generátor hesiel

<?php
$numbers = array();

function randLetter()
{
    $v = chr(97 + mt_rand(0, 25));
    return $v;
}


for($j = 0; $j < 10; $j++) {
    for ($i = 0; $i < 8; $i++) {
        $n = rand(0, 2);
        switch ($n) {
            case 0:
                $cislo = rand(0, 9);
                $numbers[$i] = $cislo;
                break;
            case 1:
                $letter = randLetter();
                $numbers[$i] = $letter;
                break;
            case 2:
                $captletter = randLetter();
                $captletter = strtoupper($captletter);
                $numbers[$i] = $captletter;
                break;
        }
    }
    echo ("{$j}");
    echo (".");
    foreach ($numbers as $hodnota){
        echo "{$hodnota}";
    }
    echo("\n");
    }

function str_random($length = 8)
{
   $arr = ['a', 'b', 'c', 'd', 'e', '0', '1', '2', '3', '4', 'A', 'B', 'C', 'D', 'E']; //pridaj ostatné písmená, čísla a prípadne ďalšie povolené znaky
   
   $str = '';
   for($i = 0; i < $length; $i++) {
      $str .= $arr[ array_rand($arr) ];
   }

   return $str;
}

<?php
  // Copyraid je cez uja google.
  // Adapted for The Art of Web: www.the-art-of-web.com
  // Please acknowledge use of this code by including this header.
 // http://www.the-art-of-web.com/php/captcha/
  // initialise image with dimensions of 110 x 27 pixels
  $image = imagecreatetruecolor(110, 27) or die("Cannot Initialize new GD image stream");

  // set background to white and allocate drawing colours
  $background = imagecolorallocate($image, 0x22, 0x22, 0xFF);

  imagefill($image, 0, 0, $background);
  $linecolor = imagecolorallocate($image, 0x6B, 0xA1, 0x6B);
  $line_line = imagecolorallocate($image, 0x33, 0x33, 0x33);
  $textcolor = imagecolorallocate($image, 0xFF, 0xC8, 0x22);

// Set the line thickness to 3
imagesetthickness($image, 3);
  imagerectangle($image, 0, 0, 110, 27, $line_line);

  // draw random lines on canvas
  for($i=0; $i < 6; $i++) {
    imagesetthickness($image, rand(1,1));
    imageline($image, 0, rand(0,30), 120, rand(0,30), $linecolor);
  }

  session_start();

$font = './arial.ttf';

$font_size = '20';
  // add random digits to canvas
$text = '';
$letter = array_merge(range('0', '9'), range('A', 'Z'), range('a', 'z'));

    for($i=0; $i < 5; $i++) {
        $text .= $letter[mt_rand(0, count($letter) - 1)];
    }

imagettftext($image, $font_size, 0, 10, 21, $textcolor, $font, $text);

  // record digits in session variable
  // http://php.net/manual/en/function.imagettftext.php
$_SESSION['cislo_Fzmo7'] = $text;

  // display image and clean up
  header('Content-type: image/png');
  imagepng($image);
  imagedestroy($image);

?>