废话少说，直接贴代码了。

error_reporting(E_ALL);

set_time_limit(0);

ob_implicit_flush();

date_default_timezone_set("Asia/Shanghai");

$debug = true;

function response_method_404(){

$result = "";

$result .="HTTP/1.1 404\r\n";

$result .="Content-Length: 14\r\n";

$result .= "Content-Type: text/html\r\n";

$result .="\r\nserver is not \r\n";

return $result;

}

function response_file_404(){

$result = "";

$result .="HTTP/1.1 404\r\n";

$result .="Content-Length:0\r\n";

$result .= "Content-Type: text/html\r\n";

$result .="\r\n\r\n";

return $result;

}

function response_file_type_404(){

$result = "";

$result .="HTTP/1.1 404\r\n";

$result .="Content-Length:11\r\n";

$result .= "Content-Type: text/html\r\n";

$result .="\r\ntype is not\r\n";

return $result;

}

function response_file_img($fileurl){

$body = file_get_contents($fileurl);

$len = strlen($body);

$result="";

$result .="HTTP/1.1 200\r\n";

$result .="Content-Length:$len\r\n";

$result .= "Content-Type: {$size['mime']}\r\n";

$result .="\r\n$body\r\n";

return $result;

}

function response_file_js($fileurl){

global $request;

$body = file_get_contents($fileurl);

$len = strlen($body);

$date = date('D, d M Y G:i:s ').'GMT';

clearstatcache();

$last_modified = date('D, d M Y G:i:s ',filemtime($fileurl)).'GMT';

$result="";

if ( $request['If-Modified-Since'] && $last_modified <= $request['If-Modified-Since'] ){

$result .="HTTP/1.1 304\r\n";

}else{

$result .="HTTP/1.1 200\r\n";

$result .="Cache-Control: public\r\n";

$result .="Date:$date\r\n";

$result .="Last-Modified:$last_modified\r\n";

$result .="Expires:Fri, 24 Jan 2016 10:06:05 GMT\r\n";

$result .="Content-Length:$len\r\n";

$result .= "Content-Type: application/x-javascript\r\n";

$result .="\r\n$body\r\n";

}

return $result;

}

function response_file_html($fileurl){

$body = file_get_contents($fileurl);

$len = strlen($body);

$result = "";

$result .="HTTP/1.1 200\r\n";

$result .="Content-Length:$len\r\n";

$result .= "Content-Type: text/html;charset=utf-8\r\n";

$result .="\r\n$body\r\n";

return $result;

}

function pare_request($str){

global $web_root,$request;

$arr = explode("\r\n",$str);

foreach( $arr as $r){

$pos = stripos($r,":");

if ( $pos ){

$key = trim(substr($r,0,$pos));

$val = trim(substr($r,$pos+1));

$request[$key] = $val;

}

}

writelog(var_export($request,true));

$line0 = explode(" ",$arr[0]);

if ( $line0[0] == "GET" ){

$fileurl = $web_root.$line0[1];

if ( file_exists($fileurl) ){

$pathinfo = pathinfo($fileurl);

if ( $pathinfo['extension'] == "js" ){

$result = response_file_js($fileurl);

}else if ( $pathinfo['extension'] == "png" || $pathinfo['extension'] == "jpg" || $pathinfo['extension'] == "gif" ){

$result = response_file_img($fileurl);

}else if ( $pathinfo['extension'] == "html" ){

$result = response_file_html($fileurl);

}else{

$result = response_file_type_404();

}

}else{

$result = response_file_404();

}

}else{

$result = response_method_404();

}

return $result;

}

function sig_handler($signo)

{

switch ($signo) {

case SIGTERM:

// 处理中断信号

exit;

break;

case SIGHUP:

// 处理重启信号

break;

default:

// 处理所有其他信号

}

}

function writelog($msg){

global $debug;

if ( $debug ){

echo $msg;

}else{

file_put_contents('./log.txt',$msg,FILE_APPEND | LOCK_EX);

}

}

if ( !$debug ){

//产生子进程分支

$pid = pcntl_fork();

if ($pid == -1) {

writelog("could not fork\r\n");

die("could not fork"); //pcntl_fork返回-1标明创建子进程失败

} else if ($pid) {

exit(); //父进程中pcntl_fork返回创建的子进程进程号

} else {

// 子进程pcntl_fork返回的时0

}

// 从当前终端分离

if (posix_setsid() == -1) {

writelog("could not detach form terminal \r\n");

die("could not detach from terminal");

}

// 安装信号处理器

pcntl_signal(SIGTERM, "sig_handler");

pcntl_signal(SIGHUP, "sig_handler");

}

$address = '127.0.0.1';

$port = 1215;

$web_root = "/home/xtgxiso";

$request = array();

if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) {

writelog("socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n");

exit;

}

if (socket_bind($sock, $address, $port) === false) {

writelog("socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n");

exit;

}else{

writelog('Socket ' . $address . ':' . $port . " has been opened\n");

}

if (socket_listen($sock, 5) === false) {

writelog("socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n");

exit;

}else{

writelog("Listening for new clients..\n");

}

$client_id = 0;

do{

if ( ($msgsock = socket_accept($sock)) === false ) {

writelog("socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n");

break;

} else {

$client_id += 1;

writelog("Client #" .$client_id .": Connect\n");

}

$cur_buf = '';

do {

if (false === ($buf = socket_read($msgsock, 2048))) {

writelog("socket_read() failed: reason: " . socket_strerror(socket_last_error($msgsock)) . "\n");

break;

}

writelog("read start:\r\n");

writelog($buf);

writelog("read end:\r\n\r\n");

$talkback = pare_request($buf);

writelog("write start:\r\n");

socket_write($msgsock, $talkback, strlen($talkback));

//writelog($talkback);

writelog("write end:\r\n\r\n\r\n");

break;

} while (true);

socket_close($msgsock);

}while(true);

writelog("socket_close \r\n");

socket_close($sock);

实现了解析html,js,png,jpg,gif这几种格式的支持

这只是简单说明了一下思路，非常有利于大家了解http协议和优化其他http服务

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