<?php

$url = "http://www.homeforexchange.cn";

 

echo fopen_url($url);

function fopen_url($url) 

{ 

    if (function_exists('curl_init'))

    { 

        $curl_handle = curl_init(); 

        curl_setopt($curl_handle, CURLOPT_URL, $url); 

        curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT,2); 

        curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER,1); 

        curl_setopt($curl_handle, CURLOPT_FAILONERROR,1); 

        curl_setopt($curl_handle, CURLOPT_TIMEOUT,2);

        $file_content = curl_exec($curl_handle);

        $encode = mb_detect_encoding($file_content, array("ASCII","UTF-8","GB2312","GBK","BIG5"));       

        if($encode != "UTF-8")

        {

           $file_content = mb_convert_encoding($file_content, "UTF-8", $encode);

           //$file_content = iconv($encode,'utf-8//IGNORE',$file_content);

        }

        curl_close($curl_handle); 

    }

    else

    { 

        $file_content = ''; 

    } 

    return $file_content; 

}

?>

返回的数据中有：
<meta http-equiv="content-type" content="text/html;charset=gbk" />
根据他就可知道页面编码

没有时才需要编程判断
mb_detect_encoding 判断常有失误，所以又增加了 mb_check_encoding 函数