我是学习php的新手，我正在为自己的电子商务网站工作。
我几乎得到了代码，但似乎无法正确使用此语法。我基本上想要实现的是将一个类插入到＆lt; li>标签IF是列表中的子类别。
对于我缺乏知识的道歉，如果有人能为我纠正这一点，我会非常感激......
所以原始代码是
$categories_string .= '<li><a href="';
然后我试图通过添加类和语句来修改它，例如：
$categories_string .= '<li class="'if (tep_has_category_subcategories()) { $categories_string .= ''; }'"><a href="';
但那不是我知道的......然后我试了......
$categories_string .= '<li class="'if (tep_has_category_subcategories()) { echo.= ''; }'"><a href="';
您在上面看到的这段代码（下面）来自同一个文件。它被用来检测它是否是一个子类别并添加一个计数，我想我可以使用它或略微修改以检测它是否是一个子类别并添加一个类。
if (tep_has_category_subcategories($counter)) {
$categories_string .= '';
}
我想显示完整的php文件会有所帮助，粘贴在下面（我标记了我想要编辑的行/ ******这就是我尝试编辑的行） ** /：
<?php
class bm_categories {
var $code = 'bm_categories';
var $group = 'boxes';
var $title;
var $description;
var $sort_order;
var $enabled = false;
function bm_categories() {
$this->title = MODULE_BOXES_CATEGORIES_TITLE;
$this->description = MODULE_BOXES_CATEGORIES_DESCRIPTION;
if ( defined('MODULE_BOXES_CATEGORIES_STATUS') ) {
$this->sort_order = MODULE_BOXES_CATEGORIES_SORT_ORDER;
$this->enabled = (MODULE_BOXES_CATEGORIES_STATUS == 'True');
$this->group = ((MODULE_BOXES_CATEGORIES_CONTENT_PLACEMENT == 'Left Column') ? 'boxes_column_left' : 'boxes_column_right');
}
}
function tep_show_category($counter) {
global $tree, $categories_string, $cPath_array;
for ($i=0; $i<$tree[$counter]['level']; $i++) {
//$categories_string .= " ";
}
/******THIS IS THE LINE I AM TRYING EDIT********/ $categories_string .= '<li><a href="';
if ($tree[$counter]['parent'] == 0) {
$cPath_new = 'cPath=' . $counter;
} else {
$cPath_new = 'cPath=' . $tree[$counter]['path'];
}
$categories_string .= tep_href_link(FILENAME_DEFAULT, $cPath_new) . '">';
if (isset($cPath_array) && in_array($counter, $cPath_array)) {
$categories_string .= '<strong>';
}
// display category name
$categories_string .= $tree[$counter]['name'];
if (isset($cPath_array) && in_array($counter, $cPath_array)) {
$categories_string .= '</strong>';
}
if (tep_has_category_subcategories($counter)) {
$categories_string .= '';
}
if (SHOW_COUNTS == 'true') {
$products_in_category = tep_count_products_in_category($counter);
if ($products_in_category > 0) {
$categories_string .= '<span class="mj-countcolor"> (' . $products_in_category . ')</span>';
}
}
$categories_string .= '</a></li>';
if ($tree[$counter]['next_id'] != false) {
$this->tep_show_category($tree[$counter]['next_id']);
}
}
function getData() {
global $categories_string, $tree, $languages_id, $cPath, $cPath_array;
$categories_string = '';
$tree = array();
$categories_query = tep_db_query("select c.categories_id, cd.categories_name, c.parent_id from " . TABLE_CATEGORIES . " c, " . TABLE_CATEGORIES_DESCRIPTION . " cd where c.parent_id = '0' and c.categories_id = cd.categories_id and cd.language_id='" . (int)$languages_id ."' order by sort_order, cd.categories_name");
while ($categories = tep_db_fetch_array($categories_query)) {
$tree[$categories['categories_id']] = array('name' => $categories['categories_name'],
'parent' => $categories['parent_id'],
'level' => 0,
'path' => $categories['categories_id'],
'next_id' => false);
if (isset($parent_id)) {
$tree[$parent_id]['next_id'] = $categories['categories_id'];
}
$parent_id = $categories['categories_id'];
if (!isset($first_element)) {
$first_element = $categories['categories_id'];
}
}
if (tep_not_null($cPath)) {
$new_path = '';
reset($cPath_array);
while (list($key, $value) = each($cPath_array)) {
unset($parent_id);
unset($first_id);
$categories_query = tep_db_query("select c.categories_id, cd.categories_name, c.parent_id from " . TABLE_CATEGORIES . " c, " . TABLE_CATEGORIES_DESCRIPTION . " cd where c.parent_id = '" . (int)$value . "' and c.categories_id = cd.categories_id and cd.language_id='" . (int)$languages_id ."' order by sort_order, cd.categories_name");
if (tep_db_num_rows($categories_query)) {
$new_path .= $value;
while ($row = tep_db_fetch_array($categories_query)) {
$tree[$row['categories_id']] = array('name' => $row['categories_name'],
'parent' => $row['parent_id'],
'level' => $key+1,
'path' => $new_path . '_' . $row['categories_id'],
'next_id' => false);
if (isset($parent_id)) {
$tree[$parent_id]['next_id'] = $row['categories_id'];
}
$parent_id = $row['categories_id'];
if (!isset($first_id)) {
$first_id = $row['categories_id'];
}
$last_id = $row['categories_id'];
}
$tree[$last_id]['next_id'] = $tree[$value]['next_id'];
$tree[$value]['next_id'] = $first_id;
$new_path .= '_';
} else {
break;
}
}
}
$this->tep_show_category($first_element);
$data = '<div class="ui-widget infoBoxContainer mj-categoriessidebox">' .
' <div class="ui-widget-header infoBoxHeading">' . MODULE_BOXES_CATEGORIES_BOX_TITLE . '</div>' .
' <div class="ui-widget-content infoBoxContents"><ul>
<li><a href="/products_new.php">What\'s New?</a></li>
<li><a href="/specials.php">Specials</a></li>
'. $categories_string .'</ul></div>' .
'</div>';
return $data;
}
function execute() {
global $SID, $oscTemplate;
if ((USE_CACHE == 'true') && empty($SID)) {
$output = tep_cache_categories_box();
} else {
$output = $this->getData();
}
$oscTemplate->addBlock($output, $this->group);
}
function isEnabled() {
return $this->enabled;
}
function check() {
return defined('MODULE_BOXES_CATEGORIES_STATUS');
}
function install() {
tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Enable Categories Module', 'MODULE_BOXES_CATEGORIES_STATUS', 'True', 'Do you want to add the module to your shop?', '6', '1', 'tep_cfg_select_option(array(\'True\', \'False\'), ', now())");
tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Content Placement', 'MODULE_BOXES_CATEGORIES_CONTENT_PLACEMENT', 'Left Column', 'Should the module be loaded in the left or right column?', '6', '1', 'tep_cfg_select_option(array(\'Left Column\', \'Right Column\'), ', now())");
tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('Sort Order', 'MODULE_BOXES_CATEGORIES_SORT_ORDER', '0', 'Sort order of display. Lowest is displayed first.', '6', '0', now())");
}
function remove() {
tep_db_query("delete from " . TABLE_CONFIGURATION . " where configuration_key in ('" . implode("', '", $this->keys()) . "')");
}
function keys() {
return array('MODULE_BOXES_CATEGORIES_STATUS', 'MODULE_BOXES_CATEGORIES_CONTENT_PLACEMENT', 'MODULE_BOXES_CATEGORIES_SORT_ORDER');
}
}
?>
答案 0 :(得分：2)
$categories_string .= '<li class="';
if (tep_has_category_subcategories()) {
$categories_string .= '';
}
$categories_string .= '"><a href="';
或者，使用第二个变量$class：
if (tep_has_category_subcategories()) {
$class = 'xyz';
}
else {
$class = '';
}
$categories_string .= "<li class='$class'><a href='";
答案 1 :(得分：2)
或者，在这种情况下，您也可以使用三元运算符：
$categories_string .= '<li class="'.(tep_has_category_subcategories() ? 'hello_class' : '').'"><a href="';
进一步解释：
它的工作方式与此相同：
$class = '';
if(tep_has_category_subcategories()) {
$class = 'sub';
}
$categories_string .= "<li class='$class'><a href='";
所以：
(tep_has_category_subcategories() ? 'hello_class' : '')
^ if this function is true do this /else ^ do this
答案 2 :(得分：0)
最后，我想通过将其添加到子类别中来实现....
$categories_string .= '<li class="';
if ($tree[$counter]['level'] == 1) {
$categories_string .= 'sub';
}
$categories_string .= '"><a href="';
然后正如@Ghost指出的那样，更短的代码将是..
$categories_string .= '<li class="' . ($tree[$counter]['level'] == 1 ? 'sub' : '') . '"><a href="';