PHP - 查询结果转字符串

function strQuery($sql){
    $sql = mysql_query($sql);
    $resule = array();
    while($row = mysql_fetch_assoc($sql)){
        $result[] = $row;
    }
    $str = "";
    foreach($result as $key => $val){
        $str = $str.implode("-", $val)."|"; 
    }
    $data = substr($str, 0, strlen($str)-1);
    return $data;
}