php - unset 给出 array_search() 期望参数 2 是数组，给定字符串

Question

我有一个IDfromGET并检查它ID是否在 a 中custom field，如果是，则放置一个删除按钮，否则显示一个add button

custom field每次我们发送值时都会得到一个，string但为了删除它，我unset在数组中使用它，同时检查它current ID是否存在。

我在混音implode和混音时变得非常困惑explode

整个代码：

$postId = $_GET['postId'];
$allposts = '';
$user_id = get_current_user_id();
$userPosts = get_user_meta( $user_id, 'save_post', TRUE );
$userPosts = explode(',', $userPosts);
$response = wp_remote_get('https://example.com/wp-json/wp/v2/posts?include='.$postId);
if ( is_wp_error( $response ) ) {
    return;
}
$posts = json_decode( wp_remote_retrieve_body( $response ) );
if ( empty( $posts ) ) {
    return;
}
if ($_SERVER['REQUEST_METHOD'] == "POST") {
    if (isset($_POST['save_post'])) {
        array_push($userPosts, $postId);
        $userPosts = array_values(array_unique($userPosts));
        $userPosts = implode(',', $userPosts);
        $userPosts = trim($userPosts);
        $userPosts = ltrim($userPosts, ",");
        update_user_meta( $user_id, 'save_post', $userPosts );
    }
    if (isset($_POST['remove_post'])) {
        if (($key = array_search($postId, $userPosts)) !== false) {
            unset($userPosts[$key]);
        }
        $userPosts = implode(',', $userPosts);
        $userPosts = trim($userPosts);
        $userPosts = ltrim($userPosts, ",");
        update_user_meta( $user_id, 'save_post', $userPosts );
    }
}
if ( ! empty( $posts ) ) {
    // For each post.
    foreach ( $posts as $post ) {
        $allposts .= '<a href="' . esc_url( $post->link ) . '" target=\"_blank\">' . esc_html( $post->title->rendered ) . '</a>  ' . esc_html( $fordate ) . '<br />'.$post->content->rendered;
    ?>
    <div class="container margin-top-80 margin-bottom-80">
        <div class="row">
            <div class="col-8">
                <form id="savedPosts" action="" method="POST" class="" autocomplete="off">
                    <input type="hidden" name="save_post" value="<?php echo $postId; ?>"> 
                    <?php
                        $userPosts = implode(',', $userPosts);
                        if (strpos($userPosts, $postId) !== false) { ?>
                                <button disabled="disabled" type="submit" class="save_post disabled btn btn-outline-dark" data-toggle="tooltip" data-placement="top" title="già nei tuoi favoriti">Già nella box</button>
                                <button id="remove_post" name="remove_post" type="submit" class="save_post" data-toggle="tooltip" data-placement="top" title="aggiungilo alla tua box">Rimuovi dalla box</button>
                            <?php } else {   
                            ?>
                                <button id="save_post" name="save_post" type="submit" class="save_post" data-toggle="tooltip" data-placement="top" title="aggiungilo alla tua box">Salva nella box</button>
                        <?php  }
                    ?>
                </form>
            </div>
        </div>
    </div>
    <?php }
}
?>

标签： phpwordpress

Answer 1

get_user_meta 返回一个数组，因此不需要分解响应，但如果响应为空，它将被视为字符串。

在这里你应该改变这一行：

$userPosts = !empty(get_user_meta( $user_id, 'save_post', TRUE )) ？get_user_meta($user_id, 'save_post', TRUE): [];