www.gusucode.com > wordpress PHP博客系统英文版 v4.5.1PHP源码程序 > wordpress PHP博客系统英文版 v4.5.1/wordpress/wordpress/wp-includes/bookmark.php
<?php
/**
* Link/Bookmark API
*
* @package WordPress
* @subpackage Bookmark
*/
/**
* Retrieve Bookmark data
*
* @since 2.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int|stdClass $bookmark
* @param string $output Optional. Either OBJECT, ARRAY_N, or ARRAY_A constant
* @param string $filter Optional, default is 'raw'.
* @return array|object|null Type returned depends on $output value.
*/
function get_bookmark($bookmark, $output = OBJECT, $filter = 'raw') {
global $wpdb;
if ( empty($bookmark) ) {
if ( isset($GLOBALS['link']) )
$_bookmark = & $GLOBALS['link'];
else
$_bookmark = null;
} elseif ( is_object($bookmark) ) {
wp_cache_add($bookmark->link_id, $bookmark, 'bookmark');
$_bookmark = $bookmark;
} else {
if ( isset($GLOBALS['link']) && ($GLOBALS['link']->link_id == $bookmark) ) {
$_bookmark = & $GLOBALS['link'];
} elseif ( ! $_bookmark = wp_cache_get($bookmark, 'bookmark') ) {
$_bookmark = $wpdb->get_row($wpdb->prepare("SELECT * FROM $wpdb->links WHERE link_id = %d LIMIT 1", $bookmark));
if ( $_bookmark ) {
$_bookmark->link_category = array_unique( wp_get_object_terms( $_bookmark->link_id, 'link_category', array( 'fields' => 'ids' ) ) );
wp_cache_add( $_bookmark->link_id, $_bookmark, 'bookmark' );
}
}
}
if ( ! $_bookmark )
return $_bookmark;
$_bookmark = sanitize_bookmark($_bookmark, $filter);
if ( $output == OBJECT ) {
return $_bookmark;
} elseif ( $output == ARRAY_A ) {
return get_object_vars($_bookmark);
} elseif ( $output == ARRAY_N ) {
return array_values(get_object_vars($_bookmark));
} else {
return $_bookmark;
}
}
/**
* Retrieve single bookmark data item or field.
*
* @since 2.3.0
*
* @param string $field The name of the data field to return
* @param int $bookmark The bookmark ID to get field
* @param string $context Optional. The context of how the field will be used.
* @return string|WP_Error
*/
function get_bookmark_field( $field, $bookmark, $context = 'display' ) {
$bookmark = (int) $bookmark;
$bookmark = get_bookmark( $bookmark );
if ( is_wp_error($bookmark) )
return $bookmark;
if ( !is_object($bookmark) )
return '';
if ( !isset($bookmark->$field) )
return '';
return sanitize_bookmark_field($field, $bookmark->$field, $bookmark->link_id, $context);
}
/**
* 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 );
}
/**
* Sanitizes all bookmark fields
*
* @since 2.3.0
*
* @param object|array $bookmark Bookmark row
* @param string $context Optional, default is 'display'. How to filter the
* fields
* @return object|array Same type as $bookmark but with fields sanitized.
*/
function sanitize_bookmark($bookmark, $context = 'display') {
$fields = array('link_id', 'link_url', 'link_name', 'link_image', 'link_target', 'link_category',
'link_description', 'link_visible', 'link_owner', 'link_rating', 'link_updated',
'link_rel', 'link_notes', 'link_rss', );
if ( is_object($bookmark) ) {
$do_object = true;
$link_id = $bookmark->link_id;
} else {
$do_object = false;
$link_id = $bookmark['link_id'];
}
foreach ( $fields as $field ) {
if ( $do_object ) {
if ( isset($bookmark->$field) )
$bookmark->$field = sanitize_bookmark_field($field, $bookmark->$field, $link_id, $context);
} else {
if ( isset($bookmark[$field]) )
$bookmark[$field] = sanitize_bookmark_field($field, $bookmark[$field], $link_id, $context);
}
}
return $bookmark;
}
/**
* Sanitizes a bookmark field
*
* Sanitizes the bookmark fields based on what the field name is. If the field
* has a strict value set, then it will be tested for that, else a more generic
* filtering is applied. After the more strict filter is applied, if the
* $context is 'raw' then the value is immediately return.
*
* Hooks exist for the more generic cases. With the 'edit' context, the
* 'edit_$field' filter will be called and passed the $value and $bookmark_id
* respectively. With the 'db' context, the 'pre_$field' filter is called and
* passed the value. The 'display' context is the final context and has the
* $field has the filter name and is passed the $value, $bookmark_id, and
* $context respectively.
*
* @since 2.3.0
*
* @param string $field The bookmark field
* @param mixed $value The bookmark field value
* @param int $bookmark_id Bookmark ID
* @param string $context How to filter the field value. Either 'raw', 'edit',
* 'attribute', 'js', 'db', or 'display'
* @return mixed The filtered value
*/
function sanitize_bookmark_field($field, $value, $bookmark_id, $context) {
switch ( $field ) {
case 'link_id' : // ints
case 'link_rating' :
$value = (int) $value;
break;
case 'link_category' : // array( ints )
$value = array_map('absint', (array) $value);
// We return here so that the categories aren't filtered.
// The 'link_category' filter is for the name of a link category, not an array of a link's link categories
return $value;
case 'link_visible' : // bool stored as Y|N
$value = preg_replace('/[^YNyn]/', '', $value);
break;
case 'link_target' : // "enum"
$targets = array('_top', '_blank');
if ( ! in_array($value, $targets) )
$value = '';
break;
}
if ( 'raw' == $context )
return $value;
if ( 'edit' == $context ) {
/** This filter is documented in wp-includes/post.php */
$value = apply_filters( "edit_$field", $value, $bookmark_id );
if ( 'link_notes' == $field ) {
$value = esc_html( $value ); // textarea_escaped
} else {
$value = esc_attr($value);
}
} elseif ( 'db' == $context ) {
/** This filter is documented in wp-includes/post.php */
$value = apply_filters( "pre_$field", $value );
} else {
/** This filter is documented in wp-includes/post.php */
$value = apply_filters( $field, $value, $bookmark_id, $context );
if ( 'attribute' == $context ) {
$value = esc_attr( $value );
} elseif ( 'js' == $context ) {
$value = esc_js( $value );
}
}
return $value;
}
/**
* Deletes the bookmark cache.
*
* @since 2.7.0
*
* @param int $bookmark_id Bookmark ID.
*/
function clean_bookmark_cache( $bookmark_id ) {
wp_cache_delete( $bookmark_id, 'bookmark' );
wp_cache_delete( 'get_bookmarks', 'bookmark' );
clean_object_term_cache( $bookmark_id, 'link');
}