php远程获取图片或文件信息(get_headers, fsocketopen, curl)

<?php
if(!function_exists("remote_filesize")){
    /**
     * 获取远程或本地文件信息
     * @param  string   $strUrl     远程文件或本地文件地址
     * @param  integer  $intType    调用方式(1:get_headers 2:fsocketopen 3:curl 4:本地文件)
     * @param  array    $arrOptional
     * @return array
     * @author mengdj<mengdj@outlook.com>
     */
    function remote_filesize($strUrl,$intType=1,$arrOptional=array()){
        $arrRet=array(
            "length"=>0,                    //大小，字节为单位
            "mime"=>"",                     //mime类型
            "filename"=>"",                 //文件名
            "status"=>0                     //状态码
        );
        switch($intType){
            case 1:
                //利用get_headers函数
                if(($arrTmp=get_headers($strUrl,true))){
                    $arrRet=array("length"=>$arrTmp['Content-Length'],"mime"=>$arrTmp['Content-Type']);
                    if(preg_match('/filename=\"(.*)\"/si',$arrTmp['Content-Disposition'],$arr)){
                        $arrRet["filename"]=$arr[1];
                    }
                    if(preg_match('/\s(\d+)\s/',$arrTmp[0],$arr)){
                        $arrRet["status"]=$arr[1];
                    }
                }
                break;
            case 2:
                //利用fsocket
                if(($arrUrl=parse_url($strUrl))){
                    if($fp=@fsockopen($arrUrl['host'],empty($arrUrl['port'])?80:$arrUrl['port'],$error)){
                        @fputs($fp,"GET ".(empty($arrUrl['path'])?'/':$arrUrl['path'])." HTTP/1.1\r\n");
                        @fputs($fp,"Host: $arrUrl[host]\r\n");
                        @fputs($fp,"Connection: Close\r\n\r\n");
                        while(!feof($fp)){
                            $tmp=fgets($fp);
                            if(trim($tmp)==''){
                                //此行代码只读到头信息即可
                                break;
                            }else{
                                (preg_match('/(HTTP.*)(\s\d{3}\s)/',$tmp,$arr))&&$arrRet['status']=trim($arr[2]);
                                (preg_match('/Content-Length:(.*)/si',$tmp,$arr))&&$arrRet['length']=trim($arr[1]);
                                (preg_match('/Content-Type:(.*)/si',$tmp,$arr))&&$arrRet['mime']=trim($arr[1]);
                                (preg_match('/filename=\"(.*)\"/si',$tmp,$arr))&&$arrRet['filename']=trim($arr[1]);
                            }
                        }
                        @fclose($fp);
                    }
                }
                break;
            case 3:
                //利用curl
                if(($ch=curl_init($strUrl))){
                    curl_setopt($ch,CURLOPT_HEADER,1);
                    curl_setopt($ch,CURLOPT_NOBODY,1);
                    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
                    if(isset($arrOptional['user'])&&isset($arrOptional['password'])){
                        $headers=array('Authorization: Basic '.base64_encode($arrOptional['user'].':'.$arrOptional['password']));
                        curl_setopt($ch,CURLOPT_HTTPHEADER,$headers);
                    }
                    $tmp=curl_exec($ch);
                    curl_close($ch);
                    (preg_match('/Content-Length:\s([0-9].+?)\s/',$tmp,$arr))&&$arrRet['length']=trim($arr[1]);
                    (preg_match('/Content-Type:\s(.*)\s/',$tmp,$arr))&&$arrRet['mime']=trim($arr[1]);
                    (preg_match('/filename=\"(.*)\"/i',$tmp,$arr))&&$arrRet['filename']=trim($arr[1]);
                    (preg_match('/(HTTP.*)(\s\d{3}\s)/',$tmp,$arr))&&$arrRet['status']=trim($arr[2]);
                }
                break;
            case 4:
                //本地处理
                if(file_exists($strUrl)) {
                    $arrRet=array(
                        "length"=>filesize($strUrl),
                        "mime" =>mime_content_type($strUrl),
                        "filename"=>basename($strUrl),
                        "status"=>200
                    );
                }else{
                    $arrRet=array(
                        "length"=>0,
                        "mime" =>'',
                        "filename"=>basename($strUrl),
                        "status"=>404
                    );
                }
                break;
        }
        if(isset($arrOptional['getimagesize'])&&$arrRet['status']=='200'){
            if(($arrTmp=@getimagesize($strUrl))){
                $arrRet['width']=$arrTmp[0];
                $arrRet['height']=$arrTmp[1];
                $arrRet['type']=$arrTmp[2];
                $arrRet['tag']=$arrTmp[3];
                $arrRet['bits']=$arrTmp['bits'];
                $arrRet['channels']=$arrTmp['channels'];
                !isset($arrRet['mime'])&&$arrRet['mime']=$arrTmp['mime'];
            }
        }
        return $arrRet;
    }
}