how to get bing backlinks using php

hello
i have little roblem with my php code to me its seems to be ok but its not working

function bing_backs($url){      // to get backilinks
    $url = "http://www.bing.com/search?q=link%3A$url";
    $total = file_get_contents($url);
    $match_expression = '/<span class="sb_count" id="count">(.*?)<\\/span><\/div>/im'; 
   // preg_match($match_expression,$total,$matches); 
    preg_match_all($match_expression, $total, $matches);
    echo $n_clean=$matches[1];  
    return $n_clean=clean_me($n_clean); 
} 
function clean_me($numb){    // to clean the reutrn numbers remove coma (,) etc
return $clean_num=str_replace(",", "", $numb);
}



$url="www.youtube.com";
echo bing_backs($url);   // not working regex seems to be ok to me

[Squidge]

Can you explain?

How is it not working?

Are you getting an error?

Is anything showing in your log files?

it simply print word array ..... i test regex expression its correct so it shuld return digits but it cant return