PHP: Array Add keyword links to articles, like 163 article content, automatically add link effects

PHP: Array Add keyword links to articles, like 163 article content, automatically add link effects

$keys =array(
 array('Web page effects','/js_a/js.html'),
 array('seo','/seo/seo.html'),
 array('php','/phper/php.html'),
 array('jsp','/jsp/jsp.html'),
 array('asp','/asp/asp.html'),
 array('ps','/fw/photo.html'),
 array('photoshop','/fw/photo.html'),
 array('javascript','/js_a/js.html') ,
 array('.net','/net/net.html'),
 array('non-mainstream','/fw/photo.html'),
 array('network','/mon/mon. html'),
 array('css','/cssdiv/css.html'),
 array('graphic design','/fw/photo.html'),
 array('website','/person/ '),
 array('Web page production','/wy/yw.html'),
 array('Search engine','/seo/seo.html'),
 array('Optimization','/seo/ seo.html'),
 array('animation','/flash_a/flash.html'),
 array('database','/database/database.html'),
 array('make money','/ mon/mon.html'),
 array('Operation','/mon/mon.html')

);

$str = "Today is May 30, 2010. There is a problem with my website. There are many questions about seo. seo is search engine optimization. I used to learn php, but now I think jsp is better, css+div, web page, web design, web page production, web page learning, web page teaching, Photoshop, Flash, HTML, CSS, Dreamweaver,Fireworks,ASP,PHP,JSP,asp.net,website construction,website development,webpage special effects,graphic design,personal website,webpage materials";


echo $str,"";
foreach( $keys as $nkeys){
 //print_r($nkeys);echo"";
 //foreach( $nkeys as $join) {
 //echo($join)," ";
 if(strpos($str,$nkeys[0]) ){
 $str =str_replace($nkeys[0],"".$nkeys[0]."",$str);
 }
 //}
}

 echo $str;
?>