PHP - Mysql Update And Fetch Not Working As Planned

Hello.
I have a form for users to make reservations and they have to pay for that.

I activate the Payment Gateway Platform (by Redsys in Spain), and it works fine asking you for card number and it goes through correctly and says PAYMENT OK, but the notification.PHP FILE does not work.

Could my server (SSL) configuration be the problem? or is it the CODE?

Any help about this, please, would be highly appreciated.

Thank you.

Part of the Nofication.php code is:

__________________________________________________________________________________

<?php
  @ini_set("display_errors","1");
  @ini_set("display_startup_errors","1");

  $handle = fopen("_redsys.log", "a");

  require_once("include/dbcommon.php");
  require_once("redsysHMAC256_API_PHP_4.0.2/apiRedsys.php"); 

  $miObj = new RedsysAPI; 

  $version = postvalue("Ds_SignatureVersion"); 
  $params = postvalue("Ds_MerchantParameters"); 
  $signatureRecibida = postvalue("Ds_Signature");

//  $version = "HMAC_SHA256_V1"; 
//  $params = "eyJEc19BbW91bnQiOiIyMDAiLCJEc19DdXJyZW5jeSI6Ijk3OCIsIkRzX09yZGVyIjoiMjAwNjE4MDkyNDMzIiwiRHNfTWVyY2hhbnRDb2RlIjoiOTk5MDA4ODgxIiwiRHNfVGVybWluYWwiOiIxIiwiRHNfUmVzcG9uc2UiOiI5OTk4IiwiRHNfQXV0aG9yaXNhdGlvbkNvZGUiOiIiLCJEc19UcmFuc2FjdGlvblR5cGUiOiIwIiwiRHNfU2VjdXJlUGF5bWVudCI6IjAiLCJEc19MYW5ndWFnZSI6IjEiLCJEc19NZXJjaGFudERhdGEiOiIifQ=="; 
//  $signatureRecibida = "Aa6GG9IfCYlRrj-yF5VxXg_qmhJ3R-fmfXxGvB8w2Sk="; 
  
  $txt = "version=".$version."\nparams=".$params."\nsignatureRecibida=".$signatureRecibida."\n";
  fwrite($handle,"\n\n\n".date("Y-m-d h:i:s")."\n");
  fwrite($handle,$txt);

  $decodec = $miObj->decodeMerchantParameters($params); 
  $codigoRespuesta = $miObj->getParameter("Ds_Response"); 

  $claveModuloAdmin = 'sq7HjrUOBfKmC576ILgskD5srU870gJ7'; 
  $signatureCalculada = $miObj->createMerchantSignatureNotif($claveModuloAdmin, $params); 
  $res = my_json_decode($decodec);
  fwrite($handle,$decodec."\n");
  

  if ($signatureCalculada === $signatureRecibida && $res["Ds_AuthorisationCode"]!="++++++" && !isset($res["Ds_ErrorCode"]) { 
  
    fwrite($handle,"Ds_Order = ".$res["Ds_Order"]."\n");
    DB::Query("update reservas set status=1 where Ds_Order='".$res["Ds_Order"]."'");
    $rs2 = DB::Query("select * from reservas where Ds_Order='".$res["Ds_Order"]."'");
    $values = $rs2->fetchAssoc();
    $email=$values['Email'];
    $msg="";
    $msg.= "El seu codi de reserva és: ". dechex(999999999-$values['Id_Reserva'])."<br>";
    $msg.= "Código sin cifrar: ". 999999999-$values['Id_Reserva']."<br>";
    $msg.= "Reserva descifrada ". (((hexdec(dechex(999999999-$values['Id_Reserva'])))-999999999)*-1)."<br>";
    $msg.= "La data de la seva reserva es : ".$values['Dia']."-".$values['Mes']."-".$values['Año']."<br>";

    $sql = "SELECT Espacio FROM Espacios WHERE Id_Espacio=" . $values["Id_Espacio"];
    $rs = CustomQuery($sql);
    $data = db_fetch_array($rs);
    //$result["txt"] = "Ãrea: " . $data["c"];
    //$msg.= "QR : " .$values['QR']."\r\n";         //json_decode($image, true);
    //<img src="http://www.htmldog.com/badge1.gif">          https://chart.googleapis.com/chart?cht=qr&chs=150x150&chl=12345678
    //$image2= '<img src="data:image/jpeg;base64,'.$values['QR'].'>';
    $msg.= '<img src="https://chart.googleapis.com/chart?cht=qr&chs=150x150&chl=http%3A%2F%2Fwww.sungest.net/reservas_list.php?qs='.dechex(999999999-$values['Id_Reserva']).'&f=all%2F&choe=UTF-8">';
    //echo '<img src="https://chart.googleapis.com/chart?cht=qr&chs=150x150&chl=http%3A%2F%2Fwww.sungest.net/reservas_list.php?qs='.dechex(999999999-$values['Id_Reserva']).'&f=all%2F&choe=UTF-8">';

    //    echo '<img src="data:image/jpeg;base64,'.$imageData.'">';
    //echo '<img src="data:image/jpeg;base64,'.$imageData.'">';
    //echo '<img src="data:image/jpeg;base64,'.$imageData.'">';
    $msg.= "<font size=4 color='Navy'><b>La seva reserva és per anar a : </b></font>". "<font size=5 color='Olive'><b>" .$data["Espacio"] . "</b></font><br>";
    $msg.= "<font size=4 color='Olive'><b>La seva àrea assignada és: </b></font>".$values['Id_Area']."<br>";

    $subject="La seva reserva per la platja";
    $ret=runner_mail(array('to' => $email, 'subject' => $subject, 'htmlbody' => $msg));
        echo "ok";
  } 
  else
      DB::Exec("delete from reservas where Ds_Order='".$res["Ds_Order"]."'");
fclose($handle);
?>

_______________________________________________________________________________________________

<?php



require("connection.php");




$query = 'SELECT * FROM job_post WHERE id_jobpost= :Id';
$start = $bdd->prepare($query);
$start->execute(array(':Id' => $_GET['id_jobpost'])); 
$result = $start->fetch();

foreach ($result as $results) {
    $jobtitle = $result['jobtitle'];
    $id_jobpost = $result['id_jobpost'];
    $description = $result['description'];
    
}


?> 

https://prnt.sc/uk3913

Whats wrong with this code

I am trying to create a simple calendar where a user can add/remove their availability date. This part works so far. Now what I am having trouble with is highlighting the already selected dates that are fetched from a MySQL database.

Here's my code.

// HTML
<div id="datetimepicker1"></div>

// Jquery/Ajax

<script>
$(document).ready(function () {

  $('#datetimepicker1').datepicker({
    dateFormat: "yy-mm-dd",
    multidate: true,
    onSelect: function () {
        var getDate = $("#datetimepicker1").val();

        $.ajax({
             type: "POST", //or GET. Whichever floats your boat.
             url: "snippets/adapter-set.php",
             data: { date: getDate },
             success: function(data) {
              // alert(data);
             },
             error: function() {
                 alert("Error.");
             }
        });
    }
  });
});
</script>

// PHP
// adapter-set.php

$post_date = $_POST['date'];

$find_query = $db->prepare("SELECT user_id FROM user_dates WHERE date_available = :date_available");
$find_query->bindParam(':date_available', $post_date);
$find_query->execute();
$result_find = $find_query->fetchAll(PDO::FETCH_ASSOC);
if(count($result_find) > 0) {
  foreach($result_find as $row) {
    $user_id =	$row['user_id'];
  }
  $delete_query = $db->prepare("DELETE FROM user_dates WHERE user_id = :user_id");
  $delete_query->bindParam(':user_id', $user_id);
  $delete_query->execute();
  $result_delete = $delete_query->execute();
  if($result_delete == false) {
   echo 'delete false';
  } else {
   echo 'delete success';
  }
} else {
  $insert_query = $db->prepare("INSERT INTO user_dates(date_available) VALUES(:date_available)");
  $insert_query->bindParam(':date_available', $post_date);
  $result_insert = $insert_query->execute();
  if($result_insert == false) {
   echo 'insert false';
  } else {
   echo 'insert success';
  }

}

The above code works fine. It inserts and deletes a date row in MySQL database table based on a click.

Now what I would like to do is to highlight all the "available" dates that are already inserted into the database; so that the user knows which dates he has already selected. This is my code for that. But it doesn't seem to be working. No errors. It's just not highlighting the inserted dates. Can you tell me what I'm doing wrong?

// JQUERY
<script>
    $(document).ready(function() {

        $.post('snippets/adapter-fetch.php', {}, function(data){
            $("#datetimepicker1").datepicker({
              datesEnabled : data.datesEnabled
            });
        }, 'json');

    });
</script>

// PHP
// adapter-fetch.php

$global_user_id = 5;

$find_query = $db->prepare("SELECT date_available FROM user_dates WHERE user_id = :user_id");
$find_query->bindParam(':user_id', $global_user_id);
$find_query->execute();
$result_find = $find_query->fetchAll(PDO::FETCH_ASSOC);
if(count($result_find) > 0) {
  foreach($result_find as $row) {
    $date_available =	$row['date_available'];

    echo $date_available;
  }
} else {
  echo 'not dates available';
}

<?php
// Make a MySQL Connection
$query = "SELECT * FROM staff";
    
$result = mysql_query($query) or die(mysql_error());


while($row = mysql_fetch_array($result)){

    if($row['clock'] < time()) {
    echo "<b>"$row['name']. " - ". $row['age']"</b>";
    echo "<br />";

    } else {

    echo $row['name']. " - ". $row['age'];
    echo "<br />";

    }
}
?>

//my controller
<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use DB;

class homeController extends Controller
{
    public function index() {
        
        $employee = DB::table('employee')->orderBy('id','desc')->get();
        
        $department = DB::table('department')->orderBy('id','desc')->get();

    	return view('index', ['employee' => $employee , 'department' => $department]);
    }
}

//my routes

Route::get('index','homeController@index');

//my view using blade temmplating engine
@foreach($employee as $emp)
<div class="employee">
  <b>{{ $emp->name }} </b>
  <a href="employee/{{ $emp->id }}">
	<p class="intro">{{ substr($emp->intro ,0, 50) }}...</p>   
  </a>
</div>
@endforeach

@foreach($department as $dep)
<div class="department">
  <b>{{ $dep->name }} </b>
  <a href="department/{{ $dep->id }}">
	<p class="desc">{{ substr($dep->description ,0, 100) }}...</p>   
  </a>
</div>
@endforeach

I want to fetch using ajax, how can i do it, teach/help me