回答編集履歴
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追記
test
CHANGED
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@@ -3,3 +3,115 @@
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ページネーション以前でとまってる。
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```html
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<?php
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if (isset($_GET['category'])) {
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$category_id = $_GET['category'];
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}
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// パラメータをSQLにそのままセットするな！SQLインジェクション脆弱性あり！！
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$query = "SELECT * FROM posts WHERE category_id = $category_id ORDER BY post_id DESC LIMIT 0, 5";
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$posts_query = mysqli_query($con, $query);
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while ($row = mysqli_fetch_assoc($posts_query)) {
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$post_id = $row['post_id'];
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$post_title = $row['post_title'];
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$post_title = $row['post_author']; // 変数名チェックせよ！
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?>
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<div class="list">
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<h3><?php echo $post_title; ?></h3>
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<p><?php echo $post_author; ?><br></p>
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</div>
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<?php
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//ぺージネーション作成
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// filter_input 使う filter_input(INPUT_GET, 'page')
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if (isset($_GET['page'])) {
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$page = $_GET['page'];
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} else {
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$page = "";
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}
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if ($page == "" || $page == 1) {
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$page_1 = 0;
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} else {
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$page_1 = ($page * 5) - 5;
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}
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// パラメータをSQLにそのままセットするな！SQLインジェクション脆弱性あり！！
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// ループの中でSQLを投げるな。JOIN使え。
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$query_count = "SELECT * FROM posts WHERE category_id = $category_id ORDER BY post_id DESC";
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$find_count = mysqli_query($con, $query_count);
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$count = mysqli_num_rows($find_count);
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$count = ceil($count / 5);
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?>
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<?php } ?>
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<ul class="pager">
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<?php
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for ($i = 1; $i <= $count; $i++) {
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echo "<li><a href='category.php?category=$category_id&page={$i}'>{$i}</a></li>";
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}
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?>
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</ul>
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```
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