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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