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This is the code I use (minus Google Analytics) for the CodeIgniter encryption key generator located at
* Generate an encryption key for CodeIgniter.
function generate_token ($len = 32)
// Array of potential characters, shuffled.
$chars = array(
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
$num_chars = count($chars) - 1;
$token = '';
// Create random token at the specified length.
for ($i = 0; $i < $len; $i++)
$token .= $chars[mt_rand(0, $num_chars)];
return $token;
?><!DOCTYPE html>
<html lang="en-us" dir="ltr">
<meta charset="utf-8">
<title>CodeIgniter encryption key generator</title>
<meta name="description" content="Generates a random, 32 character string to be used by CodeIgniter&#8217;s encryption class.">
<pre><code><?php echo '$config[\'encryption_key\'] = \'' . generate_token(32) . '\';'; ?></code></pre>
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