fce.php

<?php
function check($wholeFile, $username, $password){
  $strToCompare = $username.":".$password;
  if(stristr($wholeFile, $strToCompare))
    return true;
  else return false;
};

function logged_users($file){
  $strFile = file_get_contents($file);
  $arrFile = explode("\n", $strFile);
  $pole = array(array());

  for($i = 0; $i < count($arrFile); $i++){
    $pole[$i] = explode(":", $arrFile[$i]);
  }

  $usernames = array();
  $passwords = array();
  $k = 0;
  for($i = 0; $i < count($pole)-1; $i++){
    $usernames[$k] = $pole[$i][0];
    $passwords[$k] = $pole[$i][1];
    $k++;
  }

  echo "<form method='POST' action='log.php'><table>\n";
  for($i = 0; $i < count($usernames); $i++){
    echo "<tr><td><input type='checkbox' name='users[]' value='".$usernames[$i]."'/>".($i+1)."</td><td>".$usernames[$i]."</td><td>".$passwords[$i]."</td></tr>\n";
  }
  echo "</table>\n";
  echo "<input type='submit' name='odeslat' value='smazat' />\n</form>\n";
}

function log_user($username, $password){
  file_put_contents("log.txt", $username.":".$password."\n", FILE_APPEND);
}

function delete_users($users = array()){
  $strFile = file_get_contents("log.txt");
  $arrFile = explode("\n", $strFile);

  $patterns = array();

  for($i = 0; $i < count($users); $i++){
    $patterns[$i] = "/^".$users[$i].":[\w\d]+\s/";
  }

  $strFile = preg_replace($patterns, "", $strFile);

  $arrFile = explode("\n", $strFile);
  file_put_contents("log.txt", $strFile);
  logged_users("log.txt");
}
?>