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Frequently Asked Questions (FAQ)

This page attempts to answer the more common questions you might have. Many of the answers refer you to other pages for details.

  • To ask a question use the questions? page
  • For frequently requested features, see the PITS pages.

Questions

How do I get my question answered?

The quickest and best way is to join the pmwiki-users mailing list and post your question there. If it really is a frequently-asked question, it will eventually be added to this page.

An alternative way is to leave your question on the Questions page.

Getting help

Where can I get help with Pm Wiki? (This is a pretty vague question!)

See this FAQ, Troubleshooting, or try a Search.

Error messages

What does warning message or error message "xxxxx" mean?

Error/warning questions and answers are on the Troubleshooting page.

Basic Editing

I'm new to Pm Wiki, where can I find some basic help for getting started?

This Basic Editing page is a good start. From there, you can just follow the navigational links at the bottom of the page (they are called WikiTrails) to the next pages, or to the Documentation Index page, which provides an outline style index of essential documentation pages, organized from basic to advanced.

How do I include special characters on my wiki pages?

Use character codes to insert special characters, such as Copyright (©) and Trademark (® or ™) symbols, that don't appear on your keyboard.

Links

How do I put a link that will open as a new window?

Use the %newwin% wikistyle, as in:

%newwin%http://www.example.com/

http://www.example.com/

How do I place a mailing address in a page?

Use the mailto: markup, as in one of the following:

    mailto:myaddress@example.com
    [[mailto:myaddress@example.com]]
    [[mailto:myaddress@example.com | email me]]

See also Cookbook:EProtect for information on protecting email addresses from spammers.

How do I make a Wiki Word link to an external page instead of a Wiki Page?

Use link markup. There are two formats:

    [[http://www.example.com/ | WikiWord]]
    [[WikiWord -> http://www.example.com/]]

How do I find all of the pages that link to another page (i.e., backlinks)?

Use the link= option of the (:pagelist:) directive, as in

    (:pagelist link=SomePage:)   -- show all links to SomePage
    (:pagelist link={$FullName}:)  -- show all links to the current page

Uploads

How do I link to an uploaded file or image from another group?

Use Attach:Groupname./filename.ext . Note the extra dot after the group name.

When I upload a file, how do I make the link look like "file.doc" instead of "Attach:file.doc Δ"?

Use parentheses, as in [[(Attach:)file.doc]]. There is also a configuration change that can eliminate the Attach: -- see Cookbook:AttachLinks.

Why can't I upload files of size more than 50kB to my newly installed Pm Wiki?

Out of the box Pm Wiki limits the size of files to be uploaded to 50kB. Add

        $UploadMaxSize = 1000000;

to your config.php to increase the limit to 1MB (for example). See UploadsAdmin for how to further customize limits. Note that both PHP and webservers also place their own limits on the size of uploaded files.

Tables

How do I create nice tables similar to Product X?

See tables and table directives.

Table Directives

Can I define table headers using the advanced markup?

See Pm's reply to pending PITS:00535

Wiki Styles

Some of my colors aren't working! For example, %color=#AAAAAA% works, but %color=#AA3333% doesn't work. What's wrong?

Be sure to use lowercase letters for rgb hex colors, otherwise Pm Wiki may mistake the color value for a WikiWord.

Page Directives

Can I get (:redirect:) to return a "moved permanently" (HTTP 301) status code?

Use (:redirect PageName status=301:).

Is there any way to prevent the "redirected from" message from showing at the top of the target page when I use (:redirect:)?

If you want to suppress the message...

  • in all cases, add add $PageRedirectFmt = ''; in your local/config.php
  • based on the destination/target of the redirect, add $PageRedirectFmt = ''; to a local/group.page.php or local/group.php file (see PmWiki.PerGroupCustomizations).
  • based on the origin/source of the redirect, add the following to your local/config.php
   if (@$_GET['from']) {
     $group = PageVar($_GET['from'], '$Group');
     if ($group == 'SomeGroup') $PageRedirectFmt = '';
   }
Example application: Replace 'Some Group?' with 'Profiles'

Include Other Pages

What's the maximum number of includes that can exist in a page? My site seems to stop including after 48 includes.

By default, Pm Wiki places a limit of 50 include directives for any given page, to prevent runaway infinite loops and other situations that might eat up server resources. The limit can be modified by the wiki administrator via the $MaxIncludes variable.

Page-specific Variables

Is there a variable like $LastModified, but which shows me the creation time?

No, but you can create one in config.php. For instance:

# add page variable {$PageCreationDate} in format yyyy-mm-dd
$FmtPV['$PageCreationDate'] = 'strftime("%Y-%m-%d", $page["ctime"])';

Group Headers

How do I set one header for all pages/groups?

The header for each page is controlled by the $GroupHeaderFmt variable. Thus a site-wide groupheader can be added with

$GroupHeaderFmt = '(:include {$SiteGroup}.SiteHeader:)(:nl:)' . $GroupHeaderFmt;

(note that single quotes must be used so that $Group (which is part of the default contents of $GroupHeaderFmt) will be substituted properly by Pm Wiki, and that this applies to all variables ending in $...Fmt)

See also the Cookbook:AllGroupHeader page.

Any form of markup is valid in $GroupHeaderFmt, thus one can do

$GroupHeaderFmt .= "Global markup text here.";

Page History

Is there a way to remove page history from page files?

1. Administrators can clean page histories using the Cookbook:ExpireDiff recipe.

2. Administrators with FTP file access can download individual pages from the wiki.d directory, open them in a text editor, manually remove history, and re-upload the files to wiki.d/ directory. Care must be exercised, when manually editing a page file, to preserve the minimum required elements of the page and avoid corrupting its contents. See PageFileFormat#creating.

3. Edit the page. Select all the contents of the edit text area and cut them to the clipboard. Enter delete into the text area and click on the save and edit button. Select all the contents of the edit text area and paste the contents of the clipboard over them. Click on the save button. This will remove all of the page's history up to the final save in which the pasted material is re-added.

How can I restrict viewing the page history to people with edit permission?

In the local/config.php file, set

$HandleAuth['diff'] = 'edit';

Passwords

How can I password protect all the pages and groups on my site? Do I really have to set passwords page by page, or group by group?

Administrators can set passwords for the entire site by editing the config.php file; they don't have to set passwords for each page or group. For example, to set the entire site to be editable only by those who know an "edit" password, an administrator can add a line like the following to local/config.php:

    $DefaultPasswords['edit'] = crypt('edit_password');

For more information about the password options that are available only to administrators, see PasswordsAdmin.

How can I create private groups for users, so that each user can edit pages in their group, but no one else (other than the admin) can?

Administrators can use the AuthUser recipe and add the following few lines to their local/config.php file to set this up:

    $group = Fmt Page Name('$Group', $pagename); 
$DefaultPasswords['edit'] = 'id:'.$group;
include_once("$FarmD/scripts/authuser.php");

This automatically gives edit rights to a group to every user who has the same user name as the group name.

Page Lists

How can I configure my site to always exclude wiki-related pages from searches?

Try the following in your local/config.php file. See also Cookbook:SearchPatterns.

## Exclude Certain pages / groups from search results.
$SearchPatterns['default'][] = '!\\.(All)?Recent(Changes|Uploads|Comments)$!';
$SearchPatterns['default'][] = '!\\.Group(Print)?(Header|Footer|Attributes)$!';
$SearchPatterns['default'][] = '!\\.(Left|Right|Side)(Bar|Menu|Note)$!';
$SearchPatterns['default'][] = '!^Site\\.!';
$SearchPatterns['default'][] = '!^PmWiki\\.!';

If you add $SearchPatterns['default']... to exclude groups and pages from pagelist and search output, you can include the omitted pages by using "list=all" in the pagelist or search parameters.

PmWiki Installation

How do I make pmwiki.php the default page for a website? Should I rename pmwiki.php to index.php?

Renaming pmwiki.php is not recommended. Instead, create an index.php file that contains the single line:

<?php include_once('pmwiki.php');

You may also want to check Cookbook:CleanUrls.

Why does pmwiki.org appear to have a directory structure rather than "?n=pagename" in urls?

Pmwiki.org uses a variant of Cookbook:CleanUrls.

Is it possible to move wiki.d to /tmp/persistent/wiki.d (a new sourceforge rule)?

Sourceforge suggests moving everything to /tmp/persistent/new-folder-of-your-choice and creating a symbolic link to the new folder on /tmp . It works -- see Cookbook:SourceForgeServers.

How can I run Pm Wiki on a standalone (offline, portable) machine ?

See Cookbook:Standalone.

Local Customizations

How do I get the group / page name in a local configuration file (e.g. local/config.php)?

Use the following markup in pmwiki-2.1.beta21 or newer:

## Get the group and page name
$pagename = ResolvePageName($pagename);
$group = PageVar($pagename, '$Group');
$name = PageVar($pagename, '$Name');

Can I remove items from the wikilib.d folder on my site?

Yes, the files in wikilib.d/ can be safely removed. They'll reappear again when you upgrade, however. If you want to permanently configure your site so that these distribution pages don't appear, try:

$WikiLibDirs = array(&$WikiDir);

How do I customize my own 404 error page for non-existent pages?

To change the text of the message, try editing the Site.PageNotFound page.

Skins

How do I change the Wiki's default name in the upper left corner of the Main Page?

Put the following config.php

$WikiTitle = 'My Wiki Site';

The docs/sample-config.php file has an example of changing the title.

How can I embed Pm Wiki pages inside a web page?

Source them through a PHP page, or place them in a frame.

How do I change the font or background color of the hints block on the Edit Page?

Add a CSS style to pub/css/local.css: .quickref {background:...; color:... }. The hints are provided by the Site.EditQuickReference page, which is in the Pm Wiki or Site wikigroup. Edit that page, and change the "bgcolor" or specify the font "color" to get the contrast you need.

Passwords Admin

There seems to be a default password. What is it?

There isn't any valid password until you set one. PasswordsAdmin describes how to set one.

Pm Wiki comes "out of the box" with $DefaultPasswords['admin'] set to '*'. This doesn't mean the password is an asterisk, it means that default admin password has to be something that encrypts to an asterisk. Since it's impossible for the crypt() function to ever return a 1-character encrypted value, the admin password is effectively locked until the admin sets one in config.php.

How do I use passwd-formatted files (like .htpasswd) for authentication?

See AuthUser or Cookbook:UserAuth

Is there anything I can enter in a Group Attributes field to say 'same as the admin password'? If not, is there anything I can put into the config.php file to have the same effect?

For the sitewide edit password (in config.php), use '@_site_edit'. I haven't tested this, but I think one can also use '@_site_admin', '@_site_read', '@_site_attr', etc. for the other site-wide passwords set in config.php. '@admin' is used to specify the site admin password.

How do I edit protect, say, all Recent Changes pages?

(needs answer)

Uploads Administration

How do I disable uploading of a certain type of file?

Here's an example of what to add to your local/config.php file to disable uploading of .zip files:

$UploadExtSize['zip'] = 0; # Disallow uploading .zip files.

How do I attach uploads to individual pages or the entire site, instead of organizing them by wiki group?

Use the $UploadPrefixFmt variable (see also the Cookbook:UploadGroups recipe).

$UploadPrefixFmt = '/$FullName'; # per-page
$UploadPrefixFmt = ''; # site-wide

Internationalizations

If my wiki is internationalized by config.php, how do I revert a specific group to English?

Use $XLLangs = array('en'); in the group.php configuration file.

Custom Markup

How can I embed Java Script? into a page's output?

There are several ways to do this. The Cookbook:JavaScript recipe describes a simple means for embedding static Java Script into web pages using custom markup. For editing Java Script directly in wiki pages (which can pose various security risks), see the JavaScript-Editable recipe. For Java Script that is to appear in headers or footers of pages, the skin template can be modified directly, or <script> statements can be inserted using the $HTMLHeaderFmt array.

Troubleshooting

Why am I seeing strange errors after upgrading?

Make sure all of the files were updated, in particular pmwiki.php.

This question sometimes arises when an administrator hasn't followed the advice, which used to be less prominent, on the installation and initial setup tasks pages and has renamed pmwiki.php instead of creating an index.php wrapper script. If you have renamed pmwiki.php to index.php, then the upgrade procedure won't have updated your index.php file. Delete the old version and create a wrapper script so it won't happen again.

Sometimes an FTP or other copy program will fail to transfer all of the files properly. One way to check for this is by comparing file sizes.

Be sure all of the files in the wikilib.d/ directory were also upgraded. Sometimes it's a good idea to simply delete the wikilib.d/ directory before upgrading. (Local copies of pages are stored in wiki.d/ and not wikilib.d/.)

I'm suddenly getting messages like "Warning: fopen(wiki.d/.flock): failed to open stream: Permission denied..." and Cannot acquire lockfile"... what's wrong?

Something (or someone) has changed the permissions on the wiki.d/.flock file or the wiki.d/ directory such that the webserver is no longer able to write the lockfile. The normal solution is to simply delete the .flock file from the wiki.d/ directory -- Pm Wiki will then create a new one. Also be sure to check the permissions on the wiki.d/ directory itself. (One can easily check and modify permissions of the wiki.d/ directory in Filezilla (open-source FTP app) by right-clicking on the file > File attributes)

My links in the sidebar seem to be pointing to non-existent pages, even though I know I created the pages. Where are the pages?

Links in the sidebar normally need to be qualified by a WikiGroup in order to work properly. Otherwise they will point to whatever group you happen to be viewing the sidebar in.

Why am I seeing "Warning: Cannot modify header information - headers already sent ..." messages at the top of my page.

If this is the first or only error message you're seeing, it's usually an indication that there are blank lines or spaces before the <?php or after the ?> in a local customization file. Double-check the file and make sure there aren't any blank lines or spaces before the initial <?php. It's often easiest and safest to eliminate any closing ?> altogether.

If the warning is appearing after some other warning or error message, then resolve the other error and this warning may go away.

Why is Pm Wiki prompting me multiple times for a password I've already entered?

Usually this is an indication that the browser isn't accepting cookies, or that PHP's session handling functions on the server aren't properly configured. If the browser is accepting cookies, then try setting $EnableDiag=1; in local/config.php, run Pm Wiki using ?action=phpinfo, and verify that sessions are enabled and that the session.save_path has a reasonable value. Note that several versions of PHP under Windows require that a session_save_path be explicitly set (this can be done in the local/config.php file).

I edited config.php, but when I look at my wiki pages, all I see is "Parse error: parse error, unexpected T_VARIABLE in somefile on line number."

You've made a mistake in writing the PHP that goes into the config.php file. The most common mistake that causes the T_VARIABLE error is forgetting the semi-colon (;) at the end of a line that you added. The line number and file named are where you should look for the mistake.

Searches and pagelists stopped working after I upgraded -- no errors are reported, but links to other pages do not appear (or do not appear as they should) -- what gives?

Be sure all of the files in the wikilib.d/ directory were also upgraded. In particular, it sounds as if the Site.Page List Templates page is either missing (if no links are displayed) or is an old version (if the links do not appear as they should).

Some of my posts are coming back with "403 Forbidden" errors or "Not Acceptable"? This happens with posts containing "wget", "curl", "file(" or ...

Your webserver probably has mod_security(approve sites) enabled. The mod_security "feature" scans all incoming posts for forbidden words or phrases that might indicate someone is trying to hack the system, and if any of them are present then Apache returns the 403 Forbidden error. Common phrases that tend to trigger mod_security include "curl ", "wget", and "file(", although there are many others.

Since mod_security intercepts the requests and sends the "forbidden" message before Pm Wiki ever gets a chance to run, it's not a bug in Pm Wiki, and there's little that Pm Wiki can do about it. Instead, one has to alter the webserver configuration to disable mod_security or reconfigure it to allow whatever word it is forbidding. Some sites may be able to disable mod_security by placing SecFilterEngine off in a .htaccess file.

Web Feeds

How can I use the RSS <enclosure> tag for podcasting?

For podcasting of mp3 files, simply attach an mp3 file to the page with the same name as the page (i.e., for a page named Podcast.Episode4, one would attach to that page a file named "Episode4.mp3"). The file is automatically picked up by ?action=rss and used as an enclosure.

The set of potential enclosures is given by the $RSSEnclosureFmt array, thus

$RSSEnclosureFmt = array('{$Name}.mp3', '{$Name}.wma', '{$Name}.ogg');

allows podcasting in mp3, wma, and ogg formats.

How to add "summary" to the title in a rss feed (ie. with ?action=rss)?

Add this line in you local/config.php

$FeedFmt['rss']['item']['title'] = '{$Group} / {$Title} : $LastModifiedSummary';

How do I insert RSS news feeds into Pm Wiki pages?

See Cookbook:RssFeedDisplay.

Design Notes

Why doesn't Pm Wiki use hierarchical / nested groups?

It essentially comes down to figuring out how to handle page links between nested groups; if someone can figure out an obvious, intuitive way for authors to do that, then nested groups become plausible. See DesignNotes and PmWiki:HierarchicalGroups.

Why don't Pm Wiki's scripts have a closing ?> tag?

All of Pm Wiki's scripts now omit the closing ?> tag. The tag is not required, and it avoids problems with unnoticed spaces or blank lines at the end of the file. Also, some file transfer protocols may change the newline character(s) in the file, which can also cause problems. See also the Instruction separation(approve sites) page in the PHP manual(approve sites).

Does Pm Wiki support WYSIWYG editing (or something like the FCK Editor?)?

Short answer: Pm Wiki provides GUI buttons in a toolbar for common markups, but otherwise does not have WYSIWYG editing. For the reasons why, see PmWiki:WYSIWYG.

Access Keys

How can I change the keyboard shortcuts for editing and saving a page?

The default access key values can be changed by site administrators using the string mapping methods to customize a site for other languages by modifying the config.php file. See Internationalizations. Individuals who want to customize the keys used by their browser can use a similar string mapping approach by posting a special query parameter that sets a cookie on their browser. See Site.Preferences.

Skin Templates

How do I customize the CSS styling of my Pm Wiki layout?

See Skins for how to change the default Pm Wiki skin. See also Cookbook:Skins, where you will find pre-made templates you can use to customize the appearance of your site. You can also create a file called local.css in the pub/css/ directory and add CSS selectors there (this file gets automatically loaded if it exists). Or, styles can be added directly into a local customization file by using something like:

$HTMLStylesFmt[] = '.foo { color:blue; }';

Where can the mentioned "translation table" be found for adding translated phrases?

See Internationalizations.

Images

How do I insert pictures on wiki pages?

See Images.

Spam

I'm getting a lot of spam on my wiki site. How can I password protect the pages?

See Security, UrlApprovals, and the Cookbook:Blocklist2 recipe.

Summary pages

Why are 'Recent Changes' pages editable?

You might want to edit these pages if a spammer creates a page with an unsavory name. To prevent others from editing these pages, insert the following lines into your local/config.php file. Editing then requires the admin password.

## Require admin password to edit RecentChanges (etc.) pages.
if ($action=='edit'
    && preg_match('/\\.(All)?RecentChanges$/', $pagename))
  { $DefaultPasswords['edit'] = '*'; }

How do I generate RSS feeds from Pm Wiki?

See Web Feeds.

Disable formatting

How do I put plain text into a wiki page and disable wiki formatting?

You can use the [@TEXT GOES HERE@] markup as explained in the section Escape Sequence TextFormattingRules. Note that this preserves any text file formatting such as newlines and spaces.

Read-access to pages in the Site wikigroup

What pages in the Site wikigroup need to be unrestricted for reading by any user of the wiki?

The following pages probably need to be accessible (see Site.Site):

Site.Search
The names of other pages will vary from skin to skin, but you will also want to enable reading of the pages that make up the banner and footer areas of the site.

Category: Questions

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Page last modified on August 15, 2006, at 05:51 PM