Summary of common methods for obtaining remote file size in PHP_PHP Tutorial

There are many ways to get the size of remote files in PHP. The most commonly used ones are fsockopen, file_get_contents, and curl functions. Let me summarize them for you. ​

1. fsockopen

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代码如下

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function getFileSize($url){ $url = parse_url($url); if($fp = @fsockopen($url['host'],empty($url['port'])?80:$url['port'],$error)){ fputs($fp,"GET ".(empty($url['path'])?'/':$url['path'])." HTTP/1.1rn"); fputs($fp,"Host:$url[host]rnrn"); while(!feof($fp)){ $tmp = fgets($fp); if(trim($tmp) == ''){ break; }else if(preg_match('/Content-Length:(.*)/si',$tmp,$arr)){ return trim($arr[1]); } } return null; }else{ return null; } } //调用方法 echo getFileSize("http://www.bkjia.comnet/") ?>

function getFileSize($url){

$url = parse_url($url);
if($fp = @fsockopen($url['host'],empty($url['port'])?80:$url['port'],$error)){

fputs($fp,"GET ".(empty($url['path'])?'/':$url['path'])." HTTP/1.1rn");

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$file = file_get_contents($url); echo strlen($file); ?>

fputs($fp,"Host:$url[host]rnrn");

while(!feof($fp)){

$tmp = fgets($fp);

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$header_array = get_headers($url, true); //返回结果 Array (     [0] => HTTP/1.1 200 OK     [Date] => Sat, 29 May 2004 12:28:14 GMT     [Server] => Apache/1.3.27 (Unix)  (Red-Hat/Linux)     [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT     [ETag] => "3f80f-1b6-3e1cb03b"     [Accept-Ranges] => bytes     [Content-Length] => 438     [Connection] => close     [Content-Type] => text/html )   $size = $header_array['Content-Length']; echo $size; ?>

if(trim($tmp) == ''){ break; }else if(preg_match('/Content-Length:(.*)/si',$tmp,$arr)){ return trim($arr[1]); } } return null; }else{ return null; } } //Call method echo getFileSize("http://www.bkjia.comnet/") ?>

2. Use file_get_contents()

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$file = file_get_contents($url); echo strlen($file); ?>

3. Use get_headers()

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$header_array = get_headers($url, true); //Return results Array ( [0] => HTTP/1.1 200 OK [Date] => Sat, 29 May 2004 12:28:14 GMT [Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux) [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT [ETag] => "3f80f-1b6-3e1cb03b" [Accept-Ranges] => bytes [Content-Length] => 438 [Connection] => close [Content-Type] => text/html ) $size = $header_array['Content-Length']; echo $size; ?>

4.curl

 代码如下

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代码如下

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function remote_filesize($uri,$user='',$pw='') {     // start output buffering     ob_start();     // initialize curl with given uri     $ch = curl_init($uri);     // make sure we get the header     curl_setopt($ch, CURLOPT_HEADER, 1);     // make it a http HEAD request     curl_setopt($ch, CURLOPT_NOBODY, 1);     // if auth is needed, do it here     if (!emptyempty($user) && !emptyempty($pw))     {         $headers = array('Authorization: Basic ' . base64_encode($user.':'.$pw));         curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);     }     $okay = curl_exec($ch);     curl_close($ch);     // get the output buffer     $head = ob_get_contents();     // clean the output buffer and return to previous     // buffer settings     ob_end_clean();       echo ' head-->'.$head.'<----end '; // gets you the numeric value from the Content-Length // field in the http header $regex = '/Content-Length:s([0-9].+?)s/'; $count = preg_match($regex, $head, $matches); // if there was a Content-Length field, its value // will now be in $matches[1] if (isset($matches[1])) { $size = $matches[1]; } else { $size = 'unknown'; } //$last=round($size/(1024*1024),3); //return $last.' MB'; return $size; }

function remote_filesize($uri,$user='',$pw='')
{
    // start output buffering
    ob_start();
    // initialize curl with given uri
    $ch = curl_init($uri);
    // make sure we get the header
    curl_setopt($ch, CURLOPT_HEADER, 1);
    // make it a http HEAD request
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    // if auth is needed, do it here
    if (!emptyempty($user) && !emptyempty($pw))
    {
        $headers = array('Authorization: Basic ' . base64_encode($user.':'.$pw));
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    }
    $okay = curl_exec($ch);
    curl_close($ch);
    // get the output buffer
    $head = ob_get_contents();
    // clean the output buffer and return to previous
    // buffer settings
    ob_end_clean();
 
    echo '
head-->'.$head.'<----end
';
 
    // gets you the numeric value from the Content-Length
    // field in the http header
    $regex = '/Content-Length:s([0-9].+?)s/';
    $count = preg_match($regex, $head, $matches);
 
    // if there was a Content-Length field, its value
    // will now be in $matches[1]
    if (isset($matches[1]))
    {
        $size = $matches[1];
    }
    else
    {
        $size = 'unknown';
    }
    //$last=round($size/(1024*1024),3);
    //return $last.' MB';
    return $size;
}

http://www.bkjia.com/PHPjc/445618.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/445618.htmlTechArticlephp有很多方法可以获取远程文件大小的哦，最常用的就有fsockopen、file_get_contents、curl函数哦，下面我来给各位总结一下。 1、fsockopen 代码如...