Relevancy Algorythym

Hi
This is a script which combines many different video feeds together, at the moment you can see that it

shuffle($all);

PHP:

instead of an algorithm to sort the records, i would like to change it so that it is sorted by relevancy to a string which i could specify. Here is the whole code for the page, and bellow that is an algoryhtym which i tried to implement into the code but would not work. Can anyone either help me implement this algorithm or write one that will work with this code?

<?
function getall($searchterms) {
	require("yt.php");
	require("gv.php");
	require("dm.php");
	require("mc.php");
	
	$yt = yt($searchterms);
	$gv = gv($searchterms);
	$dm = dm($searchterms);
	$mc = mc($searchterms);
	
	$all = array_merge($yt,$gv,$dm,$mc);
	if(count($all)) {
		include_once "latest.php";
		updatelatest(str_replace("+","-",$searchterms));	
	}
	$bannedwords = "bannedwords.txt";
	$fp = fopen($bannedwords, "r");
	$wordstmp = fread($fp, filesize($bannedwords));
	fclose($fp);
	$words = explode("\n",$wordstmp);
	$words = array_map("strtolower",$words);
	
	foreach($all as $index=>$arr) {
		$arrtitle = $arr['title'];
		foreach($words as $index2=>$word) {
			if(strstr(strtolower($arrtitle),strtolower(str_replace("\n","",str_replace("\r","",$word))))) {
				unset($all[$index]);
				break;	
			}
		}
	}
	
	srand((float)microtime() * 1000000);
	shuffle($all);
	foreach($all as $j=>$k) {
		if(!trim($k['title'])||!trim($k['link']))
			unset($all[$j]);	
	}

	return $all;	
}

?>

PHP:

This is the sort of algorythym

usort($multifeed,'funnySort');

function funnySort($a,$b)
{
    // assign numerical value so we can sort on 
        // whether "term" is in title or content or neither

    $term = 'funny';

    $x = 0;    
    if (stripos($a->get_title(),$term))
        $x = 2;
    elseif (stripos($a->get_content(),$term))
        $x = 1;

    $y = 0;    
    if (stripos($b->get_title(),$term))
        $y = 2;
    elseif (stripos($b->get_content(),$term))
        $y = 1;

    return $x <= $y
}

PHP:

i also tried to use this code on this site http://www.webmastersherpa.com/tools/search.txt


Please can someone either help me adapt either of these algorithms or help me write one that will work with my code.

 

i'm not sure your exact setup but I've read that mysql can do some pretty cool text relevancy functions. This problem might be much easier solved at the database level.