Okay, so I already have a script to let users enter tags but I want to let users enter multiple tags that are separated by a comma for example, (html, css, php) and store each tag in the database.
Is there a tutorial that can show me how to do this or can someone give me a couple of examples that i can work from.
Thanks
Assuming a schema like this:
The Post Tag table is what's called a join table for the many-to-many relationship from Post to Tag (because a Post can have multiple Tags and a Tag can be used on multiple Posts).
The user enters a list of tags separated by commas into an input field:
$tags = array_unique(array_map(explode(',', $POST['tags']), 'trim'));
and you have an array of tags the user entered. You may want to sanitize them further, like only allowing certain characters and/or converting them to lowercase.
Then your code becomes:
$post_id = ...
foreach ($tats as $tag) {
$tag = mysql_real_escape_string($tag);
$sql = <<<END
INSERT INTO PostTag (post_id, tag_id)
VALUES ($post_id, (SELECT id FROM Tag WHERE tag_name = '$tag'))
END;
mysql_query($sql);
}
Typically what you'd do for tag<->post mappings is have 1 table for tags, 1 table for posts, and then a third table which stores pairings between them:
tagid tagname
-------------
1 foo
2 bar
postid posttitle
-------------
1 test
2 beep
tagid postid
-------------
1 2
2 1
2 2
Would have two posts, where the first is tagged "bar" and the second is tagged "foo, bar"
explode() is probably the easiest way to parse the string.You could split a string of multiple tags using the PHP preg_split command, and then save each tag to the database as you do now.
The following code would split the string "html, css, php" into an array ["html", "css", "php"]:
$tag_string = "html, css, php";
$tags = preg_split("/[\s,]+/", $tag_string);
