Example 1

$form = new Form('plugins-tinymce-form-1', 'vertical');

$form->addTextarea('tinymce-textarea', '', 'Enter content here', 'cols=100, rows=20, class=tinyMce');

$form->addPlugin('tinymce', '#tinymce-textarea');

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<div class="bs5-form-stacked-element mb-3">
	<label for="tinymce-textarea" class="form-label">
		Enter content here
	</label>
	<textarea id="tinymce-textarea" name="tinymce-textarea" cols="100" rows="20" class="tinyMce form-control"></textarea>
</div>

Example 2 - TinyMce with Word Characters counter

$form = new Form('plugins-tinymce-form-2', 'vertical');

$form->addTextarea('tinymce-textarea-2', '', 'Enter content here', 'cols=100, rows=20, class=tinyMce');

$form->addPlugin('tinymce', '#tinymce-textarea-2', 'word-char-count', array('maxCharacters' => 20));

Your copy of PHP Form Builder is NOT authorized.
About PHP Form Builder License

<div class="bs5-form-stacked-element mb-3">
	<label for="tinymce-textarea-2" class="form-label">
		Enter content here
	</label>
	<textarea id="tinymce-textarea-2" name="tinymce-textarea-2" cols="100" rows="20" class="tinyMce form-control"></textarea>
</div>