使用PHP的`XMLHttpRequest`函数向服务器发送HTTP请求并获取数据的示例代码

发布时间：2023-08-10 13:08:47 所属栏目：PHP教程来源：

导读：类名:httprequest($url="",$method="get",$usesocket=0)

$url为请求的地址；默认请求方法为get；$usesocket默认为0，使用fsockopen方法，如果设置为1则使用socket_create方法

方法:

open($ip="",$port=-1)

类名:httprequest($url="",$method="get",$usesocket=0)

$url为请求的地址；默认请求方法为get；$usesocket默认为0，使用fsockopen方法，如果设置为1则使用socket_create方法

方法:

open($ip="",$port=-1) //打开同服务器的连接,默认不用设置这两个参数（一个同事在linux用的时候,请求的不是hostname解析的ip,因此加了这两个参数,以连接真实的服务器ip）

settimeout($timeout=0) //设置获取数据的超时时间,必须在send方法调用之前设置才有效,单位秒,默认值0为不限制

setrequestheader($key,$value="") //设置请求头,必须在send方法调用之前设置才有效

removerequestheader($key,$value="") //移除指定键值的请求头,必须在send方法调用之前调用才有效

send($data="") //发送数据$data到服务器

getresponsebody() //获取服务器返回的文本

getallresponseheaders() //获取服务器响应的所有头信息

getresponseheader($key) //获取服务器响应的某个头信息,例如server,set_cookie等

属性:

$url //要请求的url

$method //请求方法(post/get)

$port //请求的端口

$hostname //请求的主机名

$uri //url的文件部分

$protocol //请求协议(http)(包括本属性的以上5个属性均由程序自动通过url分析)

$excption //异常信息

$_headers=array() //请求头array("key"=>"value")

$_senddata //发送到服务器的数据

$status //返回的状态码

$statustext //状态信息

$httpprotocolversion //服务器的http协议版本

注意:

host头由程序自动设置，当用post方法请求时,content-length和content-type已被自动设置.

支持gzip压缩的页面,inc.http.php文件代码如下:

<?php
class httprequest{
public $url,$method,$port,$hostname,$uri,$protocol,$excption,$_headers=array(),$_senddata,$status,$statustext,$httpprotocolversion;
private $fp=0,$_buffer="",$responsebody,$responseheader,$timeout=0,$usesocket;
//构造函数
function __construct($url="",$method="get",$usesocket=0){
$this->url = $url;
$this->method = strtoupper($method);
$this->usesocket = $usesocket;
$this->setrequestheader("accept","*/*");
$this->setrequestheader("accept-language","zh-cn");
$this->setrequestheader("accept-encoding","gzip, deflate");
$this->setrequestheader("user-agent","httprequest class 1.0"); //可调用setrequestheader来修改
}

//连接服务器
public function open($ip="",$port=-1){
if(!$this->_geturlinfo()) return false;
$this->setrequestheader("host",$this->hostname);
$this->setrequestheader("connection","close");
$ip = ($ip=="" ? $this->hostname : $ip);
$port = ($port==-1 ? $this->port : $port);
if($this->usesocket==1){
if(!$this->fp=$socket=socket_create(af_inet,sock_stream,0)) {
$this->excption="can not create socket";return false;
}else{
if(!socket_connect($this->fp,$ip, $port) ){
$this->excption="can not connect to server " . $this->hostname . " on port" . $this->port;return false;
}
}
}else{
if(!$this->fp=fsockopen($ip, $port,$errno,$errstr,10)) {
$this->excption="can not connect to server " . $this->hostname . " on port" . $this->port;return false;
}
}
return true;
}

public function send($data=""){
if(!$this->fp){$this->excption="is not a resource id";return false;}
if($this->method=="get" && $data!=""){
$s_str="?";
if(strpos($this->uri,"?")>0) $s_str = "&";
$this->uri.= $s_str . $data;
$data="";
}
$senddata=$this->method . " " . $this->uri . " http/1.1rn";
if($this->method=="post"){
$this->setrequestheader("content-length",strlen($data));
$this->setrequestheader("content-type", "application/x-www-form-urlencoded");
}
foreach($this->_headers as $keys => $value){
$senddata .= "$keys: $valuern";
}
$senddata .= "rn";
if($this->method=="post") $senddata .= $data;
$this->_senddata = $senddata;
if($this->usesocket==1){
socket_write($this->fp,$this->_senddata);
$buffer="";
$timestart = time();
do{
if($this->timeout>0){
if(time()-$timestart>$this->timeout){break;}
}
$this->_buffer.=$buffer;
$buffer = socket_read($this->fp,4096);
}while($buffer!="");
socket_close($this->fp);
}else{
fputs($this->fp, $senddata);
$this->_buffer="";
$timestart = time();
while(!feof($this->fp))
{
if($this->timeout>0){
if(time()-$timestart>$this->timeout){break;}
}
$this->_buffer.=fgets($this->fp,4096);
}
fclose($this->fp);
}
$this->_splitcontent();
$this->_getheaderinfo();
}

public function getresponsebody(){
if($this->getresponseheader("content-encoding")=="gzip" && $this->getresponseheader("transfer-encoding")=="chunked"){
return gzdecode_1(transfer_encoding_chunked_decode($this->responsebody));
}else if($this->getresponseheader("content-encoding")=="gzip"){
return gzdecode_1($this->responsebody);
}else{
return $this->responsebody;
}
}

public function getallresponseheaders(){
return $this->responseheader;
}

public function getresponseheader($key){
$key = str_replace("-","-",$key);
$headerstr = $this->responseheader . "rn";
$count = preg_match_all("/n$key:(.+?)r/is",$headerstr,$result,preg_set_order);
if($count>0){
$returnstr="";
foreach($result as $key1=>$value){
if(strtoupper($key)=="set-cookie"){
$value[1] = substr($value[1],0,strpos($value[1],";"));
}
$returnstr .= ltrim($value[1]) . "; ";
}
$returnstr = substr($returnstr,0,strlen($returnstr)-2);
return $returnstr;
}else{return "";}
}

public function settimeout($timeout=0){
$this->timeout = $timeout;
}

public function setrequestheader($key,$value=""){
$this->_headers[$key]=$value;
}

public function removerequestheader($key){
if(count($this->_headers)==0){return;}
$_temp=array();
foreach($this->_headers as $keys => $value){
if($keys!=$key){
$_temp[$keys]=$value;
}
}
$this->_headers = $_temp;
}

//拆分url
private function _geturlinfo(){
$url = $this->url;
$count = preg_match("/^http://([^:/]+?)(:(d+))?/(.+?)$/is",$url,$result);
if($count>0){
$this->uri="/" . $result[4];
}else{
$count = preg_match("/^http://([^:/]+?)(:(d+))?(/)?$/is",$url,$result);
if($count>0){
$this->uri="/";
}
}
if($count>0){
$this->protocol="http";
$this->hostname=$result[1];
if(isset($result[2]) && $result[2]!="") {$this->port=intval($result[3]);}else{$this->port=80;}
return true;
}else{$this->excption="url format error";return false;}
}

private function _splitcontent(){
$this->responseheader="";
$this->responsebody="";
$p1 = strpos($this->_buffer,"rnrn");
if($p1>0){
$this->responseheader = substr($this->_buffer,0,$p1);
if($p1+4<strlen($this->_buffer)){
$this->responsebody = substr($this->_buffer,$p1+4);
}
}
}

private function _getheaderinfo(){
$headerstr = $this->responseheader;
$count = preg_match("/^http/(.+?)s(d+)s(.+?)rn/is",$headerstr,$result);
if($count>0){
$this->httpprotocolversion = $result[1];
$this->status = intval($result[2]);
$this->statustext = $result[3];
}
}
}

//以下两函数参考网络
function gzdecode_1 ($data) {
$data = ($data);
if (!function_exists ( 'gzdecode' )) {
$flags = ord ( substr ( $data, 3, 1 ) );
$headerlen = 10;
$extralen = 0;
$filenamelen = 0;
if ($flags & 4) {
$extralen = unpack ( 'v', substr ( $data, 10, 2 ) );
$extralen = $extralen [1];
$headerlen += 2 + $extralen;
}
if ($flags & 8) // filename
$headerlen = strpos ( $data, chr ( 0 ), $headerlen ) + 1;
if ($flags & 16) // comment
$headerlen = strpos ( $data, chr ( 0 ), $headerlen ) + 1;
if ($flags & 2) // crc at end of file
$headerlen += 2;
$unpacked = @gzinflate ( substr ( $data, $headerlen ) );
if ($unpacked === false)
$unpacked = $data;
return $unpacked;
}else{
return gzdecode($data);
}
}
function transfer_encoding_chunked_decode($in) {
$out = "";
while ( $in !="") {
$lf_pos = strpos ( $in, "12" );
if ($lf_pos === false) {
$out .= $in;
break;
}
$chunk_hex = trim ( substr ( $in, 0, $lf_pos ) );
$sc_pos = strpos ( $chunk_hex, ';' );
if ($sc_pos !== false)
$chunk_hex = substr ( $chunk_hex, 0, $sc_pos );
if ($chunk_hex =="") {
$out .= substr ( $in, 0, $lf_pos );
$in = substr ( $in, $lf_pos + 1 );
continue;
}
$chunk_len = hexdec ( $chunk_hex );
if ($chunk_len) {
$out .= substr ( $in, $lf_pos + 1, $chunk_len );
$in = substr ( $in, $lf_pos + 2 + $chunk_len );
} else {//开源代码Cuoxin.com
$in = "";
}
}
return $out;
}
function utf8togb($str){
return iconv("utf-8","gbk",$str);
}
function gbtoutf8($str){
return iconv("gbk","utf-8",$str);
}
?>

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