How to add configuration options to Discuz! Forum
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Discuz! Forum has many configuration options in the background, and many functions can be achieved through these configuration options. During the secondary development of the Discuz! forum, we also need to frequently add some configurations and then perform different operations based on the configurations. Next, I will introduce how to add configuration options in the Discuz! forum. Let’s take Discuz! 6.0 as an example. First, let's take a look at the configuration interface of the Discuz! forum backend. Log in to the forum backend as an administrator, select 'Basic Settings' -> 'Basic Settings' and the following interface will appear:  Figure 1 This page uses a frame. We right-click on the page in the lower right corner and select 'Properties'. In the pop-up window, we find that the URL of this page is '/admincp.php?action=settings&do=basic'. The program used by this page is admincp.php. Let's analyze this file first. The contents of lines 172-290 of this file are as follows: The code is as follows: $cpscript = ''; if($adminid == 1) { if($action == 'home') { $cpscript = 'home'; } elseif($action == 'runwizard' && isfounder()) { $cpscript = 'runwizard'; } elseif … } elseif($adminid == 2 || $adminid == 3) { if($action == 'home') { $cpscript = 'home'; } elseif((($allowedituser || $allowbanuser) && ($action == 'editmember' || $action == 'banmember')) || ($allowbanip && $action == 'ipban')) { $cpscript = 'members'; } elseif…… } if($cpscript) { } elseif…… } if($cpscript) { require_once DISCUZ_ROOT.'./admin/'.$cpscript.'.inc.php'; } … This program mainly assigns a value to $cpscript based on the $action variable, and then imports the program file in the admin directory based on the value of $cpscript. If we pay attention to the judgment of the $action value on the left side of line 179, we will find that the value of $cpscript is 'settings', which means that the program file introduced in line 283 is 'admin/settings.inc.php'. Then open the settings.inc.php file and you will find that the content is very long. Don’t be scared by it, just analyze it carefully. Line 14: The code is as follows: $operation = $operation ? $operation : (!empty($do) ? $do : ''); Here, $operation will be assigned a value based on the $do value received from GET. In this example, its value is 'basic'. Line 17: The code is as follows: $query = $db->query("SELECT * FROM {$tablepre}settings"); while($setting = $db->fetch_array($query)) { $settings[$setting['variable']] = $setting['value']; } These program segments read data from the database and store it in the array $settings for subsequent calls. The following program structure is as follows: The code is as follows: if(!submitcheck('settingsubmit')) { if($operation == 'access') { … } elseif($operation == 'styles') { … } elseif … } else { //Data processing after form submission … } The submitcheck function in the program is used to check whether a form is submitted. If the form is not submitted, the form is displayed according to the $operation processed previously. Here, the value of $operation is basic, which executes the following: The code is as follows: $operation = 'basic'; showtype('settings_general', 'top'); showsetting('settings_bbname', 'settingsnew[bbname]', $settings['bbname'], 'text'); showsetting('settings_sitename', 'settingsnew[sitename]', $settings['sitename'], 'text'); showsetting('settings_siteurl', 'settingsnew[siteurl]', $settings['siteurl'], 'text'); showsetting('settings_index_name', 'settingsnew[indexname]', $settings['indexname'], 'text'); showsetting('settings_icp', 'settingsnew[icp]', $settings['icp'], 'text'); showsetting('settings_boardlicensed', 'settingsnew[boardlicensed]', $settings['boardlicensed'], 'radio'); showsetting('settings_bbclosed', 'settingsnew[bbclosed]', $settings['bbclosed'], 'radio'); showsetting('settings_closedreason', 'settingsnew[closedreason]', $settings['closedreason'], 'textarea'); A custom function showsetting is used here. Its first parameter is the name of the configuration option. The second parameter is the name value of the input when displayed in HTML. The third parameter is the value of the current configuration option, which is a value in the array $settings found from the database above. The fourth parameter is the type of the input. We add our own configuration option mytest. Add the following code at the end of the above code: The code is as follows: showsetting('settings_mytest', 'settingsnew[mytest]', $settings['mytest'], 'radio'); Save and refresh the page to find an additional option at the bottom of this page: However, if we find that settings_mytest is in English, we can modify the language pack. In the templates/default/admincp.lang.php file, add the following code below line 450 'settings_closedreason_comment' => 'Prompt message that appears when the forum is closed': The code is as follows: 'settings_mytest' => 'Test options:', 'settings_mytest_comment' => 'Prompt message for test options', After saving, refresh the page and you will see Chinese prompts. So far, the display on the interface has been processed. Now let’s talk about how to process the data after the form is submitted. In the /admin/settings.inc.php file, in the if(!submitcheck('settingsubmit')) {} section, the else statement corresponds to the else statement. This part of the code first processes the submitted data and then puts it all into the $settingsnew array, which actually checks the data sent by POST. Around line 1140 of this file there is the following code: The code is as follows: foreach($settingsnew AS $key => $val) { if(isset($settings[$key]) && $settings[$key] != $val) { $$key = $val; $updatecache = TRUE; if(in_array($key, array('newbiespan', 'topicperpage', 'postperpage', 'memberperpage', 'hottopic', 'starthreshold', 'delayviewcount', 'visitedforums', 'maxsigrows', 'timeoffset', 'statscachelife', 'pvfrequence', 'oltimespan', 'seccodestatus', 'maxprice', 'rssttl', 'rewritestatus', 'bdaystatus', 'maxonlines', 'loadctrl', 'floodctrl', 'regctrl', 'regfloodctrl', 'searchctrl', 'extcredits1', 'extcredits2', 'extcredits3', 'extcredits4', 'extcredits5', 'extcredits6', 'extcredits7', 'extcredits8', 'transfermincredits', 'exchangemincredits', 'maxincperthread', 'maxchargespan', 'maxspm', 'maxsearchresults', 'maxsmilies', 'threadmaxpages', 'membermaxpages', 'maxpostsize', 'minpostsize', 'maxavatarsize', 'maxavatarpixel', 'maxpolloptions', 'karmaratelimit', 'losslessdel', 'edittimelimit', 'smcols', 'watermarktrans', 'watermarkquality', 'jscachelife', 'waptpp', 'wapppp', 'wapmps', 'maxmodworksmonths', 'frameon', 'maxonlinelist'))) { $val = (float)$val; } $db->query("REPLACE INTO {$tablepre}settings (variable, value) VALUES ('$key', '$val')"); } } The purpose of this code is to check whether there is a corresponding option in the $settingsnew array. If there is and it is a numeric option, it will be converted to float, and then all will be REPLACE INTO to the data table settings. The mytest option is newly added by us, and there is no such option in the data table. I need to execute the following SQL statement in the database first: REPLACE INTO cdb_settings(variable, value) VALUES('mytest', '0'). Pay attention to modify the table prefix. The mytest options will now be stored in the database. Around line 1160, the code updatecache('settings') will be executed to automatically cache the data in the settingsnew array. Friends who are interested in the specific implementation method can take a closer look at how the /include/cache.func.php file is implemented. After the data is cached, there will be a mytest item in the $_DCACHE['settings'] array in the /forumdata/cache/cache_settings.php file, and then we can use this option to do some operations. Around line 93 of the /include/common.inc.php file, there is the following code: The code is as follows: $cachelost = (@include DISCUZ_ROOT.'./forumdata/cache/cache_settings.php') ? '' : 'settings'; @extract($_DCACHE['settings']); Through the above code, the value of the mytest configuration option is directly stored in the $mytest variable, and we can directly judge $mytest to perform operations. Add the following code to line 17 of the index.php file: The code is as follows: if($mytest) { echo 'Hello This is Test'; } After running, the effect is as follows:  Figure 2 So far, an option has been successfully added to the Discuz! forum. Of course, there are many other options in the forum. The basic idea is the same and you can add them according to the specific situation. |
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