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<?php
session_start();
$captcha_length = $captcha_length?$captcha_length:6;
if($_GET['length']) $captcha_length = $_GET['length'];
$captcha_characters = array();
$captcha_number = array(1,2,3,4,5,6,7,8,9);
$captcha_letter = array('a','b','c','d','e','f','g','h','i','j','k','m','n','p','q','r','s','t','u','v','w','x','y','z');
/**
* DEFAULT NUMBER OF LETTERS AND NUMBERS
*/
$nb_numbers = ceil($captcha_length/2);
$nb_letters = $captcha_length-ceil($captcha_length/2);
/**
* NUMBERS IN THE CAPTCHA
*/
if($_GET['format']=='numbers')
{
$captcha_characters = array();
$nb_numbers = $captcha_length;
}
$captcha_rand_number = array_rand($captcha_number, $nb_numbers);
if(!is_array($captcha_rand_number)) // If you are picking only one entry, array_rand() returns the key for a random entry.
{
$captcha_rand_number = array($captcha_rand_number);
}
//var_dump($captcha_rand_number);
foreach($captcha_rand_number as $value)
{
$captcha_characters[] = $captcha_number[$value];
}
/**
* LETTERS IN THE CAPTCHA
*/
if($_GET['format']=='letters')
{
$captcha_characters = array();
$nb_letters = $captcha_length;
}
if(count($captcha_characters)<$captcha_length)
{
$captcha_rand_letter = array_rand($captcha_letter, $nb_letters);
if(!is_array($captcha_rand_letter)) // If you are picking only one entry, array_rand() returns the key for a random entry.
{
$captcha_rand_letter = array($captcha_rand_letter);
}
//var_dump($captcha_rand_letter);
foreach($captcha_rand_letter as $value)
{
$captcha_characters[] = $captcha_letter[$value];
}
}
//var_dump($captcha_characters);
/**
* SHUFFLE AND IMAGE
*/
shuffle($captcha_characters);
foreach($captcha_characters as $value)
{
$captcha_img_value .= $value;
}
$_SESSION['captcha_img_string'] = $captcha_img_value;
// Create a 100*30 image
$im = imagecreate(110, 28);
// White background and blue text
$bg = imagecolorallocate($im, 238, 238, 238);
$textcolor = imagecolorallocate($im, 0, 0, 255);
// Write the string at the top left
imagestring($im, 5, 10, 6, $captcha_img_value, $textcolor);
// Output the image
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
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