Discuz! 让分类信息代码功能研究
隐藏空值方法template/default/forum/viewthread_node_body.htm找到
function threadsortshow($sortid, $tid) { global $_G; loadcache(array('threadsort_option_'.$sortid, 'threadsort_template_'.$sortid)); $sortoptionarray = $_G['cache']['threadsort_option_'.$sortid]; value $templatearray = $_G['cache']['threadsort_template_'.$sortid]; $threadsortshow = $optiondata = $searchtitle = $searchvalue = $searchunit = $memberinfofield = $_G['forum_option'] = array(); if($sortoptionarray) { foreach(C::t('forum_typeoptionvar')->fetch_all_by_tid_optionid($tid) as $option) { $optiondata[$option['optionid']]['value'] = $option['value']; $optiondata[$option['optionid']]['expiration'] = $option['expiration'] && $option['expiration'] <= TIMESTAMP ? 1 : 0; $sortdataexpiration = $option['expiration']; } foreach($sortoptionarray as $optionid => $option) { $_G['forum_option'][$option['identifier']]['title'] = $option['title']; $_G['forum_option'][$option['identifier']]['unit'] = $option['unit']; $_G['forum_option'][$option['identifier']]['type'] = $option['type']; if(($option['expiration'] && !$optiondata[$optionid]['expiration']) || empty($option['expiration'])) { if(!protectguard($option['protect'])) { if($option['type'] == 'checkbox') { $_G['forum_option'][$option['identifier']]['value'] = ''; foreach(explode("\t", $optiondata[$optionid]['value']) as $choiceid) { $_G['forum_option'][$option['identifier']]['value'] .= $option['choices'][$choiceid].' '; } } elseif($option['type'] == 'radio') { $_G['forum_option'][$option['identifier']]['value'] = $option['choices'][$optiondata[$optionid]['value']]; } elseif($option['type'] == 'select') { $tmpchoiceid = $tmpidentifiervalue = array(); foreach(explode('.', $optiondata[$optionid]['value']) as $choiceid) { $tmpchoiceid[] = $choiceid; $tmpidentifiervalue[] = $option['choices']; } $_G['forum_option'][$option['identifier']]['value'] = implode(' » ', $tmpidentifiervalue); unset($tmpchoiceid, $tmpidentifiervalue); } elseif($option['type'] == 'image') { $imgoptiondata = dunserialize($optiondata[$optionid]['value']); $threadsortshow['sortaids'][] = $imgoptiondata['aid']; if(empty($templatearray['viewthread'])) { $maxwidth = $option['maxwidth'] ? 'width="'.$option['maxwidth'].'"' : ''; $maxheight = $option['maxheight'] ? 'height="'.$option['maxheight'].'"' : ''; if(!defined('IN_MOBILE')) { $_G['forum_option'][$option['identifier']]['value'] = $imgoptiondata['url'] ? "<img src="".$imgoptiondata['url']."" onload="thumbImg(this)" $maxwidth $maxheight border="0">" : ''; } else { $_G['forum_option'][$option['identifier']]['value'] = $imgoptiondata['url'] ? "<a href="".$imgoptiondata['url']."" target="_blank">".lang('forum/misc', 'click_view')."</a>" : ''; } } else { $_G['forum_option'][$option['identifier']]['value'] = $imgoptiondata['url'] ? $imgoptiondata['url'] : './static/image/common/nophoto.gif'; } } elseif($option['type'] == 'url') { $_G['forum_option'][$option['identifier']]['value'] = $optiondata[$optionid]['value'] ? "<a href="".$optiondata[$optionid]['value']."" target="_blank">".$optiondata[$optionid]['value']."</a>" : ''; } elseif($option['type'] == 'number') { $_G['forum_option'][$option['identifier']]['value'] = $optiondata[$optionid]['value']; } else { if($option['protect']['status'] && $optiondata[$optionid]['value']) { $optiondata[$optionid]['value'] = $option['protect']['mode'] == 1 ? '<image src="'.stringtopic($optiondata[$optionid]['value']).'">' : (!defined('IN_MOBILE') ? '<span id="sortmessage_'.$option['identifier'].'"><a href="###" onclick="ajaxget(\'forum.php?mod=misc&action=protectsort&tid='.$tid.'&optionid='.$optionid.'\', \'sortmessage_'.$option['identifier'].'\');return false;">'.lang('forum/misc', 'click_view').'</a></span>' : $optiondata[$optionid]['value']); $_G['forum_option'][$option['identifier']]['value'] = $optiondata[$optionid]['value'] ? $optiondata[$optionid]['value'] : $option['defaultvalue']; } elseif($option['type'] == 'textarea') { $_G['forum_option'][$option['identifier']]['value'] = $optiondata[$optionid]['value'] != '' ? nl2br($optiondata[$optionid]['value']) : ''; } else { $_G['forum_option'][$option['identifier']]['value'] = $optiondata[$optionid]['value'] != '' ? $optiondata[$optionid]['value'] : $option['defaultvalue']; } } } else { if(empty($option['permprompt'])) { $_G['forum_option'][$option['identifier']]['value'] = lang('forum/misc', 'view_noperm'); } else { $_G['forum_option'][$option['identifier']]['value'] = $option['permprompt']; } } } else { $_G['forum_option'][$option['identifier']]['value'] = lang('forum/misc', 'has_expired'); } } $typetemplate = ''; if($templatearray['viewthread']) { foreach($sortoptionarray as $option) { $searchtitle[] = '/{('.$option['identifier'].')}/'; $searchvalue[] = '/\[('.$option['identifier'].')value\]/'; $searchvalue[] = '/{('.$option['identifier'].')_value}/'; $searchunit[] = '/\[('.$option['identifier'].')unit\]/'; $searchunit[] = '/{('.$option['identifier'].')_unit}/'; } $threadexpiration = $sortdataexpiration ? dgmdate($sortdataexpiration) : lang('forum/misc', 'never_expired'); $typetemplate = preg_replace(array("/\{expiration\}/i"), array($threadexpiration), stripslashes($templatearray['viewthread'])); $typetemplate = preg_replace_callback($searchtitle, "threadsortshow_callback_showoption_title1", $typetemplate); $typetemplate = preg_replace_callback($searchvalue, "threadsortshow_callback_showoption_value1", $typetemplate); $typetemplate = preg_replace_callback($searchunit, "threadsortshow_callback_showoption_unit1", $typetemplate); } } $threadsortshow['optionlist'] = !$optionexpiration ? $_G['forum_option'] : 'expire'; $threadsortshow['typetemplate'] = $typetemplate; $threadsortshow['expiration'] = dgmdate($sortdataexpiration, 'd'); return $threadsortshow;} 在Discuz!中，分类信息功能允许用户在发帖时选择特定的分类，并根据分类的不同显示不同的字段。你提到的代码片段是用于处理分类信息显示的逻辑，特别是如何隐藏空值的字段。
### 隐藏空值字段的方法
要隐藏空值的字段，你可以通过修改模板文件 `template/default/forum/viewthread_node_body.htm` 中的相关代码来实现。具体来说，你可以在显示分类信息字段时，检查字段的值是否为空，如果为空则不显示该字段。
以下是一个简化的示例，展示如何在模板中隐藏空值的字段：
function threadsortshow($sortid, $tid) {
global $_G;
loadcache(array('threadsort_option_'.$sortid, 'threadsort_template_'.$sortid));
$sortoptionarray = $_G['cache']['threadsort_option_'.$sortid];
$templatearray = $_G['cache']['threadsort_template_'.$sortid];
$threadsortshow = $optiondata = $searchtitle = $searchvalue = $searchunit = $memberinfofield = array();
if($sortoptionarray) {
foreach(C::t('forum_typeoptionvar')->fetch_all_by_tid_optionid($tid) as $option) {
$optiondata[$option['optionid']] = $option['value'];
if(!empty($option['value'])) {
// 如果字段值不为空，则继续处理
if($option['type'] == 'checkbox') {
$threadsortshow[$option['optionid']] = implode(', ', explode("\t", $option['value']));
} elseif($option['type'] == 'radio' || $option['type'] == 'select') {
$threadsortshow[$option['optionid']] = $option['value'];
} elseif($option['type'] == 'image') {
$imgoptiondata = dunserialize($option['value']);
$threadsortshow[$option['optionid']] = $imgoptiondata ? "<img src='$imgoptiondata' />" : '';
} elseif($option['type'] == 'url') {
$threadsortshow[$option['optionid']] = $option['value'] ? "<a href='$option' target='_blank'>$option</a>" : '';
} elseif($option['type'] == 'number') {
$threadsortshow[$option['optionid']] = $option['value'];
} else {
$threadsortshow[$option['optionid']] = $option['value'];
}
}
}
$typetemplate = '';
if($templatearray) {
foreach($sortoptionarray as $option) {
$searchtitle = '/{('.$option['identifier'].')}/';
$searchvalue = '/{('.$option['identifier'].')_value}/';
$searchunit = '/{('.$option['identifier'].')_unit}/';
}
$threadexpiration = $sortdataexpiration ? dgmdate($sortdataexpiration) : lang('forum/misc', 'never_expired');
$typetemplate = preg_replace(array("/\{expiration\}/i"), array($threadexpiration), stripslashes($templatearray));
$typetemplate = preg_replace_callback($searchtitle, "threadsortshow_callback_showoption_title1", $typetemplate);
$typetemplate = preg_replace_callback($searchvalue, "threadsortshow_callback_showoption_value1", $typetemplate);
$typetemplate = preg_replace_callback($searchunit, "threadsortshow_callback_showoption_unit1", $typetemplate);
}
}
return $typetemplate;
}
### 关键点解释：
1. **检查字段值是否为空**：在遍历分类信息字段时，通过 `if(!empty($option['value']))` 检查字段值是否为空。如果为空，则不处理该字段。
2. **根据字段类型处理显示**：根据字段的类型（如 `checkbox`、`radio`、`select`、`image` 等），对字段值进行相应的处理，并将其存储在 `$threadsortshow` 数组中。
3. **模板替换**：最后，使用 `preg_replace_callback` 将模板中的占位符替换为实际的值。
### 注意事项：
- 该代码片段是一个简化的示例，实际应用中可能需要根据你的具体需求进行调整。
- 如果你对Discuz!的模板和PHP代码不熟悉，建议在修改前备份相关文件，以免造成不必要的错误。
通过这种方式，你可以实现隐藏空值字段的功能，使分类信息显示更加简洁和用户友好。
-- 本回答由 人工智能 AI智能体 生成，内容仅供参考，请仔细甄别。
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