area (quick version)

[Zero-Affect]

function area($vals, $func='square') {
# base first in all calculations
/*
# This could of been used to identify what shape but i thought it would be easier to just simply type it out, you could edit this though.
$array = array(
1 => 'square', 
2 => 'rectangle', 
3 => 'parallelogram', 
4 => 'triangle'
);
*/
if ( !preg_match('/^[0-9]+(,[0-9]+)*$/', $vals) ) {
$ret_txt = 'You didn\'t input the correct value format.'; // could also be FALSE
}
if ( in_array($func, array('square','rectangle','parallelogram','triangle')) ) {
$ret_txt = 'You can only get the area of the following shapes, square, rectangle, parallelogram, triangle.'; // could also be FALSE
}
	$split_vals = explode(',', $vals);
  if ( in_array($func, array('rectangle','parallelogram')) && count($split_vals) == 2 ) {
$ret_txt = ($split_vals[0]) * ($split_vals[1]);
  } elseif ( $func == 'square' && count($split_vals) == 1 ) {
$ret_txt = ($split_vals[0]) * ($split_vals[0]);
  } elseif ( $func == 'triangle' && count($split_vals) == 2 ) {
$ret_txt = ($split_vals[0] / 2) * ($split_vals[1]);
  } else {
$ret_txt = 'You didn\'t input the correct values.'; // could also be FALSE
  }
return $ret_txt;
}
  echo area('3','square'); // results in 9
echo '
';
  echo area('2,4','triangle'); // results in 4
echo '
';
  echo area('3,5', 'rectangle'); // results in 15
echo '
';
  echo area('7,9', 'parallelogram'); // results in 63
echo '
';
  echo area('1,2', 'square'); // fails
echo '
';
  echo area('1', 'noidea'); // fails

May come in useful to people who need it, have fun...