PHP BLOG - somo la 11: Jinsi ya kutumia prepared statement

Ili kuweza kuelewa vyema post hii tafadhali rejea mafunzo yetu ya php level 3 somo la 21 na 22 [1] utajifunza kwa urefu zaidi kuhusu sql injection na jinsi inavyofanya kazi. Kisha ndipo utajifunza jinsi ya kuzuia kwa kutumia prepared statement. 

Pia ejea mafunzo haya kwa njia ya video kwenye channel yeu inayopatikana kwa jina la tehama-tz kwa link hii https://youtube.com/@tehama-tz

Hapa chini nitakuletea mafaili yaliyobadilishwa baada ya kyfanyiwa njia hii:

post.php

<html>
<head>
<title>create your post</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://cdn.ckeditor.com/4.16.2/standard/ckeditor.js"></script>
<script src="ckeditor.js"></script>
<link rel="stylesheet" href="style.css">
</head>
<body>
<form action="" method="post" enctype="multipart/form-data">
<label for="title">Title</label><br>
<input type="text" name="title" placeholder="write your post title" id="title"><br>

<label for="summary">Summary</label><br>
<input type="text" name="summary" placeholder="write your post summary" id="summary"><br>

<label for="content">content</label><br>
<textarea name="content" id="content" placeholder="wrte your post content"></textarea>
<script>CKEDITOR.replace( 'content' );
</script>
<label for="publisher">publisher</label><br>
<input type="text" name="publisher" placeholder="write your post publisher" id="publisher"><br>

<label for="date">Date</label><br>
<input type="date" name="date" placeholder="write your post date" id="date"><br><br>

<label for="image">upload your image</label>
<input type="file" name="file" accept="image/*" id="image"><br><br>

<input type="submit" name="submit" value="submit">
</form>
<br><br>
</body>
</html>
<?php
include "config.php";
if (isset($_POST['submit'])) {
//start code
// form variables
$title = filter_var($_POST['title'], FILTER_SANITIZE_STRING);
$summary = filter_var($_POST['summary'], FILTER_SANITIZE_STRING);
$content = $_POST['content'];
$publisher = filter_var($_POST['publisher'], FILTER_SANITIZE_STRING);
$date = filter_var($_POST['date'], FILTER_SANITIZE_STRING);
$image = filter_var($_FILES['file']['name'], FILTER_SANITIZE_STRING);
$folder = "upload/";
$location = $_FILES['file']['tmp_name'];
$size = $_FILES['file']['size']; //1024 = 1kb, 1024 kb = 1mb, 1024 = 1 gb 5*1024*1024 = 5242880
$format = ["webp", "jpg", "jpeg", "png"];
$extension = pathinfo($image, PATHINFO_EXTE...