PHP实现发送异步请求方法

1、方案一：使用CURL，但必须设置CUROPT_TIMEOUT为1。

function _curl($url, $data=null, $timeout=0, $isProxy=false){
    $curl = curl_init();
    if($isProxy){   //是否设置代理
        $proxy = "127.0.0.1";   //代理IP
        $proxyport = "8001";   //代理端口
        curl_setopt($curl, CURLOPT_PROXY, $proxy.":".$proxyport);
    }
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
    if(!empty($data)){
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        curl_setopt($curl, CURLOPT_HTTPHEADER, array(
                "cache-control: no-cache",
                "content-type: application/json",)
        );
    }
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
    if ($timeout > 0) { //超时时间秒
        curl_setopt($curl, CURLOPT_TIMEOUT, $timeout);
    }
    $output = curl_exec($curl);
    $error = curl_errno($curl);
    curl_close($curl);
    if($error){
        return false;
    }
    return $output;
}
_curl('http://localhost/index.php',null,1);

2、方案二：使用fsockopen，但需要自己拼出HTTP的header部分

function _fsockopen($url,$post_data=array(),$cookie=array()){
	$url_arr = parse_url($url);
	$port = isset($url_arr['port'])?$url_arr['port']:80;
	if($url_arr['scheme'] == 'https'){
		$url_arr['host'] = 'ssl://'.$url_arr['host'];
	}
	$fp = fsockopen($url_arr['host'],$port,$errno,$errstr,30);
	if(!$fp) return false;
	$getPath = isset($url_arr['path'])?$url_arr['path']:'/index.php';
	$getPath .= isset($url_arr['query'])?'?'.$url_arr['query']:'';
	$method = 'GET';  //默认get方式
	if(!empty($post_data)) $method = 'POST';
	$header = "$method  $getPath  HTTP/1.1\r\n";
	$header .= "Host: ".$url_arr['host']."\r\n";
	if(!empty($cookie)){  //传递cookie信息
		$_cookie = strval(NULL);
		foreach($cookie AS $k=>$v){
			$_cookie .= $k."=".$v.";";
		}
		$cookie_str = "Cookie:".base64_encode($_cookie)."\r\n";
		$header .= $cookie_str;
	}
	if(!empty($post_data)){  //传递post数据
		$_post = array();
		foreach($post_data AS $_k=>$_v){
			$_post[] = $_k."=".urlencode($_v);
		}
		$_post = implode('&', $_post);
		$post_str = "Content-Type:application/x-www-form-urlencoded; charset=UTF-8\r\n";
		$post_str .= "Content-Length: ".strlen($_post)."\r\n";  //数据长度
		$post_str .= "Connection:Close\r\n\r\n";
		$post_str .= $_post;  //传递post数据
		$header .= $post_str;
	}else{
		$header .= "Connection:Close\r\n\r\n";
	}
	fwrite($fp, $header);
	//echo fread($fp,1024);
	usleep(1000); // 这一句也是关键，如果没有这延时，可能在nginx服务器上就无法执行成功
	fclose($fp);
	return true;
}
_fsockopen('http://localhost/index.php'));

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