ave-cms/class/class.meta.php

<?php

/**
 * AVE.cms
 *
 * @package AVE.cms
 * @version 3.x
 * @filesource
 * @copyright © 2007-2014 AVE.cms, http://www.ave-cms.ru
 *
 */

class Meta
{
	private $_keyword_count = 10;

	public function __construct($keyword_count = false)
	{
		if ((int)$keyword_count)
			$this->_keyword_count = $keyword_count;
	}

	public function setKeywordCount($keyword_count)
	{
		if ((int)$keyword_count)
			$this->_keyword_count = $keyword_count;
	}

	public function generateMeta($text)
	{
		$newarr = array ();

		$quotes = array ("\x22", "\x60", "\t", "\n", "\r", ",", "/", "¬", "#", ";", ":", "@", "~", "[", "]", "{", "}", "=", "+", ")", "(", "*", "^", "%", "$", "<", ">", "?", "!", '"');
		$fastquotes = array ("\x22", "\x60", "\t", "\n", "\r", '"', "\\", '\r', '\n', "/", "{", "}", "[", "]" );

		$text = str_replace( chr(9), ' ', $text );
		$text = str_replace( chr(10), ' ', $text );
		$text = str_replace( chr(13), ' ', $text );
		$text = str_replace( "&nbsp;", " ", $text );
		$text = str_replace( '<br />', ' ', $text );
		$text = strip_tags( $text );
		$text = preg_replace('/ {2,}/',' ',$text);
		$text = preg_replace( "#&(.+?);#", "", $text );
		//$text = trim(str_replace( " ,", "", stripslashes( $text )));
		$text = preg_replace('/\[tag:(.+?)\]/', '', $text);
		$text = preg_replace('/\[mod_(.+?)\]/', '', $text);

		$text = str_replace( $fastquotes, '', $text );

		$text = str_replace( $quotes, ' ', $text );

		$arr = explode( " ", $text );

		foreach ($arr as $word)
		{
			if (mb_strlen(($word)) > 4 OR (mb_strtoupper($word) == $word) and mb_strlen(($word)) > 1)
				$newarr[] = $word;
		}

		$arr = array_count_values($newarr);

		arsort($arr);

		$arr = array_keys($arr);

		// Не используется
		// $total = count($arr);

		$offset = 0;

		$arr = array_slice($arr, $offset, $this->_keyword_count);

		$return['keywords'] = implode( ", ", $arr );
		$return['description'] = trim(mb_substr( trim($text), 0, 220 ),'.').'.';

		return $return;
	}
}