<?php
/*文件名：socket_server.php*/
// 設(shè)置一些基本的變量
$host="127.0.0.1";//Socket運(yùn)行的服務(wù)器的IP地址
$port=1234;//Socket運(yùn)行的服務(wù)器的端口，端口取值為1到65535之間的數(shù)字，前提是這個(gè)端口未被使用
// 設(shè)置超時(shí)時(shí)間，這里設(shè)置為永不超時(shí)，確保PHP在等待客戶端連接時(shí)不會(huì)超時(shí)。
set_time_limit(0);
// 創(chuàng)建一個(gè)Socket，返回一個(gè)Socket句柄
$socket=socket_create(AF_INET,SOCK_STREAM,0) or die("Could not create socket\n");
//綁定Socket到指定的地址和端口
$result=socket_bind($socket,$host,$port) or die("Could not bind to socket\n");
// 開始監(jiān)聽外部連接
$result=socket_listen($socket,3) or die("Could not set up socket listener\n");
/******到這里，服務(wù)器除了等待來自客戶端的連接請(qǐng)求外基本上什么也不做******/
// 另一個(gè)Socket來處理服務(wù)端與客戶端的通信
$spawn=socket_accept($socket) or die("Could not accept incoming connection\n");
// 讀取客戶端的輸入，當(dāng)一個(gè)連接被建立后,服務(wù)器就會(huì)等待客戶端發(fā)送一些輸入信息,這些信息可以由socket_read()函數(shù)來獲得,并把它賦值給PHP的$input變量
$input=socket_read($spawn,1024) or die("Could not read input\n");
//socker_read的第二個(gè)參數(shù)用以指定讀入的字節(jié)數(shù)，你可以通過它來限制從客戶端獲取數(shù)據(jù)的大小
// 下面這不就不解釋了，不知道的自己面壁去
$input=trim($input);
//處理客戶端輸入并返回結(jié)果，當(dāng)客戶端發(fā)來數(shù)據(jù)信息后，信息輸出就要靠socket_write()函數(shù)來完成
$output=strrev($input) ."\n";//反轉(zhuǎn)字符串，這里僅僅是為了更好的區(qū)分兩條信息
socket_write($spawn,$output,strlen($output)) or die("Could not write output\n");
// 關(guān)閉sockets
socket_close($spawn);
socket_close($socket);

<?php
$commonProtocol = getprotobyname("tcp");
$socket = socket_create(AF_INET, SOCK_STREAM, $commonProtocol);
socket_bind($socket, 'localhost', 1337); //socket_bind() 把socket綁定在一個(gè)IP地址和端口上
socket_listen($socket);
$buffer = "NO DATA";
while(true) {
 // Accept any connections coming in on this socket
 $connection = socket_accept($socket);//socket_accept() 接受一個(gè)Socket連接
 printf("Socket connected\r\n");
 // Check to see if there is anything in the buffer
 if($buffer != ""){
 printf("Something is in the buffer...sending data...\r\n");
 socket_write($connection, $buffer . "\r\n"); //socket_write() 寫數(shù)據(jù)到socket緩存
 printf("Wrote to socket\r\n");
 }else {
 printf("No Data in the buffer\r\n");
 }
 // Get the input
 while($data = socket_read($connection, 1024, PHP_NORMAL_READ)){//socket_read() 讀取指定長(zhǎng)度的數(shù)據(jù)
 $buffer = $data;
 socket_write($connection, "Information Received\r\n");
 printf("Buffer: " . $buffer . "\r\n");
 }
 socket_close($connection); //socket_close() 關(guān)閉一個(gè)socket資源
 printf("Closed the socket\r\n\r\n");
}

<?php
// Create the socket and connect
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$connection = socket_connect($socket,'localhost', 1337);
while($buffer = socket_read($socket, 1024, PHP_NORMAL_READ)) {
 if($buffer == "NO DATA") {
 echo("<p>NO DATA</p>");
 break;
 }else{
 // Do something with the data in the buffer
 echo("<p>Buffer Data: " . $buffer . "</p>");
 }
}
echo("<p>Writing to Socket</p>");
// Write some test data to our socket
if(!socket_write($socket, "SOME DATA\r\n")){
 echo("<p>Write failed</p>");
}
// Read any response from the socket phpernote.com
while($buffer = socket_read($socket, 1024, PHP_NORMAL_READ)){
 echo("<p>Data sent was: SOME DATA<br> Response was:" . $buffer . "</p>");
}
echo("<p>Done Reading from Socket</p>");