Need a more elegant way of bitwise ORing values

[Richard Davey <rich@xxxxxxxxxxxxx>]

Hi all,

Can anyone think of a more elegant way of achieving the following?

<?php
$flags = array();

if ($allow_fraction)
{
    $flags[] = FILTER_FLAG_ALLOW_FRACTION;
}

if ($allow_thousand)
{
    $flags[] = FILTER_FLAG_ALLOW_THOUSAND;
}

if ($allow_scientific)
{
    $flags[] = FILTER_FLAG_ALLOW_SCIENTIFIC;
}

if (count($flags) > 0)
{
    $c = '$c = ' . implode('|', $flags) . ';';
    eval($c);
    $filter['flags'] = $c;
}
?>

The code checks for 3 booleans ($allow_fraction, etc) and if true it
adds the const to the $flags array. At the end each value in the array
is joined together into a string (the implode part), which would give
something like: 4096|8192 - but I then need to return the actual value
from this operation, so I'm eval'ing it.

I don't like using eval, so can anyone think of a better way to do
this? All I need as an end result if the product of the bitwise
operation (i.e. an integer) stored in $filter['flags']

Cheers,

Rich
-- 
Zend Certified Engineer
http://www.corephp.co.uk

"Never trust a computer you can't throw out of a window"

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