eliminare due record sul database

[imperor]

eliminare due record sul database

salve sto tentando di eliminare due record sul database ma non riesco a farlo funzionare sicuramente sbaglierò qualcosa

<ul id="chatList"
    		    class="list-group mvh-50 overflow-auto">
    			<?php if (!empty($conversations)) { ?>
    			    <?php 

    			    foreach ($conversations as $conversation){ ?>
	    			<li class="list-group-item">
					<p>Elimina chat</p>
					<form action="delchat.php" method="post" enctype="multipart/form-data">
					<input name="chat_id"/>
					<input type="hidden" value="<?= $_SESSION['name'] ?>">  
					<input type="submit" name="del" value="Elimina chat">
					</form>
	    				<a href="chat.php?user=<?=$conversation['username']?>"
	    				   class="d-flex
	    				          justify-content-between
	    				          align-items-center p-2">
	    					<div class="d-flex
	    					            align-items-center">
	    					    <img src="uploads/<?=$conversation['p_p']?>"
	    					         class="w-10 rounded-circle">		  
	    					    <h3 class="fs-xs m-2">
								    <?=$conversation['username']?><br>
	    					    	<?=$conversation['name']?><br>
                      <small>
                        <?php 
                          echo lastChat($_SESSION['user_id'], $conversation['user_id'], $conn);
                        ?>
                      </small>
------------------------------------------
file delchat.php

<?php
	include('app/db.conn.php');
	
	if (isset($_POST['del'])){
		$chat_id=$_POST['chat_id'];
		
		
		mysqli_query($conn,"delete from `chats` where chat_id='$chat_id'");
		mysqli_query($conn,"delete from `conversations` where conversation_id='$conversation_id'");
		header("Location: home.php");
	}
?>

[massimux]

@imperor quale errore ti restituisce?