PHP array adds keyword links to articles and automatically adds links to article content_PHP tutorial

$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('webpage 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 are problems with my website. This has many problems for seo. seo is search engine optimization. I used to learn php well. Now I think jsp is good, css+div, web page , web design, web production, web learning, web teaching, Photoshop, Flash, HTML, CSS, Dreamweaver, Fireworks, ASP, PHP, JSP, ASP.NET, website construction, website development, web special effects, graphic design, personal website, Web page material";
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;
?>