foreach() error Warning: Invalid argument supplied for foreach()

i keep getting this error for an array of errors that i have set in a method

here is the code

public function showerrors() {
        echo "<h3> ERRORS!!</h3>";
        foreach ($this->errors as $key => $value)
        {
            echo $value;
        }
    }

i keep getting this "Warning: Invalid argument supplied for foreach()" when i run the program i set the errors array in the constructor like this

 $this->errors = array();

so im not entirely sure why it wont print the errors!

public function validdata() {
        if (!isset($this->email)) {
            $this->errors[] = "email address is empty and is a required field";
        }

        if ($this->password1 !== $this->password2) {
            $this->errors[] = "passwords are not equal ";
        }
        if (!isset($this->password1) || !isset($this->password2)) {
            $this->errors[] = "password fields cannot be empty ";
        }
        if (!isset($this->firstname)) {
            $this->errors[] = "firstname field is empty and is a required field";
        }
        if (!isset($this->secondname)) {
            $this->errors[] = "second name field is empty and is a required field";
        }

        if (!isset($this->city)) {
            $this->errors[] = "city field is empty and is a required field";
        }


        return count($this->errors) ? 0 : 1;
    }

here is how i add data to the array itself! thanks for the help also!

alright i added this to the method

public function showerrors() {
        echo "<h3> ERRORS!!</h3>";
        echo "<p>" . var_dump($this->errors) . "</p>";
        foreach ($this->errors as $key => $value)
        {
            echo $value;
        }

then it outputs on my page this

ERRORS!! string(20) "invalid submission!!" if i type nothing into my text boxes so its saying its a string??

here is my constructor also, soory about this im new to php!

  public function __construct() {

        $this->submit  = isset($_GET['submit'])? 1 : 0;
        $this->errors = array();
        $this->firstname = $this->filter($_GET['firstname']);
        $this->secondname = $this->filter($_GET['surname']);
        $this->email = $this->filter($_GET['email']);
        $this->password1 = $this->filter($_GET['password']);
        $this->password2 = $this->filter($_GET['renter']);
        $this->address1 = $this->filter($_GET['address1']);
        $this->address2 = $this->filter($_GET['address2']);

        $this->city = $this->filter($_GET['city']);
        $this->country = $this->filter($_GET['country']);
        $this->postcode = $this->filter($_GET['postcode']);


        $this->token = $_GET['token'];
    }

---

在默认（没有填写）验证的情况下，您的表单中设置了"invalid submission"消息，您省略括号[] ，导致$this->errors被一个普通字符串覆盖，而不是附加到数组。

// Change
$this->errors = "invalid submission";

//...to...
$this->errors[] = "invalid submission";

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