【PHP】計算含稅、未稅、完稅價格

表單↓

<form name="form1" method="post" action="text11.php">

<input type="text" name="value1" required>
<input type="submit" value="計算">

</form>

PHP↓

<?php

	$value1=$_REQUEST['value1'];
	$value2=$value1*0.05;
	$value3=$value1+$value2;

	echo '(1)未稅額' , $value1 ;
	echo '<br>';
	echo '(2)稅額' , $value2;
	echo '<br>';
	echo '(3)含稅總金額' , $value3;

?>