Question

Here’s the loop and code:

$rev_sel = 0.01;
    for($i=1.00; $i>=0; $i=$i-.01) {
        $val = $i;
        $val2 = $val * 100;
        echo "<option value='".$i."'";
        if($i == $rev_sel) echo "selected='selected'";
        echo ">".$val2."%</option>";
        }

As far as I can tell, this should end up with the 1% being selected when it pops up, or whatever $rev_sel is set to between 0 and 1.00. It isn’t the case. Anybody know why?

Answer 1

You do need to round like so:

<?php
$rev_sel = 0.01;
    for($i=1.00; $i>=0; $i=$i-.01) {
        $val = round($i, 2);
        $val2 = $val * 100;
        echo "<option value='".round($i,2)."'";
        if(round($i,2) == $rev_sel) echo "selected='selected'";
        echo ">".$val2."%</option>\n";
        }

Your code was outputting:

<option value='0.13'>13%</option>
<option value='0.12'>12%</option>
<option value='0.11'>11%</option>
<option value='0.099999999999999'>9.9999999999999%</option>
<option value='0.089999999999999'>8.9999999999999%</option>
<option value='0.079999999999999'>7.9999999999999%</option>
<option value='0.069999999999999'>6.9999999999999%</option>

0.00999999… etc is not equal to 0.01