PHP-MySQL-Blog-Website-with.../search.php

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<?php
require 'partials/header.php';
//if input is there
if((isset($_GET['search'])) && isset($_GET['submit'])){
$search=filter_var($_GET['search'], FILTER_SANITIZE_FULL_SPECIAL_CHARS);
$query="SELECT * FROM posts WHERE title like '%$search%' ORDER BY date_time DESC";
$posts=mysqli_query($connection,$query);
}else{
header(("location: " . ROOT_URL . 'blog.php'));
}
?>
<?php if((mysqli_num_rows($posts) > 0)) : ?>
<section class="posts section__extra-margin">
<div class="container posts__container">
<?php while ($post=mysqli_fetch_assoc($posts)) :?>
<article class="post">
<div class="post__thumbnail">
<img src="./images/<?=$post['thumbnail']?>" >
</div>
<div class="post__info">
<?php
//fetch category
$category_id=$post['category_id'];
$category_query="SELECT * FROM categories WHERE id=$category_id";
$category_result=mysqli_query($connection,$category_query);
$category=mysqli_fetch_assoc($category_result);
$author_id=$post['author_id'];
$author_query="SELECT * FROM users WHERE id=$author_id";
$author_result=mysqli_query($connection,$author_query);
$author=mysqli_fetch_assoc($author_result);
?>
<a href="category-posts.php?id=<?=$post['category_id']?>" class="category__button"><?=$category['title']?></a>
<h3 class="post__title"><a href="post.php?id=<?=$post["id"]?>" >
<?=$post['title']?>
</a></h3>
<p class="post__body">
<?= substr($post['body'],0,150) ?>...
</p>
<div class="post__author">
<div class="post__author-avatar">
<img src="./images/<?= $author['avatar'] ?>">
</div>
<div class="post__author-info">
<h5>By: <?= "{$author['firstname']} {$author['lastname']}" ?></h5>
<small>
<?=date("M d, Y -H:i" , strtotime($post['date_time']))?>
</small>
</div>
</div>
</div>
</article>
<?php endwhile ?>
</div>
</section>
<?php else : ?>
<div class="alert__message error lg section__extra-margin">
<p>No post found for this search</p>
</div>
<?php endif?>
<!--=====================================================================
==========================END OF THE POSTS===============================
=================================================================== -->
<section class="category__buttons">
<div class="container category__buttons-container">
<?php
$all_categories_query="SELECT * FROM categories ";
$all_categories_result=mysqli_query($connection,$all_categories_query);
?>
<?php while ( $category=mysqli_fetch_assoc($all_categories_result) ) : ?>
<a href="<?=ROOT_URL?>category-posts.php?id=<?=$category['id']?>" class="category__button"><?=$category['title']?></a>
<?php endwhile?>
</div>
</section>
<!--=======================END OF CATEGORY ===================================-->
<?php
include './partials/footer.php';
?>