Difference between revisions of "Beginner's Guide to Programming"

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By [[User:Amckay|Alan McKay]]
By [[User:Amckay|Alan McKay]]
<div style="overflow:auto; height: 1px; ">
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[http://www.geeklog.net Geeklog] is a powerful weblog (blog) content management system (CMS) which is written in the popular programming language <a [http://www.php.net PHP], and uses the popular [http://www.mysql.com MySQL] database.  While Geeklog is powerful enough that many users will not have a need to write their own applications for it, it is flexible enough to allow those who do require extra functionality to do so easily.  These people write there programs in PHP, with some minor restrictions and using the Geeklog function library.
[http://www.geeklog.net Geeklog] is a powerful weblog (blog) content management system (CMS) which is written in the popular programming language <a [http://www.php.net PHP], and uses the popular [http://www.mysql.com MySQL] database.  While Geeklog is powerful enough that many users will not have a need to write their own applications for it, it is flexible enough to allow those who do require extra functionality to do so easily.  These people write there programs in PHP, with some minor restrictions and using the Geeklog function library.

Revision as of 17:45, 20 August 2005

By Alan McKay

Geeklog is a powerful weblog (blog) content management system (CMS) which is written in the popular programming language <a PHP, and uses the popular MySQL database. While Geeklog is powerful enough that many users will not have a need to write their own applications for it, it is flexible enough to allow those who do require extra functionality to do so easily. These people write there programs in PHP, with some minor restrictions and using the Geeklog function library.

Hello, World

The first program you write in any computer language is "Hello World", and here it is in Geeklog. This is saved in a file "hello.php" in Geeklog's "public_html" directory, and so is surfable at http://www.example.com/hello.php


require_once( 'lib-common.php' );
$display =  COM_siteHeader();
$display .= "Hello World";
$display .= COM_siteFooter();
echo $display;


There are a few important things to be noted from the given program.

  • geeklog programs stay in PHP mode - there is no flipping back and forth between PHP and HTML as is possible in the PHP language. This means that all programs have "<?php" on the first line, and "?>" on the last line, and everything in between is PHP code.
  • there is only ever 1 "echo" statement to spit out the HTML. The whole rest of the program up to this point is simply putting together a string of HTML which gets spit out at the bottom. For debugging purposes you can put "echo" statements elsewhere and this output will appear at the top of the screen. But aside from debugging, in general you only have a single "echo" statement at the bottom.
  • "lib-common.php" is the single file which must be included in all your Geeklog programs. It includes everything else you need unless you decide to make your own include files, so it's one-stop shopping.
  • there are functions in Geeklog to do lots of stuff for you - like for example COM_siteHeader() and COM_siteFooter(). In general Geeklog functions start with 2 or 3 capital letters and an understore - this tells you what type of function it is. Then the name of the function. COM_ functions are "common" functions - not a terribly meaningful name. But SEC_ functions like SEC_inGroup() which allows you to test if a user is in a particular group, allow your programs to access some of the powerful security features of Geeklog. And DB_ commands allow you to access the Geeklog database.


    Speaking of the powerful Geeklog security model (one of the key reasons I originally chose Geeklog for my sites), let's alter the hello world program such that any user in the "geeker" user group will see the "hello world" message, but anyone not in that group (which includes users not logged in) will get a "permission denied" error.

    require_once( 'lib-common.php' );
    $display =  COM_siteHeader();
    if ( SEC_inGroup( 'geeker' ) )
              $display .= "Hello World";
              $display .= "Access Denied";
    $display .= COM_siteFooter();
    echo $display;

    To check out the full range of security functions available to you, and how to use them, read the /path/to/geeklog/system/lib-security.php file, which is where they are implemented.

    Though the above code format is a bit clunky and not terribly useful, so let's make another change which shows us how most programs deal with group permissions issues.

    require_once( 'lib-common.php' );
    $display =  COM_siteHeader();
    if ( ! SEC_inGroup( 'geeker' ) )
              $display .= "Access Denied";
              $display .= COM_siteFooter();
              echo $display;
    $display .= "Hello World";
    // do some other stuff here
    $display .= COM_siteFooter();
    echo $display;

    The big difference in this version of the program is that right at the top of the program we test for group permissions, and if the users does not have them we display the site footer, then exit. So a user not in the 'geeker' group will end right there and never see what the rest of the program does. Very simple, but very powerful! This is precisely how you control access to you pages in Geeklog!

    Where to put it

    If you are only writing a small program, then sticking a single file in the public_html directory as shown above will work fine. As soon as you get to the point, however, when you start having your own include files and so on, you probably want to create a directory for it. In our case we could create a directory in "public_html" called "hello", and then create a file "index.php" with the above program. This will require a very minor change to the original program - see if you can pick it out before peeking :

    require_once( '../lib-common.php' );
    $display =  COM_siteHeader();
    $display .= "Hello World";
    $display .= COM_siteFooter();
    echo $display;

    Yup, that's right, we had to add "../" to the "lib-common.php" in the "require_once" (which BTW is a type of "include" in PHP). The reason is simple : lib-common.php lives in public_html, and our first program was in that directory as well. This new program is in a subdirectory of public_html, so we have to go to the parent directory to get our include file.

    If you want to keep your geeklog installation "pure", as I usually do, you can also put your program directory somewhere outside of the geeklog directory, and use directives for your webserver to map that directory into the web space of your geeklog installation. That's easier than it sounds - with Apache just use the "Alias" directive in your apache config file, like this :

    Alias /hello/ "/path/to/your/hello/"

    Of course, this means that your require_once statement will have to contain the full path to lib-common.php

    require_once( '/path/to/geeklog/public_html/lib-common.php' );

    To Plug it in, or not

    This is a bit of an advanced topic which in some ways is out of place at this point, but just about everyone who knows Geeklog and has used it a bit, knows about [[Geeklog plugins. And when writing your own Geeklog programs, this will obviously be something in your mind. Not all Geeklog programs are plugins - and the above examples are not. Plugins involve writing your program in a specific way, and defining specific functions which Geeklog will expect to find. It also involves making some entries in the Geeklog database to let Geeklog know that your plugin is there.

    In general if you want to use the Geeklog comment engine, the Geeklog search engine (i.e. integrate your program data into the search feature of Geeklog), or the Geeklog submission engine, you must write a plugin. Otherwise you can just write code. Size doesn't matter. There is no limit after which you have to make it a plugin.

    Some Odds and Ends

    A couple of more quick points on some basic Geeklog stuff

  • the $_USER array comes pre-populated for you by Geeklog. If $_USER['uid'] is greater than 1, then you know your user is logged on. Otherwise they are anonymous. So in the above example if you wanted to test for "logged on user" rather than "member of geeker group", just change the 'if' statement accordingly. This array contains all of the user table from geeklog, the next most useful subscript being $_USER['username']
  • the $_CONF array contains everything you set in your config.php, if you need it. Just check config.php for what all is there.
  • both of the above arrays are global, and as such if you use them in a function you must declare them in the function with the 'global' directive, as is normal for PHP. Outside of any function in the main body of the program they can be just used.

    Functions, Bring Me Functions!

    We've already seen two of the most widely used functions that Geeklog has to offer - COM_siteHeader() and COM_siteFooter(). It is important to note with this that there are optional parameters you can pass to each of them to achieve certain results. COM_siteHeader() displays the header and the left blocks, while it's partner controls the footer and the right blocks. By default COM_siteHeader() displays the left blocks, and by default COM_siteFooter() does not display the right blocks. Check the source code in lib-common.php for details on how to change this behavior.

    Another set of similar workhorse functions which are also defined in lib-common.php along with the aforementioned functions are COM_startBlock() and COM_endBlock(). COM_startBlock() accepts 3 optional parameters : title, helpfile and template. The most useful and almost always used is title, which is a text string which will appear in the title bar of the block. If a helpfile is specified, Geeklog will display the help question mark icon and link to a help file for that block. And by default the 'blockheader.thtml' template is used unless another is specified. COM_endBlock() must be called once for each call to COM_startBlock(), and it's only optional parameter is template, the default being blockfooter.thtml.

    Blocks can be nested inside of each other, which is obvious by simply looking at just about any geeklog website.

    require_once( 'lib-common.php' );
    $display =  COM_siteHeader();
    $display .= COM_startBlock("Outer Block")
                 . "This text should be inside the outer block but outside the inner block"
                 . COM_startBlock("Inner Block")
                 . "This text should be inside the inner block"
                 . COM_endBlock()
                 . COM_endBlock();
    $display .= COM_siteFooter();
    echo $display;

    When using nested blocks inside of HTML tables, one simply has to be certain to call COM_endBlock() in the right place since these functions output HTML tables as well, and otherwise the display may not render properly.

    require_once( 'lib-common.php' );
    $display =  COM_siteHeader();
    $display .= COM_startBlock("Outer Block")
                 . "This text should be inside the outer block but outside the inner blocks"
                 . "<table align=center width=100% border=0>"
                 . "<tr><td align=center width=50%>"
                 . COM_startBlock("Left Inner Block")
                 . "This text should be inside the left inner block"
                 . COM_endBlock()
                 . "</td>"
                 . "<td align=center width=50%>"
                 . COM_startBlock("Left Inner Block")
                 . "This text should be inside the right inner block"
                 . COM_endBlock()
                  . "</td></tr></table>"
                 . "This text should be below the inner blocks but inside the outer block"
                 . COM_endBlock();
    $display .= COM_siteFooter();
    echo $display;

    The great advantage of using these two functions is that whenever the site admin or user changes their Geeklog theme, your GUI will change to match. Your program will always retain the same look-and-feel of the site in general.

    There are also some useful HTML form functions found in lib-common.php which come in very handy and make life a bit easier. COM_optionList( $table, $selection, $selected=, $sortcol=1 ). This creates an HTML "<option" list generated from the given table, using the passed variable "$selected" in the SELECT statement of the HTML query. See source code for a better idea of what the function does, but it is very useful.

    In a similar vein, COM_checkList( $table, $selection, $where=, $selected= ) creates a list of check boxes from the given table, with the given select and where clauses being passed to the SQL statement inside the function.

    One more useful function is the COM_errorLog($logentry, $actionid = ) function which logs to the Geeklog logfile if $actionid is 1, or to the screen if it is set to 2.

    COM_checkWords( $Message ) gives you access to Geeklog's (somewhat rudementary) profanity filter. We find it to be not terribly useful since if you include for example the word "cock" in your filter, you will also filter out the completely innocuous word "peacock". If you nonetheless want to use the geeklog profanity filter, simply do this :

    $text = COM_checkWords( $text )

    COM_mail( $to, $subject, $message, $from = , $html = false, $priority = 0 ) does exactly what the name suggests and lets you send mail to someone.

    THere are far too many functions in lib-common.php to discuss here, so we'll end off with two very important ones which can be used for accessing query-string variables. What's a query string? If you have a URL like this :


    The query string is the part after the question mark - the stuff you pass into your program. In this example, inside the text of someprogram.php, if the PHP installation has "register_globals" turned on, the variable "$variable" will automagically exist in the program and will have the value "value". But there are certain security problems with using "register_globals" in PHP so a lot of people do not like to have it turned on. Unfortunately Geeklog requires that it be turned on (at least for now until the programmers get it rewritten to eliminate the need), so to mitigate the risks involved you can use special functions to obtain your query string variables.

    Near the top of your program simply insert something like the following, first to define which are the only global variables your program expects to see, then finally to safely obtain the value of those variables :

    $variable               = COM_getArgument('variable');
    $othervariable       = COM_getArgument('othervariable');

    Using the Database

    Geeklog has a database abstraction layer which in theory makes it possible for you to use any database as the backend for it. Though in practice the Geeklog team has only implemented a backend for the popular MySQL database. In any case, when programming Geeklog you do not use the regular PHP database functions - instead you use the DB_ functions which behave almost idenically to the PHP functions that have similar names.

    Another important thing to note about Geeklog is that you should never use table names directly in your queries. Instead, you should use the $_TABLES global variable, and add your own table names to it if you make your own tables. The reason for this is simply that Geeklog allows the installer to specify a "table prefix", so if you use table names directly your code will not run on another Geeklog installation that uses a different table prefix. Even if you think you'll never want to run your code on another Geeklog installation, we recommend you do things properly because you never do know. I've written code that I thought would never have to run in another installation, and sure enough 2 years later I have to go back and convert it all to use the $_TABLES array because now I do indeed want to run it on another installation that is using a different table prefix.

    One final very important thing to state about using the Geeklog database is that under no circumstances whatsoever should you ever alter the default Geeklog tables. One example of where you might be tempted to do this is if you want to track a specific option for users - you may be tempted to add a field or two to the Geeklog "users" table. Say for example you are writing a program "buysell" which allows users to enter items into the database to put them up for sale to other users. And when browsing the database to see what is for sale, you want each user to decide whether or not they want to see their own items. You may be tempted to add a boolean field "seeown" to the Geeklog users table, but don't do it! Instead, create your own table "buysell_userprefs" and add whatever fields you require to this new table. At very least we need a field for the userid - so we'll call it "bsp_uid", and we need a field for "see your own items" so we'll call it "bsp_seeown".

    In general we like to give table fields names that have an abbreviation of the table name at the beginning of every field. So in our case this is a table which contains "buy sell preferences" for each user, so we'll name all the fields "bsp_". This is optional, but we've found it to be a good practice so that you do not end up with fields from various tables with the same name - something that can under circumstances cause problems in your queries, or unexpected results.

    Adding to $_TABLES

    As already mentioned, if you define your own tables, you have to add them to the global $_TABLES variable.

    $_TABLES['buysell_userprefs']  = $_DB_table_prefix . 'buysell_userprefs';

    Note that we've included the Geeklog global variable for table prefix, so that our code will work in all Geeklog installations. And of course you need one line for every table you are adding to the Geeklog database. And finally, like any global variable in Geelog you must declare it global in a function if you want to use it in that function.

    When doing a plugin you usually put this into the config.php for your plugin. If not doing a plugin you have several options on where to put it, depending upon how you have your code organised. If you have one big file, then put it at the top of that file. If you have an include file that gets included by all the programs you are writing, put it there. Basically you have to put it whereever you can that will ensure it gets executed by all of your programs and is visible by all of your programs.

    Get on with it!

    And finally we can show you how to put it all together. Let's write a simple little program that does nothing more than show you what your 'bsp_seeown' preference is set to.

    $display =  COM_siteHeader(); 
    if ( $_USER['uid'] < 2 ) {
               $display .= "You are not logged in";
               $display .= COM_siteFooter();
               echo $display;
    $_TABLES['buysell_userprefs']  = $_DB_table_prefix . 'buysell_userprefs';
    $sql = "SELECT bsp_seeown FROM {$_TABLES['buysell_userprefs']} "
            . " WHERE {$_TABLES['buysell_userprefs']}.bsp_uid = {$_USER['uid']} ";
    $result = DB_query( $sql );
    if ( ! $result ) {
              // some error condition and possibly exit
    if ( DB_numRows( $result ) <> 1 ) {
             // there should be precisely one entry for each user
             // otherwise you may want to flag an error condition
             // or you may want to alternately check to see if this
             // value is less than 1 first, in which case they user
             // has not yet set their preferences
    $bsp = DB_fetchArray( $result );
    if ( ! $bsp ) {
            // some error condition
    $display .= COM_startBlock("Your Preference is") 
                 . $bsp['bsp_seeown']
                 . COM_endBlock(); 
    $display .= COM_siteFooter(); 
    echo $display; 

    Wow! THere's lots going on in this program! A lot more than what we might have expected! First and foremost note that there are lots of potential error conditions to check for, when using the Geeklog database. This is no different from just programming MySQL with the normal PHP functions, actually. It is always a best practice to check for error conditions and react accordingly.

    Before we looked up the user's preference, we of course first did a check to make sure they were logged on, and if not we exited. Then, you can see how we added our table to the $_TABLES global variable, and then inside of the SELECT statement used the $_TABLES variable to ensure our code is portable. If you wanted to move this to another system you do not have to change a thing!

    As for the specific DB_ functions we used, they behave in the same way as the PHP MySQL functions with similar names. If you aren't familiar with how they work, check the Geeklog source code as well as the PHP manual. For a full listing of all the DB_ functions available to you, check out /path/to/geeklog/system/lib-database.php

    Defining Functions

    Defining functions in Geeklog is of course no different from doing so in PHP. Though there are a few lessons to be learned from the Geeklog coding style. One handy thing to do is pick a 3 to 5 character prefix for all of your functions. This will help prevent you and some other developer from walking on each others toes and writing plugins or other Geeklog programs which are incompatible with each other. For example in my User Pages Plugin I chose the prefix "UPAGE_" for everyone one of my own functions.

    Figuring out how to do return codes from functions is never easy in Geeklog or PHP in general. Many functions will return strings of HTML formatted text, and so returning error conditions is not easy. There is no one solution for every circumstance - though I've found 2 solutions work most of the time. If you hit an error condition in your function you can either return a NULL string so the caller can check for NULL string, or you can just return a string with an error message about the problem encountered, in which case the caller will not really know something went wrong - which may or may not matter. It depends on your caller.

    Let's have a look at a couple of functions for making HTML select boxes out of the database. The first function is essentially the same as the Geeklog function COM_optionList although it does get called with different parameters, and the Geeklog function is a bit more powerful.

    One thing you will see first off in the below function definition is that PHP gives you a means to specify default values for function parameters. This means that when calling the function, only the first two parameters "myName" and "myOptions" need be specified. myName is the name this element will have (variable name) and myOptions is a list of options separated by the "mySep" character which by default is "|".

    An important aspect to understand about default values for parameters is that you can only allow the X right-most parameters to have a default value. That is to say you cannot specify a default value for the 1st parameter, then none for the 2nd, then one for the 3rd and so on. The first zero or more parameters will have no default, then after the first one that has a default value all the rest must also have default values. And also when calling the function that we have below, if I wanted to override the default for "mySep" for example by passing a value in, then I also have to override the defaults for every parameter to the left of it - so I must also specify overrides for "myDefault", "myMulti" and "mySize".

    So I could call the function in any of the following ways :

    $display   .= SSM_inputSelect( "SelectBox", "one|two|three" );
    $display   .= SSM_inputSelect( "SelectBox", "one|two|three", "one" );
    $display   .= SSM_inputSelect( "SelectBox", "one|two|three", "one", 0 );
    $display   .= SSM_inputSelect( "SelectBox", "one|two|three", "one", 0, 1 );
    $display   .= SSM_inputSelect( "SelectBox", "one:two:three", "one", 0, 1, ":" );

    and so on. BUt I could not do this if all I wanted to specify was "mySep" :

    $display   .= SSM_inputSelect( "SelectBox", "one:two:three", ,,, ":" );

    So the moral of the story is that if you are having parameters with default values you have to give some consideration to the order of the arguments. You want the ones least likey to be overridden to be the right-most, and the ones most likely to be overridden to be left-most.

    function SSM_inputSelect( $myName, $myOptions, $myDefault="", $myMulti=0,
                                    $mySize=1, $mySep="|", $visible=true )
            $retval .= ""
            . "<SELECT size=\"" . $mySize . "\" name=\"" . $myName . "\"";
            $retval .= ($myMulti == 0) ? ">" : " multiple>";
            $arrayOptions = explode($mySep,$myOptions);
            foreach ($arrayOptions as $oneOption) {
                    $oneOption = trim($oneOption);
                    if ( $myMulti == 0 )
                            if ( $oneOption == $myDefault )
                                    $retval .= "<OPTION SELECTED>" . $oneOption . "</OPTION>";
                                    $retval .= "<OPTION>" . $oneOption . "</OPTION>";
                            if ( in_array( $oneOption, $myDefault ))
                                    $retval .= "<OPTION SELECTED>" . $oneOption . "</OPTION>";
                                    $retval .= "<OPTION>" . $oneOption . "</OPTION>";
            $retval .= ""
            . "</SELECT>"
            . "";
            return $retval;

    Now let's have a look at another function which builds on the above by allowing us to pull stuff out of the database and present it in an options list.

    function SSM_inputSelectDBField( $myName, $myTable, $myField, $myDefault="",
                                    $mySize=1, $myMulti=0, $extra="", $mySep="|" )
            // select distinct entries from the given field of given table
            $sql    = "SELECT DISTINCT " . $myField . " FROM " . $myTable
                    . " ORDER BY " . $myField;
            // allows us to add an extra entry that was not in the DB
            if ( $extra != "" )
                    $myOpts = $extra . $myOpts;
            $result = DB_query($sql);
            // format the data as required by SSM_inputSelect()
            while ( $R = DB_fetchArray( $result ) )
                    if ( $myOpts == "" )
                            $myOpts .= $R[$myField];
                            $myOpts .= $mySep . $R[$myField];
            // now call the guy doing the actual work
            $retstr .= SSM_inputSelect( $myName, $myOpts, $myDefault, $myMulti,
                                    $mySize, $mySep );
            return $retstr;

    And finally here is a similar function which once again builds upon "SSM_inputSelect" but this time it takes an field of type ENUM and builds a SELECT box out of all the possible preset values of the ENUM.

    // Does not yet allow multi select but should be rewritten to do this
    function SSM_inputEnumDBField( $myName, $myTable, $myField, $myDefault="", $visible=true )
            // query the DB to extract the enum values
            $qqq    = "DESCRIBE $myTable $myField";
            $result = DB_query( $qqq );
            $arow   = DB_fetchArray( $result );
            $myArr  = explode( ",", trim( strstr( $arow['Type'], "(" ), "()")) ;
            // now format the values as required by SSM_inputSelect()
            $cnt    = count($myArr);
                    $myArr[$idx]    = trim( $myArr[$idx], "'" );
            sort( $myArr );
            $myList         = implode( "|", $myArr );
            // now call our workhorse
            return SSM_inputSelect( $myName, $myList, $myDefault );

    The lesson here is that your functions should be well-defined and reusable. Here we could have written 2 different functions which have nothing to do with each other, but instead we wrote a 3rd base function first which the other 2 rely on to get the job done. Now if there is some substantial change in how I want the SELECT boxes drawn, I only have to make the change in one place.

    Support and Such

    The best place for Geeklog support is of course the main Geeklog site. But there are a few other great places to check including Squatty and Portal Parts. Squatty and Blaine are hard-core Geeklog developers and are responsible for several popular themes, plugins and hacks.

    If you want to report a bug or request a feature, set yourself up an account here and do so. If they don't know it is broken, the cannot fix it. I've reported several bugs and have had them fixed prompty. I've also tracked down and fixed several bugs and simply submitted the code which was accepted. And I've also requested several features which have been added over the years at my request. The Geeklog development team is small, but very dedicated and they love to get feedback from the user base.