to an other block of php code?

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I am trying to initialize a variable called $btn with a value, and later on use that $btn value in some other php block of code. My code is the following (explaining right after what i want to achieve) :

<?php
    session_start();
    require '../../vendor/autoload.php';
    $m = new MongoDB\Client("mongodb://127.0.0.1/");
    $db = $m->users;
    $collection = $db->usersInfo;
    if(!isset($_SESSION['user'])){
        header('Location: ../../home/website.php');
        exit;
    }
    $btn = '';
    if($_SERVER["REQUEST_METHOD"] == "POST"){
        if(isset($_POST[$btn])){
            echo $btn;
            echo "</script>alert($btn)</script>";
            $query = $db->usersInfo;
            $filter = array('_id'=>$_SESSION['user']);
            $update = array('$addToSet'=>array('ctfs'=>$btn));
            $query->updateOne($filter,$update);
        }
    }
?>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Cyberdemia</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" href="styles.css">
        <!-- font awesome -->
        <script src="https://kit.fontawesome.com/dbed6b6114.js" crossorigin="anonymous"></script>
    </head>
    <body>



        
        <div class="toggle"></div>

        <div class = "products">
            <nav>
                <ul>
                    <!--Will edit these in the future to get styles such as on-hover etc.-->
                    <li><a href="../ctfs.php"><small>Back</small></a></li>
                    <li><a href="../../home/website.php"><small>Home</small></a></li>
                    <li><a href="../../userProfile/userProfile.php"><small>Profile</small></a></li>
                    <li><a href="../../signOut/signout.php"><small>Sign out</small></a></li>
                </ul>
            </nav>
            <div class = "container">
                <h1 class = "lg-title">Welcome to the Reverse Engineering challenges</h1>
                
                <div class = "product-items">
                
                    <?php
                        $db = $m->users;
                        $collection = $db->usersInfo;
                        
                        $collectionAdmin = $db->adminInfo;
                        $query = $db->adminInfo->findOne(array('email'=>'[email protected]'));
                        if($query["timesLogged"] == "0"){
                            $db = $m->ctfs;
                            $collectionCtfs = $db->ctfsReverse->find();
                            foreach ($collectionCtfs as $chall){
                                $btn = $chall["challName"];
                                #echo $btn;
                                echo '<div class = "product">
                    <div class = "product-content">
                        <div class = "product-img">
                            <img src = "images/rev.png" alt = "product image">
                        </div>
                        <div class = "product-btns">
                            <form action="rev.php" method="post">
                                <button type="submit" name="'.$btn.'" value="'.$btn.'" class = "btn-cart"> play later list
                                    <span><i class = "fas fa-plus"></i></span>
                                </button>
                            </form>
                            <button type = "button" class = "btn-buy"> Play now
                                <span><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-controller" viewBox="0 0 16 16">
                                    <path d="M11.5 6.027a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0zm-1.5 1.5a.5.5 0 1 0 0-1 .5.5 0 0 0 0 1zm2.5-.5a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0zm-1.5 1.5a.5.5 0 1 0 0-1 .5.5 0 0 0 0 1zm-6.5-3h1v1h1v1h-1v1h-1v-1h-1v-1h1v-1z"/>
                                    <path d="M3.051 3.26a.5.5 0 0 1 .354-.613l1.932-.518a.5.5 0 0 1 .62.39c.655-.079 1.35-.117 2.043-.117.72 0 1.443.041 2.12.126a.5.5 0 0 1 .622-.399l1.932.518a.5.5 0 0 1 .306.729c.14.09.266.19.373.297.408.408.78 1.05 1.095 1.772.32.733.599 1.591.805 2.466.206.875.34 1.78.364 2.606.024.816-.059 1.602-.328 2.21a1.42 1.42 0 0 1-1.445.83c-.636-.067-1.115-.394-1.513-.773-.245-.232-.496-.526-.739-.808-.126-.148-.25-.292-.368-.423-.728-.804-1.597-1.527-3.224-1.527-1.627 0-2.496.723-3.224 1.527-.119.131-.242.275-.368.423-.243.282-.494.575-.739.808-.398.38-.877.706-1.513.773a1.42 1.42 0 0 1-1.445-.83c-.27-.608-.352-1.395-.329-2.21.024-.826.16-1.73.365-2.606.206-.875.486-1.733.805-2.466.315-.722.687-1.364 1.094-1.772a2.34 2.34 0 0 1 .433-.335.504.504 0 0 1-.028-.079zm2.036.412c-.877.185-1.469.443-1.733.708-.276.276-.587.783-.885 1.465a13.748 13.748 0 0 0-.748 2.295 12.351 12.351 0 0 0-.339 2.406c-.022.755.062 1.368.243 1.776a.42.42 0 0 0 .426.24c.327-.034.61-.199.929-.502.212-.202.4-.423.615-.674.133-.156.276-.323.44-.504C4.861 9.969 5.978 9.027 8 9.027s3.139.942 3.965 1.855c.164.181.307.348.44.504.214.251.403.472.615.674.318.303.601.468.929.503a.42.42 0 0 0 .426-.241c.18-.408.265-1.02.243-1.776a12.354 12.354 0 0 0-.339-2.406 13.753 13.753 0 0 0-.748-2.295c-.298-.682-.61-1.19-.885-1.465-.264-.265-.856-.523-1.733-.708-.85-.179-1.877-.27-2.913-.27-1.036 0-2.063.091-2.913.27z"/>
                                </svg></span>
                            </button>
                        </div>
                    </div>

                    <div class = "product-info">
                        <div class = "product-info-top">
                            <h2 class = "sm-title">Ratings</h2>
                            <div class = "rating">
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "far fa-star"></i></span>
                            </div>
                        </div>
                        <hr>
                        <a href = "#" class = "product-name">'.$chall["challName"].'</a>
                        <hr>
                        <a href = "#" class = "product-name">'.$chall["difficulty"].'</a>
                    </div>

                </div>';
                            }
                            
                        }
                    ?>
                    
                    
                    
                </div>
            </div>
        </div>

        <script src="https://code.jquery.com/jquery-3.6.1.js"></script>
        <script src="script.js"></script>
        
    </body>
</html>

In the first php block of code i am connecting to a mongodb i am using. In this db, there are is a collection called ctfsReverse and usersInfo . What i am doing is giving the value of each challenge name to the variable $btn :

foreach ($collectionCtfs as $chall){
    $btn = $chall["challName"];

Then i use this variable as an html attribute in the value and name fields :

<form action="rev.php" method="post">
    <button type="submit" name="'.$btn.'" value="'.$btn.'" class = "btn-cart"> play later list
        <span><i class = "fas fa-plus"></i></span>
    </button>
</form>

So as you can see in the first block of my php code, i want to check for a post request, and if this post request was due to a button being pressed (where the buttons value is actually the $btn contents) i want to store in my db the name of the button that was pressed :

$query = $db->usersInfo;
$filter = array('_id'=>$_SESSION['user']);
$update = array('$addToSet'=>array('ctfs'=>$btn));
$query->updateOne($filter,$update);

But the $btn variable seems to not be visible to the first php block of code. When i press the button, the $btn value does not get stored in the database.

How can i make the $btn globally defined? I tried using php $GLOBALS but it didnt work. I even tried checking for button being pressed in the second php block of code, but this didnt work either :

<div class = "container">
                <h1 class = "lg-title">Welcome to the Reverse Engineering challenges</h1>
                
                <div class = "product-items">
                
                    <?php
                        $db = $m->users;
                        $collection = $db->usersInfo;
                        
                        $collectionAdmin = $db->adminInfo;
                        $query = $db->adminInfo->findOne(array('email'=>'[email protected]'));
                        if($query["timesLogged"] == "0"){
                            $db = $m->ctfs;
                            $collectionCtfs = $db->ctfsReverse->find();
                            foreach ($collectionCtfs as $chall){
                                $btn = $chall["challName"];
                                #echo $btn;
                                echo '<div class = "product">
                    <div class = "product-content">
                        <div class = "product-img">
                            <img src = "images/rev.png" alt = "product image">
                        </div>
                        <div class = "product-btns">
                            <form action="rev.php" method="post">
                                <button type="submit" name="'.$btn.'" value="'.$btn.'" class = "btn-cart"> play later list
                                    <span><i class = "fas fa-plus"></i></span>
                                </button>
                            </form>
                            <button type = "button" class = "btn-buy"> Play now
                                <span><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-controller" viewBox="0 0 16 16">
                                    <path d="M11.5 6.027a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0zm-1.5 1.5a.5.5 0 1 0 0-1 .5.5 0 0 0 0 1zm2.5-.5a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0zm-1.5 1.5a.5.5 0 1 0 0-1 .5.5 0 0 0 0 1zm-6.5-3h1v1h1v1h-1v1h-1v-1h-1v-1h1v-1z"/>
                                    <path d="M3.051 3.26a.5.5 0 0 1 .354-.613l1.932-.518a.5.5 0 0 1 .62.39c.655-.079 1.35-.117 2.043-.117.72 0 1.443.041 2.12.126a.5.5 0 0 1 .622-.399l1.932.518a.5.5 0 0 1 .306.729c.14.09.266.19.373.297.408.408.78 1.05 1.095 1.772.32.733.599 1.591.805 2.466.206.875.34 1.78.364 2.606.024.816-.059 1.602-.328 2.21a1.42 1.42 0 0 1-1.445.83c-.636-.067-1.115-.394-1.513-.773-.245-.232-.496-.526-.739-.808-.126-.148-.25-.292-.368-.423-.728-.804-1.597-1.527-3.224-1.527-1.627 0-2.496.723-3.224 1.527-.119.131-.242.275-.368.423-.243.282-.494.575-.739.808-.398.38-.877.706-1.513.773a1.42 1.42 0 0 1-1.445-.83c-.27-.608-.352-1.395-.329-2.21.024-.826.16-1.73.365-2.606.206-.875.486-1.733.805-2.466.315-.722.687-1.364 1.094-1.772a2.34 2.34 0 0 1 .433-.335.504.504 0 0 1-.028-.079zm2.036.412c-.877.185-1.469.443-1.733.708-.276.276-.587.783-.885 1.465a13.748 13.748 0 0 0-.748 2.295 12.351 12.351 0 0 0-.339 2.406c-.022.755.062 1.368.243 1.776a.42.42 0 0 0 .426.24c.327-.034.61-.199.929-.502.212-.202.4-.423.615-.674.133-.156.276-.323.44-.504C4.861 9.969 5.978 9.027 8 9.027s3.139.942 3.965 1.855c.164.181.307.348.44.504.214.251.403.472.615.674.318.303.601.468.929.503a.42.42 0 0 0 .426-.241c.18-.408.265-1.02.243-1.776a12.354 12.354 0 0 0-.339-2.406 13.753 13.753 0 0 0-.748-2.295c-.298-.682-.61-1.19-.885-1.465-.264-.265-.856-.523-1.733-.708-.85-.179-1.877-.27-2.913-.27-1.036 0-2.063.091-2.913.27z"/>
                                </svg></span>
                            </button>
                        </div>
                    </div>

                    <div class = "product-info">
                        <div class = "product-info-top">
                            <h2 class = "sm-title">Ratings</h2>
                            <div class = "rating">
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "far fa-star"></i></span>
                            </div>
                        </div>
                        <hr>
                        <a href = "#" class = "product-name">'.$chall["challName"].'</a>
                        <hr>
                        <a href = "#" class = "product-name">'.$chall["difficulty"].'</a>
                    </div>

                </div>';
                            }
                            
                        }
              if($_SERVER["REQUEST_METHOD"] == "POST"){
        if(isset($_POST[$btn])){
            echo $btn;
            echo "</script>alert($btn)</script>";
            $query = $db->usersInfo;
            $filter = array('_id'=>$_SESSION['user']);
            $update = array('$addToSet'=>array('ctfs'=>$btn));
            $query->updateOne($filter,$update);
        }
    }
                    ?>
                    
                    
                    
                </div>
            </div>
        </div>

Edit : Also, if i try to "View page source", the name and value attributes get the correct values :

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Cyberdemia</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" href="styles.css">
        <!-- font awesome -->
        <script src="https://kit.fontawesome.com/dbed6b6114.js" crossorigin="anonymous"></script>
    </head>
    <body>



        
        <div class="toggle"></div>

        <div class = "products">
            <nav>
                <ul>
                    <!--Will edit these in the future to get styles such as on-hover etc.-->
                    <li><a href="../ctfs.php"><small>Back</small></a></li>
                    <li><a href="../../home/website.php"><small>Home</small></a></li>
                    <li><a href="../../userProfile/userProfile.php"><small>Profile</small></a></li>
                    <li><a href="../../signOut/signout.php"><small>Sign out</small></a></li>
                </ul>
            </nav>
            <div class = "container">
                <h1 class = "lg-title">Welcome to the Reverse Engineering challenges</h1>
                
                <div class = "product-items">
                
                    <div class = "product">
                    <div class = "product-content">
                        <div class = "product-img">
                            <img src = "images/rev.png" alt = "product image">
                        </div>
                        <div class = "product-btns">
                            <form action="rev.php" method="post">
                                <button type="submit" name="rev level 1" value="rev level 1" class = "btn-cart"> play later list
                                    <span><i class = "fas fa-plus"></i></span>
                                </button>
                            </form>
                            <button type = "button" class = "btn-buy"> Play now
                                <span><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-controller" viewBox="0 0 16 16">
                                    <path d="M11.5 6.027a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0zm-1.5 1.5a.5.5 0 1 0 0-1 .5.5 0 0 0 0 1zm2.5-.5a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0zm-1.5 1.5a.5.5 0 1 0 0-1 .5.5 0 0 0 0 1zm-6.5-3h1v1h1v1h-1v1h-1v-1h-1v-1h1v-1z"/>
                                    <path d="M3.051 3.26a.5.5 0 0 1 .354-.613l1.932-.518a.5.5 0 0 1 .62.39c.655-.079 1.35-.117 2.043-.117.72 0 1.443.041 2.12.126a.5.5 0 0 1 .622-.399l1.932.518a.5.5 0 0 1 .306.729c.14.09.266.19.373.297.408.408.78 1.05 1.095 1.772.32.733.599 1.591.805 2.466.206.875.34 1.78.364 2.606.024.816-.059 1.602-.328 2.21a1.42 1.42 0 0 1-1.445.83c-.636-.067-1.115-.394-1.513-.773-.245-.232-.496-.526-.739-.808-.126-.148-.25-.292-.368-.423-.728-.804-1.597-1.527-3.224-1.527-1.627 0-2.496.723-3.224 1.527-.119.131-.242.275-.368.423-.243.282-.494.575-.739.808-.398.38-.877.706-1.513.773a1.42 1.42 0 0 1-1.445-.83c-.27-.608-.352-1.395-.329-2.21.024-.826.16-1.73.365-2.606.206-.875.486-1.733.805-2.466.315-.722.687-1.364 1.094-1.772a2.34 2.34 0 0 1 .433-.335.504.504 0 0 1-.028-.079zm2.036.412c-.877.185-1.469.443-1.733.708-.276.276-.587.783-.885 1.465a13.748 13.748 0 0 0-.748 2.295 12.351 12.351 0 0 0-.339 2.406c-.022.755.062 1.368.243 1.776a.42.42 0 0 0 .426.24c.327-.034.61-.199.929-.502.212-.202.4-.423.615-.674.133-.156.276-.323.44-.504C4.861 9.969 5.978 9.027 8 9.027s3.139.942 3.965 1.855c.164.181.307.348.44.504.214.251.403.472.615.674.318.303.601.468.929.503a.42.42 0 0 0 .426-.241c.18-.408.265-1.02.243-1.776a12.354 12.354 0 0 0-.339-2.406 13.753 13.753 0 0 0-.748-2.295c-.298-.682-.61-1.19-.885-1.465-.264-.265-.856-.523-1.733-.708-.85-.179-1.877-.27-2.913-.27-1.036 0-2.063.091-2.913.27z"/>
                                </svg></span>
                            </button>
                        </div>
                    </div>

                    <div class = "product-info">
                        <div class = "product-info-top">
                            <h2 class = "sm-title">Ratings</h2>
                            <div class = "rating">
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "far fa-star"></i></span>
                            </div>
                        </div>
                        <hr>
                        <a href = "#" class = "product-name">rev level 1</a>
                        <hr>
                        <a href = "#" class = "product-name">difficulty - easy</a>
                    </div>

                </div><div class = "product">
                    <div class = "product-content">
                        <div class = "product-img">
                            <img src = "images/rev.png" alt = "product image">
                        </div>
                        <div class = "product-btns">
                            <form action="rev.php" method="post">
                                <button type="submit" name="rev level 2" value="rev level 2" class = "btn-cart"> play later list
                                    <span><i class = "fas fa-plus"></i></span>
                                </button>
                            </form>
                            <button type = "button" class = "btn-buy"> Play now
                                <span><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-controller" viewBox="0 0 16 16">
                                    <path d="M11.5 6.027a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0zm-1.5 1.5a.5.5 0 1 0 0-1 .5.5 0 0 0 0 1zm2.5-.5a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0zm-1.5 1.5a.5.5 0 1 0 0-1 .5.5 0 0 0 0 1zm-6.5-3h1v1h1v1h-1v1h-1v-1h-1v-1h1v-1z"/>
                                    <path d="M3.051 3.26a.5.5 0 0 1 .354-.613l1.932-.518a.5.5 0 0 1 .62.39c.655-.079 1.35-.117 2.043-.117.72 0 1.443.041 2.12.126a.5.5 0 0 1 .622-.399l1.932.518a.5.5 0 0 1 .306.729c.14.09.266.19.373.297.408.408.78 1.05 1.095 1.772.32.733.599 1.591.805 2.466.206.875.34 1.78.364 2.606.024.816-.059 1.602-.328 2.21a1.42 1.42 0 0 1-1.445.83c-.636-.067-1.115-.394-1.513-.773-.245-.232-.496-.526-.739-.808-.126-.148-.25-.292-.368-.423-.728-.804-1.597-1.527-3.224-1.527-1.627 0-2.496.723-3.224 1.527-.119.131-.242.275-.368.423-.243.282-.494.575-.739.808-.398.38-.877.706-1.513.773a1.42 1.42 0 0 1-1.445-.83c-.27-.608-.352-1.395-.329-2.21.024-.826.16-1.73.365-2.606.206-.875.486-1.733.805-2.466.315-.722.687-1.364 1.094-1.772a2.34 2.34 0 0 1 .433-.335.504.504 0 0 1-.028-.079zm2.036.412c-.877.185-1.469.443-1.733.708-.276.276-.587.783-.885 1.465a13.748 13.748 0 0 0-.748 2.295 12.351 12.351 0 0 0-.339 2.406c-.022.755.062 1.368.243 1.776a.42.42 0 0 0 .426.24c.327-.034.61-.199.929-.502.212-.202.4-.423.615-.674.133-.156.276-.323.44-.504C4.861 9.969 5.978 9.027 8 9.027s3.139.942 3.965 1.855c.164.181.307.348.44.504.214.251.403.472.615.674.318.303.601.468.929.503a.42.42 0 0 0 .426-.241c.18-.408.265-1.02.243-1.776a12.354 12.354 0 0 0-.339-2.406 13.753 13.753 0 0 0-.748-2.295c-.298-.682-.61-1.19-.885-1.465-.264-.265-.856-.523-1.733-.708-.85-.179-1.877-.27-2.913-.27-1.036 0-2.063.091-2.913.27z"/>
                                </svg></span>
                            </button>
                        </div>
                    </div>

                    <div class = "product-info">
                        <div class = "product-info-top">
                            <h2 class = "sm-title">Ratings</h2>
                            <div class = "rating">
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "fas fa-star"></i></span>
                                <span><i class = "far fa-star"></i></span>
                            </div>
                        </div>
                        <hr>
                        <a href = "#" class = "product-name">rev level 2</a>
                        <hr>
                        <a href = "#" class = "product-name">difficulty - medium</a>
                    </div>

                </div>                    
                    
                    
                </div>
            </div>
        </div>

        <script src="https://code.jquery.com/jquery-3.6.1.js"></script>
        <script src="script.js"></script>
        
    </body>
</html>
php html mongodb global-variables php-mongodb
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