Mixing variables into an array when inserting values

You are creating a string ….

$sql=""ft_num"=>"".$ticket['number'].'","booking_id"=>"'.$ticket['booking'].'"';

… but expecting it to operate as an array…

array(
    $sql,
    'event_id' =>  $event['id'],

This has nothing to do with how WordPress does anything. This is pure PHP. You have literally created this:

array(
    [] => "ft_num"=>"'.$ticket['number'].'","booking_id"=>"'.$ticket['booking'].'",
    'event_id' =>  $event['id'],

You need to build the array dynamically.

 $dynargs = array(
     'event_id'                  =>  $event['id'],
     'original_ev'               =>  $event['id'],
     'age'                       =>  $customer['age']
 )

if ($customer['gender']=="F"){
    $table = "f_ti";
    $dynargs['ft_num'] = $ticket['number'];
    $dynargs['booking_id'] = $ticket['booking'];
} elseif ($customer['gender']=="M"){
    $table = "m_ti";
    $dynargs['ticket_num'] = $ticket['number'];
    $dynargs['mbooking_id'] = $ticket['booking'];
}
$this->edb->insert(
            $table,
            $dynargs
        );
return $this->edb->insert_id;

I wrote that on the spot. It may be buggy but that is the idea.

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