我使用PHP进行地理定位项目，使用套接字我有问题，我解释一下： 客户端（盒式GPS）发送其标识符（IMEI），并等待服务器的应答（消息“ 01”），在接收到（消息“ 01”）后，客户端将数据发送到服务器，服务器将其存储在数据库。在这里，它仅适用于一个客户端，甚至连接了多个客户端，但如果服务器在等待数据GPS客户端（A）时，另一个客户端（B）已连接，则问题出在服务器接收到数据GPS的数据时客户端（A）时，他将使用客户端（B）的名称存储它们，因为在我的代码中，服务器使用最后连接的客户端的名称存储GPS数据。
<?php
error_reporting(E_ALL);
set_time_limit(0);
$ip='192.168.1.1';
$port=135;
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) ;
socket_bind($sock, $ip , $port) ;
socket_listen ($sock);
echo "Waiting for incoming connections... \n";
$tab=array();
$client = array($sock);
while (true)
{
$read = $client;
$write=null ;
$except=null ;
if(socket_select($read , $write , $except , 0)<1)
continue;
if (in_array($sock, $read))
{
$client[] = $newsock = socket_accept($sock);
socket_getpeername($newsock, $address, $port) ;
echo "Client $address : $port is now connected to us. \n";
echo "Waiting for incoming data... \n";
$key = array_search($sock, $read);
unset($read[$key]);
}
foreach ($read as $read_sock)
{
$input = socket_read($read_sock, 102401,PHP_BINARY_READ) ;
if ($input == false)
{
$key = array_search($read_sock, $client);
unset($client[$key]);
echo "client disconnected.\n";
continue;
}
if(!empty($input))
{
if(strlen($input)==17){
//$input=bin2hex($input) ;
$input = substr($input,2,strlen($input));
$imei_verif=$input ;
echo "Le 1er socket reçu : \n";
echo "IMEI =$input"."\n"."length=".strlen($input);
//$response=hex2bin('01');
$response='01';
echo "\n La réponse est 01 \n";
$len = strlen($response);
$res_write=socket_send($read_sock ,$response,$len,0);
echo "GPS informations ....... \n";
$conn = new mysqli("localhost", "root", "", "fma120");
$result = $conn->query("SELECT * FROM vehicule WHERE imei='$imei_verif'");
$outp = $result->fetch_assoc();
$identifiant= $outp['identifiant'] ;
$matricule=$outp['matricule'];
echo $identifiant."\n";
echo $matricule;
}
else {
echo "Client $address : $port is now connected to us. \n";
$input=bin2hex($input) ;
$payload=$input ;
$crc = substr($payload, strlen($payload) - 8, 8);
echo "crc = ".$crc ."\n" ;
$avlDataWithChecks = substr($payload, 16, -8);
if (substr($avlDataWithChecks, 2, 2) !== substr($avlDataWithChecks, strlen($avlDataWithChecks) - 2, 2))
{
echo "First element count check is different than last element count check \n ";
echo " informations = " .$input ."\n" ;
}
if(substr($avlDataWithChecks, 2, 2) == substr($avlDataWithChecks, strlen($avlDataWithChecks) - 2, 2) )
{
echo"voila ....................... GPS informations réçu : \n" ;
echo"input = ".$input ."\n" ;
echo "length=".strlen($input);
echo "avlDataWithChecks = ".$avlDataWithChecks ."\n" ;
$numberOfElements = hexdec(substr($avlDataWithChecks, 2, 2));
echo "numberOfElements = " .$numberOfElements ."\n" ;
$avlData = substr($avlDataWithChecks, 4, -2);
$position = 0;
$resultData = [];
$dateTime = new DateTime();
$timestamp = hexdec(substr($avlData, $position, 16)) / 1000;
$timestamp+= 7200;
echo "timestamp =".$timestamp . "\n";
$dateTime -> setTimestamp(intval($timestamp));
echo "dateteTime = " .$dateTime->format('U = Y-m-d H:i:s') . "\n";
$position += 16;
$priority = (int)hexdec(substr($avlData, $position, 2));
echo" priority = " .$priority ."\n" ;
$position += 2;
$longitude = substr($avlData, $position, 8);
$longitude = (float)(hexdec($longitude) / 10000000);
echo" longitude = " .$longitude ."\n" ;
$position += 8;
$latitude = substr($avlData, $position, 8);
$latitude = (float)(hexdec($latitude) / 10000000);
echo" latitude = " .$latitude ."\n" ;
$position += 8;
$altitude = (int)hexdec(substr($avlData, $position, 4));
echo" altitude = " .$altitude ."\n" ;
$position += 4;
$angle = (int)hexdec(substr($avlData, $position, 4));
echo" angle = " .$angle ."\n" ;
$position += 4;
$satellites = (int)hexdec(substr($avlData, $position, 2));
echo" satellites = " .$satellites ."\n" ;
$position += 2;
$speed = (int)hexdec(substr($avlData, $position, 4));
echo" speed = " .$speed ."\n" ;
echo "\n La réponse est $numberOfElements \n";
$output = sprintf("%08X", $numberOfElements) ;
$output2=$output ;
echo "avant l'envoie = " .$output2 ."\n" ;
$output2 =hex2bin($output2);
$len = strlen($output2);
$res_write=socket_send($read_sock,$output2,$len,0);
echo "apres l'envoie = " .$output2 ."\n" ;
//echo $identifiant."\n";
//$output2 =hex2bin($output2);
$len = strlen($output2);
$res_write=socket_send($read_sock ,$output2,$len,0);
echo "apres l'envoie = " .$output2 ."\n" ;
try
{
$bdd = new PDO('mysql:host=localhost;dbname=fma120;charset=utf8', 'root', '');
}
catch(Exception $e)
{
die('Erreur : '.$e->getMessage());
}
$bdd->exec("INSERT INTO gps_data(client,matricule,imei, timestamp, longitude, latitude, altitude,angle,satellites,speed,etat,n_of_elem) VALUES('$identifiant','$matricule','$imei_verif', '$timestamp', '$longitude', '$latitude', '$altitude','$angle','$satellites','$speed','0','$numberOfElements')");
echo 'Strored in the data base';
}
}
}
}
}
?>
答案 0 :(得分：0)
那么您需要存储数据之间的关系，例如，您可以创建一个具有唯一客户端ID作为键的多数组。您还需要存储客户端ID <=>客户端套接字关系。
实现起来并不是那么困难，但是要使所有相关的东西保持井井有条，因此要使其尽可能地容易（我建议创建一个类来保存与连接相关的所有信息，因此您不必遍历抽象套接字资源，而可以进行遍历逻辑连接对象，这使得处理起来更加容易）
例如
class ConnectionInfo
{
public $Socket;
public $ID;
}
或
$Connections = [];
$Connections[$ID]['Socket'] = $Socket;
答案 1 :(得分：0)
问题是gps数据不包含有关客户端的任何信息，所以我无法知道此数据与哪个客户端有关，也许如果我知道消息源的ip地址，然后将其与ip地址进行比较第一次连接的时间（当客户端发送imei时）。
我可以存储第一个连接的ID，但是如何知道同一客户端的第二个连接的信息，以将它们与存储的ID进行比较？