An example

Comments and explanations to be completed at a later time.

Simple.class.php

<?php
function makeSimple($text) {
    return new Simple($text);
}

function printSimple($simple) {
    $simple-> doPrint();
}

class Simple
{
    public $text;
    
    public function __construct($text) {
        $this->text = $text;
    }
    
    public function doPrint() {
        echo $this->text;
    }
    
    protected function changeText($text) {
        $this->text = $text;
    }
}

class Simple2 extends Simple{
    public function __construct($text) {
        parent::__construct($text);
    }
    
    public function makeChange($text) {
        changeText($text);
    }
}
?>

src/test/Simple.hx

package test;

extern class Simple 
{
    static function __init__():Void untyped {
        __call__("require_once", "Simple.class.php");
    }

    public var text:Dynamic;
    
    public function new(something:Dynamic):Void;
    public function doPrint():Void;
    function changeText(text:Dynamic):Void;
}

src/test/Simple2.hx

package test;

extern class Simple2<T> extends Simple
{
    static function __init__():Void {
        untyped __call__("require_once", "Simple.class.php");
    }
    
    public function new(text:T):Void;
    
    public function makeChange(text:T):Void;
}

src/test/SimpleHelper.hx

package test;

class SimpleHelper {
    public static inline function makeSimple(text):Simple return untyped __call__("makeSimple", text)
    public static inline function makeSimple2<T>(vari:T) return new Simple2(vari)
    public static inline function printSimple(simple:Simple) untyped __call__("printSimple", simple)
}