Tag API before 3.1

Moodle 2.0

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Tag API overview

The Tag API has been implemented in lib/moodlelib.php.

examplefunction()

Example function description.

Tag API Usage

Example

$id = mt_rand(1000000000, 9999999999); // Generating a key that is unlikely to be taken

tag_set('foo_user', $id, array()); // Delete all foo_user->$id tags by passing an empty array tag_get_tags('foo_user', $id); // returns an empty array()

tag_set_add('foo_user', $id, 'chess'); // Add chess to the list of tags for foo_user->$id tag_get_tags('foo_user', $id); /* returns: Array (

   [14] => stdClass Object
       (
           [id] => 14
           [tagtype] => default
           [name] => chess
           [rawname] => chess
           [flag] => 0
           [ordering] => 0
       )

)

• /

tag_set_delete('foo_user', $id, 'chess'); //Delete the chess tag for foo_user->$id tag_get_tags('foo_user', $id); // returns an empty array()

br(""); tag_set('foo_user', $id, array('table tennis', 'foosball', 'programming')); //Add some more tags for foo_user->$id $tags = tag_get_tags('foo_user', $id); /* $tags = Array (

   [15] => stdClass Object
       (
           [id] => 15
           [tagtype] => official
           [name] => table tennis
           [rawname] => table tennis
           [flag] => 0
           [ordering] => 0
       )

   [16] => stdClass Object
       (
           [id] => 16
           [tagtype] => default
           [name] => foosball
           [rawname] => foosball
           [flag] => 0
           [ordering] => 1
       )

   [17] => stdClass Object
       (
           [id] => 17
           [tagtype] => default
           [name] => programming
           [rawname] => programming
           [flag] => 0
           [ordering] => 2
       )

)

• /

$firstTagKey = key($tags); // Grab the first key (which happens to be the key for table tennis). tag_type_set($firstTagKey, 'official'); // Make table tennis an official tag // output only official foo_user->$id tags tag_get_tags('foo_user', $id, 'official'); /* Returns: Array (

   [15] => stdClass Object
       (
           [id] => 15
           [tagtype] => official
           [name] => table tennis
           [rawname] => table tennis
           [flag] => 0
           [ordering] => 0
       )

)

• /

// Set a description for the table tennis tag.

tag_description_set($firstTagKey, '

Another name for wiff-waff"

', FORMAT_HTML);

// Output a tag cloud for all tags in the system. tag_print_cloud();

Tag API database tables

Tag

This table holds all of the tags which are currently available in the system.

Field	Type	Default	Info
id	int(10)	auto-incrementing	The unique ID for this Tag.
userid	int(10)		The user that the Tag belongs to
name	varchar(255)	null
rawname	varchar(255)
tagtype	varchar(255) NULL	null
description	text NULL
descriptionformat	tinyint(2) unsigned	0
flag	smallint(4)	0
timemodified	bigint(10)

Tag_Instance

This table is use to record the instances of each tag's use. It has a many to one relationship with the tag table shown above.

Field	Type	Default	Info
id	int(10)	auto-incrementing	The unique ID for this Tag.
tagid	int(10)		The user that the Tag belongs to
itemtype	varchar(255)	null
itemid	int(10)
tiuserid	int(10)	0	???The userid of the user which owns the tag instance???
ordering	int(10)
timemodified	int(10)	0