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Function to retrieve the forums a user can access
by
05 Aug 2002
This is something I once wrote for someone (think it was merk?), and kept it in a file, and finally got around to clean it up and wrap it in a function.
Very useful for some hacks, hope this helps at least some of you.
Here is the full function, along with some basic instructions:
PHP Code:
/***********************************************************************
* Parameters:
* 1. The name of the permission you want to check for.
* Alternatively, it can take an array of permissions.
* Defaults to 'canview'.
* 2. The user ID of the user you are checking permissions for.
* Defaults to -1 (i.e current viewer).
* 3. The separator for the list of forum ID's.
* Return:
* 1. If the first parameter is a string, the function will
* return the list of forum ID's.
* 2. If the first parameter is an array, the function will
* return an associative array of permission => forum ID's.
* Example usage:
* 1. get_allowed_forums();
* Will return the list of forums the current user can view:
* 1,5,6,8
* 2. get_allowed_forums(array('canview', 'canpostnew'), 2);
* Will return an array that contains two keys, canview and
* canpostnew, each referring to the list of forums user
* number 2 can access:
* Array
* (
* [canview] => 3,5,7,8
* [canpostnew] => 3,7
* )
**********************************************************************/
function get_allowed_forums ($checkfor = 'canview', $userid = -1, $separator = ',') {
global $permissions, $DB_site, $bbuserinfo, $enableaccess, $hideprivateforums;
if ($userid == -1) {
$userinfo = $bbuserinfo;
} else {
$userinfo = getuserinfo($userid);
}
if (is_array($checkfor)) {
$select = implode(', ', $checkfor);
} else {
$select = $checkfor;
}
$forumpermissions = $DB_site->query("
SELECT forumid, $select
FROM forumpermission
WHERE usergroupid = $userinfo[usergroupid]
");
while ($forumpermission = $DB_site->fetch_array($forumpermissions)) {
$forumpermscache[$forumpermission['forumid']] = $forumpermission;
}
if ($userinfo['userid'] != 0 and $enableaccess) {
$accesspermissions = $DB_site->query("
SELECT forumid, accessmask
FROM access
WHERE userid = $userinfo[userid]
");
while ($accesspermission = $DB_site->fetch_array($accesspermissions)) {
$accesscache[$accesspermission['forumid']] = $accesspermission;
}
if (is_array($checkfor)) {
foreach ($checkfor as $permname) {
$usergroupdefault[$permname] = $permissions[$permname];
$nopermissions[$permname] = 0;
}
} else {
$usergroupdefault = array(
$checkfor => $permissions[$checkfor]
);
$nopermissions = array(
$checkfor => 0
);
}
}
// (This is a really really fast query since it only
// uses the index and not the actual table.)
$forums = $DB_site->query('SELECT forumid FROM forum');
while ($forum = $DB_site->fetch_array($forums)) {
if ($enableaccess and is_array($accesscache[$forum['forumid']])) {
if ($accesscache[$forum['forumid']]['accessmask'] == 1) {
$forumperms = $usergroupdefault;
} else {
$forumperms = $nopermissions;
}
} elseif (is_array($forumpermscache[$forum['forumid']])) {
$forumperms = $forumpermscache[$forum['forumid']];
} else {
$forumperms = $permissions;
}
if (is_array($checkfor)) {
foreach ($checkfor as $permname) {
if ((!$hideprivateforums and $permname == 'canview') or $forumperms[$permname]) {
if ($allowedforums[$permname]) {
$allowedforums[$permname] .= $separator;
}
$allowedforums[$permname] .= $forum['forumid'];
}
}
} else {
if ((!$hideprivateforums and $checkfor == 'canview') or $forumperms[$checkfor]) {
if ($allowedforums) {
$allowedforums .= $separator;
}
$allowedforums .= $forum['forumid'];
}
}
}
return $allowedforums;
}
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