通过url获取图片、视频、json、html文件的大小

使用fsockopen() - 已尝试

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/1.1\r\n");
  fputs($fp,"Host:$url[host]\r\n\r\n");
  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;
 }
}

注意，返回的是字节，如果需要转化:

kb：ceil($size / 1024)

m: ceil($size / 1024 / 1024)

以下是同样的方法，另一种封装：

<?php
 function get_file_size($url) {
     $url = parse_url($url);

     if (empty($url['host'])) {
         return false;
     }

     $url['port'] = empty($url['post']) ? 80 : $url['post'];
     $url['path'] = empty($url['path']) ? '/' : $url['path'];

     $fp = fsockopen($url['host'], $url['port'], $error);

     if($fp) {
         fputs($fp, "GET " . $url['path'] . " HTTP/1.1\r\n");
         fputs($fp, "Host:" . $url['host']. "\r\n\r\n");

         while (!feof($fp)) {
             $str = fgets($fp);
             if (trim($str) == '') {
                 break;
             }elseif(preg_match('/Content-Length:(.*)/si', $str, $arr)) {
                 return trim($arr[1]);
             }
         }
         fclose ( $fp);
         return false;
     }else {
         return false;
     }
 }
 ?>

使用file_get_contents()

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

使用get_headers()

<?php
$header_array = get_headers($url, true);
$size = $header_array['Content-Length'];
echo $size;
?>

需要打开allow_url_fopen!如未打开会显示Warning: get_headers() [function.get-headers]: URL file-access is disabled in the server configuration

使用curl 来获取远程文件大小

// 获取远程文件大小函数
function remote_filesize($url, $user = "", $pw = "")
{
    ob_start();
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
 
    if(!empty($user) && !empty($pw))
    {
        $headers = array('Authorization: Basic ' .  base64_encode("$user:$pw"));
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    }
 
    $ok = curl_exec($ch);
    curl_close($ch);
    $head = ob_get_contents();
    ob_end_clean();
 
    $regex = '/Content-Length:\s([0-9].+?)\s/';
    $count = preg_match($regex, $head, $matches);
 
    return isset($matches[1]) ? $matches[1] . " 字节" : "unknown";
}

实例测试

// 实例测试
echo remote_filesize("https://634174214.gitee.io/myblog-www-assets/img/blog-logo.png");

返回的结果是字节