在socket出現之前已經有ajax定時請求、長輪詢等方案，但都不能滿足需求，socket就應用而生了。
socket基本函數socket
總結下常用的socket函數
服務端： socket_create 創建socket設置基本參數
socket_bind 綁定ip和端口號
socket_listen 監聽
socket_accept 客戶端的連接
socket_read 讀取客戶端的數據
socket_write 給單獨客戶端發送數據
socket_close 關閉連接
客戶端：socket_create 創建socket設置基本參數
socket_connect 連接socket
socket_write 給服務端發送數據
socket_read 讀取服務端數據
socket_close 關閉連接
H5websocket不多說了，上鏈接
OK，開始貼代碼~
----------------------------------------------------------分割線
服務端代碼：
<?phpclass WS { var $master; var $sockets = array(); var $debug = false;//true為調試模式，輸出log日志 var $handshake = array(); function __construct($address, $port){ $this->master=socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() failed"); socket_set_option($this->master, SOL_SOCKET, SO_REUSEADDR, 1) or die("socket_option() failed"); socket_bind($this->master, $address, $port) or die("socket_bind() failed"); socket_listen($this->master,20) or die("socket_listen() failed"); $this->sockets[] = $this->master; $this->say("Server Started : ".date('Y-m-d H:i:s')); $this->say("Listening on : ".$address." port ".$port); $this->say("Master socket : ".$this->master."/n"); while(true){ $socketArr = $this->sockets; $write = NULL; $except = NULL; socket_select($socketArr, $write, $except, NULL); //自動選擇來消息的socket 如果是握手 自動選擇主機 foreach ($socketArr as $socket){ if ($socket == $this->master){ //主機 $client = socket_accept($this->master); if ($client < 0){ $this->log("socket_accept() failed"); continue; } else{ $this->connect($client); } } else { $bytes = @socket_recv($socket,$buffer,2048,0); if ($bytes == 0){ $this->disConnect($socket); } else{ $key = array_search($socket, $this->sockets); if (empty($this->handshake) || !isset($this->handshake[$key]) || !$this->handshake[$key]){ $this->doHandShake($socket, $buffer, $key); } else{ $buffer = $this->decode($buffer); echo $buffer.PHP_EOL; $key = array_search($socket, $this->sockets); $arr = $this->sockets; array_shift($arr); foreach ($arr as $s){ $this->send($s, $buffer); } } } } } } } function send($client, $msg){ $msg = $this->frame($msg); socket_write($client, $msg, strlen($msg)); } function connect($socket){ array_push($this->sockets, $socket); $this->say("/n" . $socket . " CONNECTED!"); $this->say(date("Y-n-d H:i:s")); } function disConnect($socket){ $index = array_search($socket, $this->sockets); socket_close($socket); $this->say($socket . " DISCONNECTED!"); if ($index >= 0){ echo 'unset index is:'.PHP_EOL; unset($this->sockets[$index]); } } function doHandShake($socket, $buffer, $handKey){ $this->log("/nRequesting handshake..."); $this->log($buffer); list($resource, $host, $origin, $key) = $this->getHeaders($buffer); $this->log("Handshaking..."); $upgrade = "HTTP/1.1 101 Switching Protocol/r/n" . "Upgrade: websocket/r/n" . "Connection: Upgrade/r/n" . "Sec-WebSocket-Accept: " . $this->calcKey($key) . "/r/n/r/n"; //必須以兩個回車結尾 $this->log($upgrade); $sent = socket_write($socket, $upgrade, strlen($upgrade)); $this->handshake[$handKey]=true; $this->log("Done handshaking..."); return true; } function getHeaders($req){ $r = $h = $o = $key = null; if (preg_match("/GET (.*) HTTP/" ,$req,$match)) { $r = $match[1]; } if (preg_match("/Host: (.*)/r/n/" ,$req,$match)) { $h = $match[1]; } if (preg_match("/Origin: (.*)/r/n/" ,$req,$match)) { $o = $match[1]; } if (preg_match("/Sec-WebSocket-Key: (.*)/r/n/",$req,$match)) { $key = $match[1]; } return array($r, $h, $o, $key); } function calcKey($key){ //基于websocket version 13 $accept = base64_encode(sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true)); return $accept; } function decode($buffer) { $len = $masks = $data = $decoded = null; $len = ord($buffer[1]) & 127; if ($len === 126) { $masks = substr($buffer, 4, 4); $data = substr($buffer, 8); } else if ($len === 127) { $masks = substr($buffer, 10, 4); $data = substr($buffer, 14); } else { $masks = substr($buffer, 2, 4); $data = substr($buffer, 6); } for ($index = 0; $index < strlen($data); $index++) { $decoded .= $data[$index] ^ $masks[$index % 4]; } return $decoded; } function frame($s){ $a = str_split($s, 125); if (count($a) == 1){ return "/x81" . chr(strlen($a[0])) . $a[0]; } $ns = ""; foreach ($a as $o){ $ns .= "/x81" . chr(strlen($o)) . $o; } return $ns; } function say($msg = ""){ echo $msg . "/n"; } function log($msg = ""){ if ($this->debug){ echo $msg . "/n"; } }} new WS('localhost', 4000);客戶端代碼（H5）：
<html> <head> <title>demo</title> <script src="https://cdn.bootcss.com/jquery/1.9.1/jquery.min.js"></script> </head> <body> <input type="text" id="content"> <input type="button" value="send" id="send"> <script type="text/javascript"> var ws = new WebSocket("ws://localhost:4000"); ws.onopen = function(){ console.log("握手成功"); } ws.onmessage = function(e){ console.log("message:" + e.data); } ws.onerror = function(){ console.log("error"); } $("#send").click(function(){ content = $("#content").val(); console.log(content); ws.send(content); }) </script> </body></html>然后執行php demo.php 開啟socket（從運維那偷學一招，linux下執行nohup php demo.php &可以在后臺執行），瀏覽器打開多個index.html，就能建立通訊了。
代碼解析：
1.屬性$sockets數組保存每個accept連接（不知道這么描述對不對）;
2.屬性$handshake數組保存連接是否在連接狀態;
以上這篇php實現socket推送技術的示例就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持VeVb武林網。
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