如何使用php初始化带有特征的对象内的属性？

The environment I have set up is using MAMP with php version 7.2.14 and PhpStorm. Based on the PHP: Trait - Manual,

traits are mechanisms for code reuse in single inheritance languages...

I have created a ValidationHelper.php trait to help validate form data. Pear has validation functionality like email($email_addr) that accepts an email address to validate. Calling this class statically appears to no longer be ideal, so I am attempting to instantiate it. Php throws an error if you attempt to initialize a property with an object, therefore, I added a constructor to instantiate the object. The PHP: Trait - Manual also states that

It is not possible to instantiate a Trait on its own.

On its own being the key phrase for ambiguity. With that being said, how would you add a constructor that initializes some property, or instantiate an object using a trait?

Can Traits have properties...Constructors is where I read that traits can have these members. I do see that they included a constructor, but not 100% sure how it works.

include_once 'Pear/Validate.php';
trait ValidationHelper
{

    protected $validate;

    public function __constructor(){
        $this->validate = new Validate();
    }

    public function validate_email($email){
        return $this->validate->email($email); //$validate is null
    }

}

Instead of trying to instantiate an object within a trait, instantiate it within your hierarchal system.

include_once 'Pear/Validate.php';
class My_Object_Class
{
    protected $validate;
    public function __construct(){
        $this->validate = new Validate();
    }
}