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I would like to know how can I send the form after the validation?

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This is my validation function

class emailValidation {
    public $emailMessage="";
    function checkemail($emailText) {
        return (!preg_match("/^([a-z0-9\+_\-]+)(\.[a-z0-9\+_\-]+)*@([a-z0-9\-]+\.)+[a-z]{2,6}$/ix", $emailText) ) ? FALSE : TRUE;
    function columbia($emailText){
        return (!preg_match("/@([\w-])+\.co$/mi", $emailText)) ? FALSE : TRUE;

    function validation(){
            if (empty($_POST["emailText"])) {
              $this->emailMessage = "Email is required";
            } else {
              $emailText = $_POST["emailText"];
                if (!$this->checkEmail($emailText)) {
                 $this->emailMessage = "Invalid email format";
                if ($this->columbia($emailText)) {
                    $this->emailMessage = "We do not accept emails from Columbia";

and this is data insert function


class subscribers extends dbConnection{

    public function insertSubscribers(){
        if (isset($_POST["emailSubmit"])) {

            $sql = "INSERT INTO subscribers (email) VALUES ('$email');";
            $result = $this->connect()->query($sql);
            header("Location: /success.html");

I am thinking to put insertSubscribers() into the validation() function

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