输入为一个日期字符串，例如：2011-3-23

输出为举例当前的天数，例如：1

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代码为：

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    public static function convertDateToLong($dateStr){
        $checkPattern = "/^\d{4}(((-\d{1,2}){2})|((\.\d{1,2}){2})|((\/\d{1,2}){2}))$/";
        $date = substr(trim($dateStr),0,strpos(trim($dateStr)," ")>0 ? strpos(trim($dateStr)," ") : strlen(trim($dateStr)));
        if(preg_match($checkPattern,$date)){
            preg_match("/([-\/.])/",$date,$outer);
            $dilimeter = $outer[1];
            list($year,$month,$day) = explode($dilimeter,$date);
            if(checkdate($month,$day,$year)){
                $spsec = time()-mktime(0,0,0,$month,$day,$year);
                if($spsec < 0) throw new Exception("date can not be after today!!!");
                $spday = floor($spsec/24/60/60);
                return $spday;
            }
            else{
                throw new Exception("the date input is not a valid date");
            }
        }
        else{
            throw new Exception("the dateStr is wrong formatted!!!");
        }
    }