When the button’s title same as a function name, it will display as blank.

[he426100]

example:

<?php declare(strict_types=1);

use Tkui\Widgets\Frame;
use Tkui\Widgets\Buttons\Button;

require_once dirname(__FILE__) . '/DemoAppWindow.php';

$win = new DemoAppWindow('button test');

$f = new Frame($win);
$win->pack($f);
$f->pack(new Button($f, 'test'));
$win->run();

function test()
{}

result

[he426100]

I should avoid defining a function with the same name as option value?

/**
     * Create Tk widget.
     */
    protected function make(): void
    {
        // callable options cannot be serialized to a Tcl string
        // initialize them after the widget will be created.
        /** @var array<string, callable> $callables */
        $callables = array_filter($this->options->toArray(), 'is_callable');

        $plainOptions = $this->options->except(...array_keys($callables));

        // create the widget with only simple (int, string, etc) options.
        $this->eval->tclEval($this->widget, $this->path(), ...$plainOptions->toStringList());

        // now callables can be initialized.
        foreach ($callables as $option => $callable) {
            $this->{$option} = $callable;
        }
    }

[skoro]

Hi @he426100,
Yes, you have to avoid the function with the same name as the button title. This is because some widget options can be callable (in terms of PHP) which are not acceptable for Tcl engine, that is why such options should be removed before passing to Tcl and then putting back again as you can see in TkWidget::make() method.