<form method="post">
<textarea id="replace" class="form-control" name="value"></textarea>
 <hr/>
 <input class="btn btn-outline-secondary" type="submit" name="SubmitFile" value="Сохранить в лог">
 </form>

    
<?php
if (isset($_POST['SubmitFile'])) 
{
$content = $_POST['value'];
$file = "file.txt"; // cannot be an online resource
$Saved_File = fopen($file, 'a+');
fwrite($Saved_File, "$content\n");
fclose($Saved_File);  
}  
?>

foreach ($_REQUEST as $k => $v) {
	$v && $data[$k] = addslashes(strip_tags($v));
}

<?php
$kn[0] = 'Home';
$cont[0] = 'Home component';

$kn[1] = 'Posts';
$cont[1] = 'Posts component';

$kn[2] = 'Archive';
$cont[2] = 'Archive component';

$kn[3] = 'ещё Таб1';
$cont[3] = 'my Таб первый';

$kn[4] = 'Таб n-ый';
$cont[4] = 'Количество Табов неограничено';

$taby = new Taby;

?>

    <style>
      .tab-button {
        padding: 6px 10px;
        border-top-left-radius: 3px;
        border-top-right-radius: 3px;
        border: 1px solid #ccc;
        cursor: pointer;
        background: #f0f0f0;
        margin-bottom: -1px;
        margin-right: -1px;
      }
      .tab-button:hover {
        background: #e0e0e0;
      }
      .tab-button.active {
        background: #e0e0e0;
      }
      .tab {
        border: 1px solid #ccc;
        padding: 10px;
      }
    </style>


<?php $taby->display($kn, $cont)?>


<?php
class taby{
  function display($kn, $kont){
    $kol_kn = count($kn);
    
    for($i=0;$i<$kol_kn;++$i){
      ?>
      <button id="kn<?=$i?>" class="tab-button<?php if($i==0) print ' active';?>"
        onclick="otrTab(<?=$i?>,<?=$kol_kn?>)"><?=$kn[$i]?></button>      
      <?php      
      }
    for($i=0;$i<$kol_kn;++$i){
      ?>
      <div id="tab<?=$i?>" class="tab"<?php if($i!=0) print ' style="display:none"';?>><?=$kont[$i]?></div>
      <?php
      }?>

    
<script>
function otrTab(t, kol_kn){
  if ( typeof (otrTab.activeTab) == 'undefined' ){
    otrTab.activeTab = 0;
  }
  if (t >= 0 && t < kol_kn){
    globalThis['tab'+otrTab.activeTab].style.display = 'none';
    globalThis['kn'+otrTab.activeTab].style.background = '#f0f0f0';
    globalThis['tab'+t].style.display = 'block';
    globalThis['kn'+t].style.background = '#e0e0e0';
    otrTab.activeTab = t;
  }
}
</script>
    
  <?php
    }
  
  }

<?php 
if (!isset($_SESSION)) session_start ();
	//session_start();
	//include "auth.php";
print_r($_SESSION);
?>
...

<?php
	if (!isset($_SESSION)) session_start ();
	var_dump($_SESSION);

	if (isset($_SESSION['id']) && $_SESSION['id'] === true) {
  		echo $_SESSION['id'];
	}

	echo $_SESSION['email'];
	echo $_SESSION['password'];
	echo $_SESSION['firstname'];
	echo $_SESSION['id'];

	print_r($_SESSION);
?>
...

<?php
	if (!isset($_SESSION)) session_start ();
	//phpinfo();
	var_dump($_SESSION);
	/*if (isset($_SESSION['userid']) && $_SESSION['userid'] === true) {
  		echo $_SESSION['userid'];
	}*/
	if(isset($_SESSION['id']) && !empty($_SESSION['id'])){
		echo "yes";
	} else echo "string";

	echo $_SESSION['email'];
	echo $_SESSION['password'];
	echo $_SESSION['firstname'];
	echo $_SESSION['id'];

	print_r($_SESSION);
?>
...

<?php
		$email = $_GET['emailA'];
        /*$password = md5($_GET['passwordA']);*/ //uncomment
        $password = $_GET['passwordA'];
        $status = "default";
        $status = $_GET['radio'];
...

$data = $_POST['wmsExel'];
$emailExel = $data['emailExel'];

$emailExel_arr = array($emailExel);