一、get_header($url,true)：

$url = ‘‘; $res = get_headers($url,true); echo "<pre>"; print_R($res); die; $filesize = round($res[‘Content-Length‘]/1024/1024,2);//四舍五入获取文件大小，单位M

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二、curl：

$url = ‘‘; echo getFileSize($url);die;//71741458 function getFileSize($url,$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); } $okay = curl_exec($ch); curl_close($ch); $head = ob_get_contents(); ob_end_clean(); //echo ‘<br>head-->‘.$head.‘<----end <br>‘; $regex = ‘/Content-Length:\s([0-9].+?)\s/‘; $count = preg_match($regex, $head, $matches); $size = isset($matches[1])?$matches[1]:‘unknown‘; //$last=round($size/(1024*1024),3); //return $last.‘ MB‘; return $size; }

三、fsockopen：

$url = ‘‘; echo getFileSize($url);die; 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($tmp) == ‘‘) { break; } elseif(preg_match(‘/Content-Length:(.*)/si‘,$tmp,$arr)) { return trim($arr[1]); } } return null; } else { return null; } }

filesize()，只能获取本地文件大小，不能获取远程文件大小：

$url = ‘./v3.rar‘;// 获取本地文件 $url =‘‘;//获取远程文件 echo filesize($url);

file_get_contents(),获取文件内容，strlen()获取内容大小：

PHP获取文件大小的几种方法!

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