Help, some simple php & html program don't work normal in xampp
example:
calcule.html
<form action="bcalcule.php" method="post">
<input type="text" name="za" value="0">
<br>
<select name="acalc">
<option selected>+</option>
<option>-</option>
<option>*</option>
<option>/</option>
</select>
<br>
<input type="text" name="xa" value="0">
<br>
<input type="submit" name="ans" value="ok"><input type="reset" name="reset" value="reset">
</form>
bcalcule.php
<?
$a_acalc="+";
$b_acalc="-";
$c_acalc="*";
$d_acalc="/";
$acalc=$_POST['acalc'];
if($acalc==$a_acalc){
$va = $za + $xa;
echo "answer is $va";
} if($acalc==$b_acalc){
$va = $za - $xa;
echo "answer is $va";
} if($acalc==$c_acalc){
$va = $za * $xa;
echo "answer is $va";
} if($acalc==$d_acalc){
$va = $za / $xa;
echo "answer is $va";
}
?>
I know that my source code is right, but in xampp I get always answer 0