linki\zmien.php

<!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>zmiana linku</title>
</head>
<body>

    <?php
    $canProceed = true;

    if(empty($_GET['linkID'])){$canProceed = false;}

    if($canProceed)
    {
        $linkID = $_GET['linkID'];
        $conn = mysqli_connect('localhost','root','','linki');

        $q = mysqli_query($conn,"SELECT * FROM linki WHERE id=".$linkID.";");
        $a = mysqli_fetch_array($q);

        echo "<form method='POST' action=''>";
        echo "<input name='newLink' type='text' value='".$a['zawartosc']."'>";
        echo "<button type='submit'>Potwierdź zmiany</button>";
        echo "</form>";
    }

    if(empty($_POST['newLink'])){$canProceed = false;}

    if($canProceed)
    {
        $newLink = $_POST['newLink'];

        $q = mysqli_query($conn,"UPDATE `linki` SET `zawartosc` = '".$newLink."' WHERE `linki`.`id` = ".$linkID.";");

        echo "Zmieniono link o ID: ".$linkID." na: ".$newLink;
        header('Location: ignaczak.php');
    }

    ?>
</body>
</html>