PHP automatically generates classes for keyword internal links

/**
* PHP automatically generates internal links for keywords
* by bbs.it-home.org
*/
include_once(dirname(__file__)."/../db/DBViewSpot.php" );
 class InnerLink{
 private static $spotUrlMap;
 /**
     * Generate view spots keywords link
     *
     * @param string $description
     * @param array $spotUrlMap
     * @return string
*/
 public static function genSpotLink($basePath, $description)
 {
 if(empty(InnerLink::$spotUrlMap)){
 InnerLink::$spotUrlMap = DBViewSpot::getSpotPare();
 }
 // Exclude irregular data
 if ( empty($description)) {
 return $description;
 }
 foreach (InnerLink::$spotUrlMap AS $spotUrlPair ){
 $replace = "".$spotUrlPair[0]."";
 // There are only text in the description, no pictures, so just pay attention to the a link
 $tmp1 = explode(" $is_replaced=false;
 foreach ($tmp1 as $key=>$item){
 $tmp2 = explode("",$item);
 if (sizeof($tmp2)> 1) {
 if (substr($tmp2[0],0,1)!="a" && substr($tmp2[0],0,1)!="A"){
 if ($is_replaced== =false) {
 $tmp2[1] = InnerLink::str_replace_once($spotUrlPair[0],$replace,$tmp2[1],$is_replaced);
 }
 $tmp1[$key] = implode("< /a>",$tmp2);
 }
 }else {
 if (is_string($item) && $is_replaced===false) {
 $tmp1[$key] = InnerLink::str_replace_once($spotUrlPair[0] ,$replace,$item,$is_replaced);
 }
 }
 }
 $description = implode(" }
 return $description;
 }
 /**
     * replace key word for one time
     *
     * @param string $needle
     * @param string $replace
     * @param string $haystack
     * @param bool $is_replaced
     * @return string
* /
 private static function str_replace_once($needle, $replace, $haystack,&$is_replaced) {
 $pos = strpos($haystack, $needle);
 if ($pos === false) {
 return $haystack;
 }
 $is_replaced=true;
 return substr_replace($haystack, $replace, $pos, strlen($needle));
 }
}