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  • WordPress函数get_bookmark()用法 获取所有链接

    描述:

    获取所有的链接(可设置筛选条件)

    用法:

    <?php
    $args = array(
    'orderby' => 'name',
    'order' => 'ASC',
    'limit' => - 1,
    'category' => '',
    'category_name' => '',
    'hide_invisible' => 1,
    'show_updated' => 0,
    'include' => '',
    'exclude' => '',
    'search' => ''
    ); ?>

    参数:

    orderby
    
    (string) 书签进行排序。默认为“name”。有效选项:
    
    'link_id' - ID
    'url'
    'name' - 默认
    'owner' - 通过书签管理器添加书签的用户。
    'rating'
    'visible'
    'length' - 书签名称的长度,从短到长。
    'rand' - 按随机顺序显示书签。
    order
    
    (string) 排序顺序,orderby参数的升序或降序。有效值:
    
    ASC - Default
    DESC
    limit
    
    (integer) 要显示的书签的最大数目。默认为-1(所有书签)。
    
    category
    
    (string) 书签类别ID的逗号分隔列表。
    
    category_name
    
    (string) 要检索的书签类别的类别名称。替代类别参数。
    
    hide_invisible
    
    (boolean) 如果为TRUE,则只检索链接可见设置为“Y”的书签。
    
    1 (True) - Default
    0 (False)
    show_updated
    
    (boolean) TRUE会导致在结果中插入一个名为“link_category_f”的额外列,该列包含与“link_updated”相同的值,但格式为unix时间戳。方便在此数据上使用PHP日期函数。
    
    1 (True)
    0 (False) - Default
    include
    
    (string) 要包含在输出中的数字书签ID的逗号分隔列表。例如,“include=1,3,6”表示返回或回显书签ID 1、3和6。如果使用包含字符串,则忽略类别、类别名称和排除参数。默认为“”(所有书签)。
    
    exclude
    
    (string) 要排除的数字书签ID的逗号分隔列表。例如,“exclude=4,12”表示书签IDs 4和12将不会返回或回显。默认为“”(不排除任何内容)。
    
    search
    
    (string) 像搜索字符串一样搜索链接url、链接名称或链接描述。默认为''。

    示例:

    <?php
    $bookmarks = get_bookmarks( array(
    'orderby' => 'name',
    'order' => 'ASC',
    'category_name' => 'Related Sites'
    ));
    
    // Loop through each bookmark and print formatted output
    foreach ( $bookmarks as $bookmark ) {
    printf( '<a class="relatedlink" href="%s">%s</a><br />', $bookmark->link_url, $bookmark->link_name );
    }
    ?>

    源文件:

    /**
    * Retrieves the list of bookmarks
    *
    * Attempts to retrieve from the cache first based on MD5 hash of arguments. If
    * that fails, then the query will be built from the arguments and executed. The
    * results will be stored to the cache.
    *
    * @since 2.1.0
    *
    * @global wpdb $wpdb WordPress database abstraction object.
    *
    * @param string|array $args {
    * Optional. String or array of arguments to retrieve bookmarks.
    *
    * @type string $orderby How to order the links by. Accepts post fields. Default 'name'.
    * @type string $order Whether to order bookmarks in ascending or descending order.
    * Accepts 'ASC' (ascending) or 'DESC' (descending). Default 'ASC'.
    * @type int $limit Amount of bookmarks to display. Accepts 1+ or -1 for all.
    * Default -1.
    * @type string $category Comma-separated list of category ids to include links from.
    * Default empty.
    * @type string $category_name Category to retrieve links for by name. Default empty.
    * @type int|bool $hide_invisible Whether to show or hide links marked as 'invisible'. Accepts
    * 1|true or 0|false. Default 1|true.
    * @type int|bool $show_updated Whether to display the time the bookmark was last updated.
    * Accepts 1|true or 0|false. Default 0|false.
    * @type string $include Comma-separated list of bookmark IDs to include. Default empty.
    * @type string $exclude Comma-separated list of bookmark IDs to exclude. Default empty.
    * }
    * @return array List of bookmark row objects.
    */
    function get_bookmarks( $args = '' ) {
    global $wpdb;
    
    $defaults = array(
    'orderby' => 'name', 'order' => 'ASC',
    'limit' => -1, 'category' => '',
    'category_name' => '', 'hide_invisible' => 1,
    'show_updated' => 0, 'include' => '',
    'exclude' => '', 'search' => ''
    );
    
    $r = wp_parse_args( $args, $defaults );
    
    $key = md5( serialize( $r ) );
    if ( $cache = wp_cache_get( 'get_bookmarks', 'bookmark' ) ) {
    if ( is_array( $cache ) && isset( $cache[ $key ] ) ) {
    $bookmarks = $cache[ $key ];
    /**
    * Filter the returned list of bookmarks.
    *
    * The first time the hook is evaluated in this file, it returns the cached
    * bookmarks list. The second evaluation returns a cached bookmarks list if the
    * link category is passed but does not exist. The third evaluation returns
    * the full cached results.
    *
    * @since 2.1.0
    *
    * @see get_bookmarks()
    *
    * @param array $bookmarks List of the cached bookmarks.
    * @param array $r An array of bookmark query arguments.
    */
    return apply_filters( 'get_bookmarks', $bookmarks, $r );
    }
    }
    
    if ( ! is_array( $cache ) ) {
    $cache = array();
    }
    
    $inclusions = '';
    if ( ! empty( $r['include'] ) ) {
    $r['exclude'] = ''; //ignore exclude, category, and category_name params if using include
    $r['category'] = '';
    $r['category_name'] = '';
    $inclinks = preg_split( '/[s,]+/', $r['include'] );
    if ( count( $inclinks ) ) {
    foreach ( $inclinks as $inclink ) {
    if ( empty( $inclusions ) ) {
    $inclusions = ' AND ( link_id = ' . intval( $inclink ) . ' ';
    } else {
    $inclusions .= ' OR link_id = ' . intval( $inclink ) . ' ';
    }
    }
    }
    }
    if (! empty( $inclusions ) ) {
    $inclusions .= ')';
    }
    
    $exclusions = '';
    if ( ! empty( $r['exclude'] ) ) {
    $exlinks = preg_split( '/[s,]+/', $r['exclude'] );
    if ( count( $exlinks ) ) {
    foreach ( $exlinks as $exlink ) {
    if ( empty( $exclusions ) ) {
    $exclusions = ' AND ( link_id <> ' . intval( $exlink ) . ' ';
    } else {
    $exclusions .= ' AND link_id <> ' . intval( $exlink ) . ' ';
    }
    }
    }
    }
    if ( ! empty( $exclusions ) ) {
    $exclusions .= ')';
    }
    
    if ( ! empty( $r['category_name'] ) ) {
    if ( $r['category'] = get_term_by('name', $r['category_name'], 'link_category') ) {
    $r['category'] = $r['category']->term_id;
    } else {
    $cache[ $key ] = array();
    wp_cache_set( 'get_bookmarks', $cache, 'bookmark' );
    /** This filter is documented in wp-includes/bookmark.php */
    return apply_filters( 'get_bookmarks', array(), $r );
    }
    }
    
    $search = '';
    if ( ! empty( $r['search'] ) ) {
    $like = '%' . $wpdb->esc_like( $r['search'] ) . '%';
    $search = $wpdb->prepare(" AND ( (link_url LIKE %s) OR (link_name LIKE %s) OR (link_description LIKE %s) ) ", $like, $like, $like );
    }
    
    $category_query = '';
    $join = '';
    if ( ! empty( $r['category'] ) ) {
    $incategories = preg_split( '/[s,]+/', $r['category'] );
    if ( count($incategories) ) {
    foreach ( $incategories as $incat ) {
    if ( empty( $category_query ) ) {
    $category_query = ' AND ( tt.term_id = ' . intval( $incat ) . ' ';
    } else {
    $category_query .= ' OR tt.term_id = ' . intval( $incat ) . ' ';
    }
    }
    }
    }
    if ( ! empty( $category_query ) ) {
    $category_query .= ") AND taxonomy = 'link_category'";
    $join = " INNER JOIN $wpdb->term_relationships AS tr ON ($wpdb->links.link_id = tr.object_id) INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_taxonomy_id = tr.term_taxonomy_id";
    }
    
    if ( $r['show_updated'] ) {
    $recently_updated_test = ", IF (DATE_ADD(link_updated, INTERVAL 120 MINUTE) >= NOW(), 1,0) as recently_updated ";
    } else {
    $recently_updated_test = '';
    }
    
    $get_updated = ( $r['show_updated'] ) ? ', UNIX_TIMESTAMP(link_updated) AS link_updated_f ' : '';
    
    $orderby = strtolower( $r['orderby'] );
    $length = '';
    switch ( $orderby ) {
    case 'length':
    $length = ", CHAR_LENGTH(link_name) AS length";
    break;
    case 'rand':
    $orderby = 'rand()';
    break;
    case 'link_id':
    $orderby = "$wpdb->links.link_id";
    break;
    default:
    $orderparams = array();
    $keys = array( 'link_id', 'link_name', 'link_url', 'link_visible', 'link_rating', 'link_owner', 'link_updated', 'link_notes', 'link_description' );
    foreach ( explode( ',', $orderby ) as $ordparam ) {
    $ordparam = trim( $ordparam );
    
    if ( in_array( 'link_' . $ordparam, $keys ) ) {
    $orderparams[] = 'link_' . $ordparam;
    } elseif ( in_array( $ordparam, $keys ) ) {
    $orderparams[] = $ordparam;
    }
    }
    $orderby = implode( ',', $orderparams );
    }
    
    if ( empty( $orderby ) ) {
    $orderby = 'link_name';
    }
    
    $order = strtoupper( $r['order'] );
    if ( '' !== $order && ! in_array( $order, array( 'ASC', 'DESC' ) ) ) {
    $order = 'ASC';
    }
    
    $visible = '';
    if ( $r['hide_invisible'] ) {
    $visible = "AND link_visible = 'Y'";
    }
    
    $query = "SELECT * $length $recently_updated_test $get_updated FROM $wpdb->links $join WHERE 1=1 $visible $category_query";
    $query .= " $exclusions $inclusions $search";
    $query .= " ORDER BY $orderby $order";
    if ( $r['limit'] != -1 ) {
    $query .= ' LIMIT ' . $r['limit'];
    }
    
    $results = $wpdb->get_results( $query );
    
    $cache[ $key ] = $results;
    wp_cache_set( 'get_bookmarks', $cache, 'bookmark' );
    
    /** This filter is documented in wp-includes/bookmark.php */
    return apply_filters( 'get_bookmarks', $results, $r );
    }
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