PHP获取远程文件大小　如果加判断文件大小以KB MB GB

<?php

function sizecount($filesize) {
if($filesize >= 1073741824) {
$filesize = round($filesize / 1073741824 * 100) / 100 . ' gb';
} elseif($filesize >= 1048576) {
$filesize = round($filesize / 1048576 * 100) / 100 . ' mb';
} elseif($filesize >= 1024) {
$filesize = round($filesize / 1024 * 100) / 100 . ' kb';
}
return $filesize;
}

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,$arr)){
return sizecount(trim($arr[1]));
}
}
return null;
}else{
return null;
}
}
//调用方法
echo getFileSize('http://bbs.phpchina.com/template/phpchina/image/common/logo.gif');

?>