function drupal_explode_tags

Explodes a string of tags into an array.

See also

drupal_implode_tags()

File

includes/common.inc, line 7800

Code

function drupal_explode_tags($tags) {
    // This regexp allows the following types of user input:
    // this, "somecompany, llc", "and ""this"" w,o.rks", foo bar
    $regexp = '%(?:^|,\\ *)("(?>[^"]*)(?>""[^"]* )*"|(?: [^",]*))%x';
    preg_match_all($regexp, $tags, $matches);
    $typed_tags = array_unique($matches[1]);
    $tags = array();
    foreach ($typed_tags as $tag) {
        // If a user has escaped a term (to demonstrate that it is a group,
        // or includes a comma or quote character), we remove the escape
        // formatting so to save the term into the database as the user intends.
        $tag = trim(str_replace('""', '"', preg_replace('/^"(.*)"$/', '\\1', $tag)));
        if ($tag != "") {
            $tags[] = $tag;
        }
    }
    return $tags;
}