Question

Can some one explain me what is going on in these 3 functions please?

public function normalizeTags($attribute,$params)
{
    $this->tag=Tag::array2string(array_unique(Tag::string2array($this->tag)));
}

public static function string2array($tags)
{
    return preg_split('/\s*,\s*/',trim($tags),-1,PREG_SPLIT_NO_EMPTY);
}

public static function array2string($tags)
{
    return implode(', ',$tags);
}

Answer 1

Splitting an array of tags, filtering duplicate records and returning it to string.

• Splitting an array of tags: using regular expression like “string,
  string”
• filtering: array_unique
• returning it to string: implode