Your checks are something like if($user['tom'] & $perm['read']) echo 'Tom can read';
Only the 3rd bit is checked, all others are ignored and won't do any harm.
Anyway, the "clean" way of setting permissions is: $user['tom'] = $perm['execute'] | $perm['write'] | $perm['read'];
Understood. It cant be illegal if its set as you described.
$compare = $perm_total & $user_perm; unsets all bits other than 1, 2 and 4, so 0 =< $compare =< 7. However, your first condition already did this.
Ok.
So here is the updated code ->
-- start code -- <?php
$perm = $user = array(); $perm_total = 0;
// Permissions from some source like a database/file $perm['execute'] = 1; $perm['write'] = 2; $perm['read'] = 4;
// User permissions (predetermined) from sessions maybe
$user['tom'] = $perm['read'] | $perm['write'] | $perm['execute']; // rwx
$user['joe'] = $perm['read'] | $perm['execute']; // rx
$user['whats_his_face'] = $perm['read'] | $perm['write']; // rw
// Set the sum of "source" permissions
foreach($perm as $value)
{
$perm_total |= $value;
}echo "<ul>";
// Loop over the users
foreach($user as $id => $user_perm)
{
// Compare user bits to permission bits
$compare = $perm_total & $user_perm; // Make it an even 4 bit string (for visual effect)
$bits_string = sprintf("%03d", decbin( $compare ));echo "<li>User: " . $id . "</li>";
// Check to see if the comparision contains any permission bits
$can_read = (($compare & $perm['read']) == $perm['read']) === TRUE ? "TRUE" : "FALSE";
$can_write = (($compare & $perm['write']) == $perm['write']) === TRUE ? "TRUE" : "FALSE";
$can_execute = (($compare & $perm['execute']) == $perm['execute']) === TRUE ? "TRUE" : "FALSE";
echo "<ul>";
echo "<li>" . $user_perm . ' -> ' . $bits_string . "</li>";
echo "<li>Can Read: $can_read</li>";
echo "<li>Can Write: $can_write</li>";
echo "<li>Can Execute: $can_execute</li>";echo "</ul>"; }
echo "</ul>";
?> -- end code --
So if thats it, now its time to expand on this idea on my end... Thanks
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