help code error. signup.php?

[hjfxghd7]

Parse error: syntax error, unexpected '(', expecting ']' in /home/friendko/public_html/habitualdarkness/signup.php on line 42



<input type="hidden" name="activation_key" value="<?php echo "function genRandomString() {
$length = 10;
$characters = ’0123456789abcdefghijklmnopqrstuvwxyz’;
$string = ”;
for ($p = 0; $p < $length; $p++) {
-->line42 $string .= $characters[mt_rand(0, strlen($characters))];
}
return $string;
}"">