How to organize Code igniter 4 mail with multi-input post

I don't get what you don't know exactly.
Like this?

PHP Code:

$email->setMessage(
    $this->request->getVar('one')
    . $this->request->getVar('two')
    . $this->request->getVar('three')
); 


I have a mail form with multi- input as follow:

Code:

<form>
     <input name="var1">
<input name="var2">
<input name="var3">
<input name="var4">
<input name="var5">
<input name="var6">
<input name="var7">
<input name="var8">
</form>

I want thise inputs to work on a post to mail as I asked above thank you whether HTML/TEXT

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