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Illegal string offset error


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Can anyone tell me what is wrong with the code below?

I'm getting a Warning: Illegal string offset 'redirect' in... error in this line:

if (preg_match("/aeid/", $confirmation['redirect'])){

I've just updated php to 5.4 and I get the error when I submit a gravity form for wordpress via ajax

function salesmod_confirm_change($confirmation, $form, $lead, $ajax){
if (preg_match("/aeid/", $confirmation['redirect'])){
if (!$_GET['cfn']) {
$confirm_id = substr(md5( substr(md5(time()), 0, 16)), 0, 16);
gform_update_meta($lead['id'], 'confirmation_id', $confirm_id);
} else {
$confirm_id = $_GET['cfn'];

$confirmation = array('redirect' => $confirmation['redirect'] . "&cfn=" . $confirm_id);
return $confirmation;


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