方法1: 用file_get_contents 以get方式获取内容
  
<?php
$url='http://www.domain.com/';
$html = file_get_contents($url);
echo $html;
?>

方法2: 用fopen打开url, 以get方式获取内容

    
<?php  
$fp = fopen($url, 'r');  
//返回请求流信息（数组：请求状态，阻塞，返回值是否为空，返回值http头等）
stream_get_meta_data($fp);  
while(!feof($fp)) {  
$result .= fgets($fp, 1024);  
}  
echo "url body: $result";  
fclose($fp);  
?>

方法3：用file_get_contents函数,以post方式获取url

    
<?php  
$data = array ('foo' => 'bar');
//生成url-encode后的请求字符串，将数组转换为字符串  
$data = http_build_query($data);  
$opts = array (  
<span style="white-space:pre">  </span>'http' => array (  
<span style="white-space:pre">      </span>'method' => 'POST',  
<span style="white-space:pre">      </span>'header'=> "Content-type: application/x-www-form-urlencoded\r\n" .  
<span style="white-space:pre">      </span>"Content-Length: " . strlen($data) . "\r\n",  
<span style="white-space:pre">      </span>'content' => $data  
<span style="white-space:pre">  </span>)  
);
//生成请求的句柄文件  
$context = stream_context_create($opts);  
$html = file_get_contents('http://localhost/e/admin/test.html', false, $context);  
echo $html;  
?>

方法4：用fsockopen函数打开url，以get方式获取完整的数据，包括header和body,fsockopen需要 PHP.ini 中 allow_url_fopen 选项开启

    
    <?php  
    function get_url ($url,$cookie=false)  
    {  
    $url = parse_url($url);  
    $query = $url[path]."?".$url[query];  
    echo "Query:".$query;  
    $fp = fsockopen( $url[host], $url[port]?$url[port]:80 , $errno, $errstr, 30);  
    if (!$fp) {  
    return false;  
    } else {  
    $request = "GET $query HTTP/1.1\r\n";  
    $request .= "Host: $url[host]\r\n";  
    $request .= "Connection: Close\r\n";  
    if($cookie) $request.="Cookie:   $cookie\n";  
    $request.="\r\n";  
    fwrite($fp,$request);  
    while()) {  
    $result .= @fgets($fp, 1024);  
    }  
    fclose($fp);  
    return $result;  
    }  
    }  
    //获取url的html部分，去掉header  
    function GetUrlHTML($url,$cookie=false)  
    {  
    $rowdata = get_url($url,$cookie);  
    if($rowdata)  
    {  
    $body= stristr($rowdata,"\r\n\r\n");  
    $body=substr($body,4,strlen($body));  
    return $body;  
    }  
        return false;  
    }  
    ?>

方法5：用fsockopen函数打开url，以POST方式获取完整的数据，包括header和body
    
    <?php  
    function HTTP_Post($URL,$data,$cookie, $referrer="")  
    {  
        // parsing the given URL  
    $URL_Info=parse_url($URL);  
        // Building referrer  
    if($referrer=="") // if not given use this script as referrer  
    $referrer="111";  
        // making string from $data  
    foreach($data as $key=>$value)  
    $values[]="$key=".urlencode($value);  
    $data_string=implode("&",$values);  
        // Find out which port is needed - if not given use standard (=80)  
    if(!isset($URL_Info["port"]))  
    $URL_Info["port"]=80;  
        // building POST-request:  
    $request.="POST ".$URL_Info["path"]." HTTP/1.1\n";  
    $request.="Host: ".$URL_Info["host"]."\n";  
    $request.="Referer: $referer\n";  
    $request.="Content-type: application/x-www-form-urlencoded\n";  
    $request.="Content-length: ".strlen($data_string)."\n";  
    $request.="Connection: close\n";  
        $request.="Cookie:   $cookie\n";  
        $request.="\n";  
    $request.=$data_string."\n";  
        $fp = fsockopen($URL_Info["host"],$URL_Info["port"]);  
    fputs($fp, $request);  
    while(!feof($fp)) {  
    $result .= fgets($fp, 1024);  
    }  
    fclose($fp);  
        return $result;  
    }  
    ?>

方法6:使用curl库，使用curl库之前，可能需要查看一下php.ini是否已经打开了curl扩展
  
<?php  
$ch = curl_init();  
$timeout = 5;  
curl_setopt ($ch, CURLOPT_URL, 'http://www.domain.com/');  
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);  
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);  
$file_contents = curl_exec($ch);  
curl_close($ch);  
echo $file_contents;  
?>