Socket programming with PHP and insert data to the database (continuous) - php

Question

I have multiple gps devices. I cannot make changes to this device. It sends data to a port.
I break this incoming data and insert it to the database according to its type. But sometimes I have problems. Device sometimes sends id_number field blank. It sends all other data correctly. And sometimes the program just crashes.
<?php
set_time_limit (0);
$ip_address = "xxx.xxx.xxx.xxx";
$port = "yyy";
$server = stream_socket_server("tcp://$ip_address:$port", $errno, $errorMessage);
if ($server === false) {
die("stream_socket_server error: $errorMessage");
}
$client_sockets = array();
while (true) {
// prepare readable sockets
$read_sockets = $client_sockets;
$read_sockets[] = $server;
// start reading and use a large timeout
if(!stream_select($read_sockets, $write, $except, 300000)) {
die('stream_select error.');
}
// new client
if(in_array($server, $read_sockets)) {
$new_client = stream_socket_accept($server);
if ($new_client) {
//print remote client information, ip and port number
//echo 'new connection: ' . stream_socket_get_name($new_client, true) . "\n";
$client_sockets[] = $new_client;
//echo "total clients: ". count($client_sockets) . "\n";
// $output = "hello new client.\n";
// fwrite($new_client, $output);
}
//delete the server socket from the read sockets
unset($read_sockets[ array_search($server, $read_sockets) ]);
}
// message from existing client
foreach ($read_sockets as $socket) {
$data = fread($socket, 2048);
echo "data: " . $data . "\n";
if($data[0]=='$') {
write_file($data);
$explp = array();
$explp = explode("#",$data);
$i=0;
$j=count($explp);
while ($i < ($j-1)){
$listexa= explode(";",$explp[$i]);
$location= explode(",",$listexa[0]);
$response = "";
$id_number = $location[2];
$package_type = substr($location[0],1);
if ($package_type == 'DATA')
{
$lati = substr($listexa[2],1);
$longi = substr($listexa[3],2);
$speed = $listexa[4];
if(count($speed)>2)
data_package($id_number,$package_no,'DATA');
}
else if($package_type=='GEOLOC')
{
$lati = substr($listexa[3],1);
$longi = substr($listexa[4],2);
$speed = $listexa[5];
if($location[3]=='-' || $location[3]=='2' || $location[3]=='R')
{
$speed= '0';
$package_type = 'GEO';
geo_package($id_number,$package_no,$package_type);
}
}
else if($package_type=='ALIVE')
{
alive_package($package_no,$id_number);
}
$i = $i+1;
}
if (!$data) {
unset($client_sockets[ array_search($socket, $client_sockets) ]);
#fclose($socket);
//echo "client disconnected. total clients: ". count($client_sockets) . "\n";
continue;
}
//send the message back to client
if (sizeof($response) > 0) {
fwrite($socket, $response);
}
}
} }
function alive_package($package_no,$id_number){
$link=dbcon();
try{
$statement = $link->prepare('INSERT INTO alive_packages (package_no, id_number)
VALUES (:package_no, :id_number)');
$statement->execute([
'package_no' => $package_no,
'id_number' => $id_number,
]);
}
catch (PDOException $e) {
echo "DataBase Error: The user could not be added.<br>".$e->getMessage(); write_file_log($e->getMessage());
$link = null;
} catch (Exception $e) {
echo "General Error: The user could not be added.<br>".$e->getMessage(); write_file_log($e->getMessage());
$link = null;
}
$link = null;
}
function data_package($id_number,$package_no,$package_type){
$link=dbcon();
$typee= '-';
try{
$statement = $link->prepare('INSERT INTO data_package (id_number, package_no, package_type)
VALUES (:id_number, :package_no, :package_type)');
$statement->execute([
'id_number' => $id_number,
'package_no' => $package_no,
'package_type' => $package_type,
]);
}
catch (PDOException $e) {
echo "DataBase Error: The user could not be added.<br> ".$e->getMessage(); write_file_log($e->getMessage());
$link = null;
} catch (Exception $e) {
echo "General Error: The user could not be added.<br> ".$e->getMessage(); write_file_log($e->getMessage());
$link = null;
}
$link = null;
}
function geo_package($id_number,$package_no,$package_type){
$link=dbcon();
$typee= '-';
try{
$statement = $link->prepare('INSERT INTO geo_package (id_number,package_no,package_type)
VALUES (:id_number, :package_no, :package_type)');
$statement->execute([
'id_number' => $id_number,
'package_no' => $package_no,
'package_type' => $package_type,
]);
}
catch (PDOException $e) {
echo "DataBase Error: The user could not be added.<br> ".$e->getMessage(); write_file_log($e->getMessage());
$link = null;
} catch (Exception $e) {
echo "General Error: The user could not be added.<br> ".$e->getMessage(); write_file_log($e->getMessage());
$link = null;
}
$link = null;
}
function dbcon(){
$dbhost = '127.0.0.1';
$dbname = 'examplename';
$dbusername = 'exampleuser';
$dbpassword = 'examplepassword';
$link = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbusername, $dbpassword);
$link->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
return $link;
}
function write_file($data){
$filename = "xxx.txt";
$file = fopen( $filename, "a+" );
fwrite( $file, $data."\n" );
fclose( $file );
}
function write_file_log($data){
$filename = "yyy.txt";
$file = fopen( $filename, "a+" );
fwrite( $file, $data."\n" );
fclose( $file );
}
I want it to run 24/7 and only restart that socket when something goes wrong. Or I want to take the id_number field of a device once and use it over and over again. Since there are more than one device, a separate socket is opened for each one. But when the id_number of a device is empty, I cannot insert the data to the database. How can I solve this problem?
Briefly, while a socket sends data normally, after a while it starts to send blank id_number and I lose the data until I restart the program. Other devices continue to work.
I have 2 options.
1st option: restart socket when id_number is empty.
2nd option: restart socket when id_number is empty.
But I don't know how to do these.
An additional problem or shortcut is to run the code again when an error occurs in the program. How can I do that?
Note: I am running a php program with a service in Centos 7.