PHP internal link keyword replacement function

require_once (dirname(__FILE__).'/config.inc.php');
mysql_connect($cfg_db_host, $cfg_db_user, $cfg_db_password);
mysql_select_db( "$cfg_db_name ");
?>

$body = 'The world's largest Chinese search engine and largest Chinese website. Founded in Zhongguancun, Beijing in January 2000.
At the end of 1999, Robin Li, who was in Silicon Valley in the United States, saw the huge development potential of China’s Internet and Chinese search engine services. With the dream of changing the world through technology, he resolutely quit his high-paying job in Silicon Valley. With the patented search engine technology, he returned to China with Xu Yong and founded Baidu in Zhongguancun on January 1, 2000. It has grown from less than 10 people at the beginning to now, with more than 7,000 employees. Today, Baidu has become the most popular and influential Chinese website in China.
Baidu has thousands of R&D engineers, which is the best technical team in China and even the world. This team masters the most advanced search engine technology in the world, making Baidu the master of China. A Chinese high-tech enterprise with world-leading scientific and core technologies.
Since its inception, Baidu has regarded "allowing people to obtain information and find what they are looking for most conveniently" as its mission. Over the past 10 years, the company has adhered to the concept of "user-oriented". We have always insisted on responding to the needs of the majority of netizens and continuously provided netizens with various products based on search engines, including: functional search based on network search, community search based on Tieba, targeting various regions and industries. The required vertical search, MP3 search, portal channel, IM, etc., comprehensively cover all search needs in the Chinese online world. According to third-party authoritative data, Baidu's search share in China exceeds 70%.
While the search products for users are constantly enriched, search promotion to serve dynamic enterprises has emerged. For many years, abc has promoted abc through search, which has greatly promoted the survival and development of hundreds of thousands of small and medium-sized enterprises in China. Search promotion and Baidu promotion based on search promotion have also developed rapidly. Large enterprises, mainly global and China's top 500, carry out search promotion-based brand promotion on the Baidu search platform to create new opportunities for corporate brand and product promotion. Extraordinary benefits. At the same time, Baidu has responded to the demands of netizens in recent years and entered the C2C e-commerce field to provide netizens with more and better one-stop services.
In order to promote the development of millions of small and medium-sized websites in China, Baidu leverages its platform advantage of large traffic and unites all high-quality websites to establish the world's largest network alliance, enabling all types of enterprises to The value and coverage of search promotion and brand marketing have been greatly improved. At the same time, each website has the greatest chance of survival and development with the mutual help of the alliance family.
On August 5, 2005, Baidu was listed on NASDAQ in the United States. Not only did it become the most dazzling new star in the global capital market that year on the day of its listing, through its market performance over the past few years , its excellent performance and trustworthy returns have made it a representative of Chinese corporate value, standing proudly in the global capital market.
On January 23, 2008, Baidu Japan officially launched its internationalization strategy.

 Over the years, Baidu Chairman and CEO Robin Li has led Baidu people to form a core culture of "simple and reliable", which is deeply rooted in Baidu. cfg is a company full of vigor, pragmatism and honesty. It takes search to change lives, promote human civilization and progress, and promote the development of China's economy as its own mission, and is moving towards more ambitious goals. ';
/**
* Keyword replacement function, used to create internal links
* by bbs.it-home.org
*/
function ReplaceKeyword($body)
{
$body = preg_replace("/()(.*)()/isU", '\1-]-\4-[-\6', $body);
$sql="SELECT *
$body = preg_replace("/]*>( $key)/siU", "$key", $body);
$body = preg_replace("/$key/siU", "$key",$body);
$icount++;
$body = preg_replace("/()/isU" , '\1>\3return $body;
}