php實現socket推送技術

這篇文章主要介紹了關於php實現socket推送技術 ，有著一定的參考價值，現在分享給大家，有需要的朋友可以參考一下

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 建立socket設定基本參數

　　　　 socket_bind 綁定ip和連接埠號碼

　　　　 socket_listen 監聽

　　　　 socket_accept 用戶端的串連

　　　　 socket_read 讀取用戶端的資料

　　　　 socket_write 給單獨用戶端發送資料

　　　　 socket_close 關閉串連

用戶端：socket_create 建立socket設定基本參數

　　　　 socket_connect 串連socket

　　　　 socket_write 給服務端發送資料

　　　　 socket_read 讀取服務端資料

　　　　 socket_close 關閉串連

H5websocket不多說了，上連結

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為偵錯模式，輸出log日誌    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, $except, NULL);  //自動選擇來訊息的socket 如果是握手 自動選擇主機            foreach ($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";  //必須以兩個斷行符號結尾        $this->log($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){        //基於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);

用戶端代碼（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>

然後執行php demo.php 開啟socket（從營運那偷學一招，linux下執行nohup php demo.php &可以在後台執行），瀏覽器開啟多個index.html，就能建立通訊了。

代碼解析：

1.屬性$sockets數組儲存每個accept串連（不知道這麼描述對不對）;

2.屬性$handshake數組儲存串連是否在串連狀態;

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