.htaccess - Limited users and passwords in . htpasswd and hide form in the php website -

i have secret login page (useradmin.php) users can add , delete users have access secret website (listmembers.php). want limit users adding more users 8 in useradmin site. if there 8 users want hide add form on page , show users message in order add user need first delete current users.

can in php file not connected database or have in .htaccess or .htpasswd file?

here php useradmin.php

<?php  // list users  $filename = ".htpasswd";  if (!empty($_get["usr"])) {    $usr = $_get["usr"]; } else {   $usr = ""; }  if (!empty($_get["pw"])) $pw = $_get["pw"];  if (!empty($_get["radera"])) {   $radera = $_get["radera"]; } else {   $radera = 0; }  echo "<h2>administration av användare och lösenord</h2>";  if (strlen($usr)>2) {   //append new user end of file   $handle = fopen($filename, "a");   $userdata = $usr.":";   $userdata = $userdata.crypt($pw)."\n";   fputs($handle,$userdata);   fclose($handle); }  if ($radera>0) {   // delete user    $rad = 1;    //read old file   $handle = fopen($filename, "r");   $buffer[$rad] = fgets($handle, 4096);    while (!feof($handle)) {     $rad++;     $buffer[$rad] = fgets($handle, 4096);      }    $maxrad = $rad;   fclose($handle);    //write data buffer exept deleted user    $handle = fopen($filename, "w");   $rad = 1;      while ($rad < $maxrad) {     if ($rad != $radera) {       fputs($handle,$buffer[$rad]);     }     $rad++;   }    fclose($handle); }  //list users $handle = fopen($filename, "r"); $rad = 1;   echo "<table border=1 >";  $buffer[$rad] = fgets($handle, 4096);  while (!feof($handle)) {   echo "<tr><td>";      $user[$rad] = substr($buffer[$rad], 0, strpos($buffer[$rad],":"));   echo $user[$rad];      echo "</td><td>";   echo "<a href=\"useradmin.php?radera=$rad\">radera</a>";       echo "</td></tr>";   $rad++;        $buffer[$rad] = fgets($handle, 4096); }  echo "</table>"; fclose($handle);  // limit users 8  ?>  <h2>lägg till ny användare</h2>  <h3 style="color:red">obs! antalet användare är begränsat till max 8!<br>du måste ta bort en användare för att kunna lägga till en ny.</h3>  <form action="useradmin.php" method="get" >  login:    <input type=text name="usr"><br>  lösenord: <input type="text" name="pw"><br>         <input type=submit value="uppdatera">  </form>