Destroying array element + unlink file - php

Question

after uploading files they get converted into a new array. im making a display function to display uploaded files + to destroy them on click
function display($type){
// echo $type;br();
// prettyR($_SESSION[$type]);
// echo"<hr>";
prettyR($_POST);
if(isset($_POST["del"])){
$p = $_POST["del"];
prettyR($_SESSION["misc"][$p]);
unlink($_SESSION["misc"][$p]["filename"]);
// $_SESSION["misc"][$p]["filename"] looks like this: upload/63eb3d2b83068_misc.jpg
unset($_SESSION["misc"][$p]);
}
echo"<form method='post'><input type='hidden' name='ka'></form>";
// this form is here so that the other forms work, because the display is in another form
if($type == "misc"){
// echo"<hr>";
// echo"hi";
foreach($_SESSION[$type] as $file){
echo"<hr>";
// echo"hi";
echo $file["name"];
$key = $file["type"];
echo"<form method='post'> <input type='hidden' value='$key' name='del'>";
echo"<input type='submit'>";
echo"</form>";
}
}
}
but instead this message appears
Warning: Undefined array key "63eb3d2b83c20" in
im expecting this function to delete the files from the folder and to unset the informations from the misc array

Answer 1

ifound the answer: ive been using a live server on vscode. that means right after the files get deleted the page reloads again, that means that the web server tries to unset something that doesnt exist. im sorry for my bad explenation, english istn my native language