本示例使用的读卡器：RFID网络WIFI无线TCP/UDP/HTTP可编程二次开发读卡器POE供电语音-淘宝网 (taobao.com)

<?php
mb_http_output('utf-8');
$port=88;
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
$bool = socket_bind($socket, "0.0.0.0", $port);
if($bool)
    echo "Server is listening on port:".$port."\n";
else{
    echo "Socket bind port:".$port." Error!";
    exit;
}

while($bool){
    try {
        $bool = socket_listen($socket);
        if (!$bool) {
            echo "LISTEN ERROR:" . socket_strerror(socket_last_error()) . '\n';
            socket_close($socket);
        }
        $new_socket = socket_accept($socket);
        if (!$new_socket) {
            $bool=false;
            socket_close($socket);
            echo "ACCPET ERROR:" . socket_strerror(socket_last_error()) . '\n';
        }
        $string = socket_read($new_socket, 1024);
        $data = request($string);
        if(substr($data,0,10)=="Response=1") {
            $num = socket_write($new_socket, $data);
            if ($num == 0)
                echo "WRITE ERROR:" . socket_strerror(socket_last_error()) . "\n";
        }
        echo $data . "\n\n";
        socket_close($new_socket);
    }
    catch(Exception $e1) {
        echo "Server Err:".$e1."\n";
    }
}

/* [读取get或post请求中的包序号、机号、卡号、卡类型、设备序号、读卡状态等，返回相应的字符串驱动读卡器显示文字及播报语音] */
function request($string)
{
    $info="";
    $card="";
    $request="";
    $ResponseStr="";

    try {
        echo $string . "\n";
        $requestmode = substr($string, 0, 4);
        if ($requestmode == "GET ") {
            $begin = stripos($string, "?") + 1;
            $end = stripos($string, "HTTP/1.1");
            $request = substr($string, $begin, $end - $begin);
        } elseif ($requestmode == "POST") {
            $pattern = "/\s+/";
            $FieldsList = preg_split($pattern, $string);
            $conuts = count($FieldsList);
            $isjson = stripos($string, "application/json");
            $request = $FieldsList[$conuts - 1];
            if ($isjson > 0) {          //可以直接使用JSON来解板，此处统一替换成字符串处理
                $request = str_replace("{", "", $request);
                $request = str_replace("}", "", $request);
                $request = str_replace("\"", "", $request);
                $request = str_replace(":", "=", $request);
                $request = str_replace(",", "&", $request);
            }
        }
        $Fields = explode("&", $request);
        $conuts = count($Fields);
        for ($p = 0; $p < $conuts; $p++) {
            $para = explode("=", $Fields[$p]);
            switch ($para[0]) {
                case "info":
                    $info = $para[1];
                    break;
                case "jihao":
                    $jihao = $para[1];
                    break;
                case "cardtype":
                    $cardtype = $para[1];
                    $typenum = hexdec($cardtype) % 16;                  //typenum=1 ID卡，2 HID卡，3 T5557卡，4 EM4305卡，5 IC卡，6 二代身份证，7 是15693卡，IClass"
                    $pushortake = intval(hexdec($cardtype) / 128);  //pushortake=0 表示读卡，>0表示卡离开感应区
                    break;
                case "card":
                    $card = $para[1];
                    break;
                case "data":
                    $data = $para[1];
                    break;
                case "dn":
                    $dn = $para[1];
                    break;
                case "status":
                    $status = $para[1];
                    break;
            }
        }
        if(strlen($info)>0 and strlen($info)>0) {
            if ($pushortake == 0)   //播报的中文语音，[v8]表示语音大小，取值v1 到 v16, TTS中文语音要转换编码
                $ChineseVoice = "[v8]" . GetChineseCode("读取卡号[n1]") . $card;
            else
                $ChineseVoice = "[v8]" . GetChineseCode("卡号[n1]") . $card . GetChineseCode("离开感应区");

            //此处可加入业务对数据库的查询、删除、增加、修改等操作，结果以文字、语音信息回应

            $DisplayStr = "{" . GetChineseCode("卡号") . ":}";  //显示的文字，{}内文字可以高亮显示，中文必须转换编码,英文字符、数字等不需要转换
            $DisplayStr = $DisplayStr . substr($card . "        ", 0, 12);
            $DisplayStr = $DisplayStr . substr(date('Y-m-d H:i:s', time()), 2, 17);

            //Response=1是固定的回应头信息+接收的包序号+显示文字+显示延时秒数+蜂鸣响声代码+TTS语音
            $ResponseStr = "Response=1," . $info . "," . $DisplayStr . ",20,1," . $ChineseVoice;
        }
        return $ResponseStr;
    }
    catch (Exception $e1) {
        echo "Request ERR:".$e1."\n";
    }
}

//获取中文汉字GB2312编码，显示中文、TTS中文语音必须转换编码
function GetChineseCode($inputstr){
    if(mb_detect_encoding($inputstr, 'UTF-8', true) === true)
        $gbkstr=iconv("UTF-8","GB2312",$inputstr);      //中文必段强制使用GB2312编码格式
    else
        $gbkstr=$inputstr;
    $strlens=strlen($gbkstr);
    $hexcode="";
    for($i=0;$i<$strlens;$i++){
        if($i % 2 ==0) {
            $hexcode = $hexcode . "\\x";
        }
        $byte = ord($gbkstr[$i]);
        $b=substr('00'.dechex($byte ),-2);
        $hexcode=$hexcode.$b;
    }
    return $hexcode;
}