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Filename : Slug.php
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<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

/**
 * CodeIgniter Slug Library
 *
  /**
 * Slug Library
 *
 * Nothing but legless, boneless creatures who are responsible for creating
 * magic "friendly urls" in your CodeIgniter application. Slugs are nocturnal
 * feeders, hiding during daylight hours.
 *
 * @subpackage Libraries
 */
class Slug {

    /**
     * The name of the table
     *
     * @var string
     */
    public $table = '';

    /**
     * The primary id field in the table
     *
     * @var string
     */
    public $id = 'id';

    /**
     * The URI Field in the table
     *
     * @var string
     */
    public $field = 'uri';

    /**
     * The title field in the table
     *
     * @var string
     */
    public $title = 'title';

    /**
     * The replacement (Either underscore or dash)
     *
     * @var string
     */
    public $replacement = 'dash';

    // ------------------------------------------------------------------------

    /**
     * Setup all vars
     *
     * @param array $config
     * @return void
     */
    public function __construct($config = array()) {
        $this->set_config($config);
        log_message('debug', 'Slug Class Initialized');
    }

    // ------------------------------------------------------------------------

    /**
     * Manually Set Config
     *
     * Pass an array of config vars to override previous setup
     *
     * @param   array
     * @return  void
     */
    public function set_config($config = array()) {
        if (!empty($config)) {
            foreach ($config as $key => $value) {
                $this->{$key} = $value;
            }
        }
    }

    // ------------------------------------------------------------------------

    /**
     * Create a uri string
     *
     * This wraps into the _check_uri method to take a character
     * string and convert into ascii characters.
     *
     * @param   mixed (string or array)
     * @param   int
     * @uses    Slug::_check_uri()
     * @uses    Slug::create_slug()
     * @return  string
     */
    public function create_uri($data = '', $id = '') {
        if (empty($data)) {
            return FALSE;
        }

        if (is_array($data)) {
            if (!empty($data[$this->field])) {
                return $this->_check_uri($this->create_slug($data[$this->field]), $id);
            } elseif (!empty($data[$this->title])) {
                return $this->_check_uri($this->create_slug($data[$this->title]), $id);
            }
        } elseif (is_string($data)) {
            return $this->_check_uri($this->create_slug($data), $id);
        }

        return FALSE;
    }

    // ------------------------------------------------------------------------

    /**
     * Create Slug
     *
     * Returns a string with all spaces converted to underscores (by default), accented
     * characters converted to non-accented characters, and non word characters removed.
     *
     * @param   string $string the string you want to slug
     * @param   string $replacement will replace keys in map
     * @return  string
     */
    public function create_slug($string) {
        $CI = & get_instance();
        $CI->load->helper(array('url', 'text', 'string'));
        $string = strtolower(url_title(convert_accented_characters($string), $this->replacement));
        return reduce_multiples($string, $this->_get_replacement(), TRUE);
    }

    // ------------------------------------------------------------------------

    /**
     * Check URI
     *
     * Checks other items for the same uri and if something else has it
     * change the name to "name-1".
     *
     * @param   string $uri
     * @param   int $id
     * @param   int $count
     * @return  string
     */
    private function _check_uri($uri, $id = FALSE, $count = 0) {
        $CI = & get_instance();
        $new_uri = ($count > 0) ? $uri . $this->_get_replacement() . $count : $uri;

        // Setup the query
        $CI->db->select($this->field)->where($this->field, $new_uri);

        if ($id) {
            $CI->db->where($this->id . ' !=', $id);
        }

        if ($CI->db->count_all_results($this->table) > 0) {
            return $this->_check_uri($uri, $id, ++$count);
        } else {
            return $new_uri;
        }
    }

    // ------------------------------------------------------------------------

    /**
     * Get the replacement type
     *
     * Either a dash or underscore generated off the term.
     *
     * @return string
     */
    private function _get_replacement() {
        return ($this->replacement === 'dash') ? '-' : '_';
    }

}