我已经编写了一个与我一起使用的自定义助行器wp_nav_menu 但我需要遍历4个自定义类，我不知道如何做到这一点。基本上，每个菜单项<li> 需要给一类color1, color2, color3 或color4, 循环返回到color1, 泡沫，冲洗，重复，按顺序。
通常我会用$i 和a$i++, 但是在沃克的课堂上我该怎么做呢？
编辑：我的Walker课程代码：
class Salamander_Advent_Walker extends Walker_page {
function start_el(&$output, $item, $depth, $args) {
if ( $depth ) {
$indent = str_repeat("\\t", $depth);
} else {
$indent = \'\';
}
$advent_thumbnail = get_post_meta($item->ID, \'advent-thumb\', true);
$advent_slug = get_post_meta($item->ID, \'advent-slug\', true);
$advent_oneliner = get_post_meta($item->ID, \'advent-oneliner\', true);
//$description = get_post_meta($item->ID, \'advent-thumb\', true);
$output .= $indent . \'
<li class="active color4">
<a href="#day\'. $advent_slug .\'">
<span class="day">
<strong>\'. $advent_slug .\'</strong>
<span> </span>
</span>
<span class="content">
<small>\'. $advent_slug .\'</small>
<img src=\'. $advent_thumbnail .\' width="126" height="91" alt="advent" />
<strong>\'. $advent_oneliner .\'</strong>
</span>
</a>\';
}
}
最合适的回答,由SO网友:sirlark 整理而成
使用类变量保持要显示的颜色的“索引”。每次使用它时递增，并检查它是否超过，在这种情况下，将其设置回1。
class Salamander_Advent_Walker extends Walker_page {
private $color_idx = 1;
function start_el(&$output, $item, $depth, $args) {
if ( $depth ) {
$indent = str_repeat("\\t", $depth);
} else {
$indent = \'\';
}
$advent_thumbnail = get_post_meta($item->ID, \'advent-thumb\', true);
$advent_slug = get_post_meta($item->ID, \'advent-slug\', true);
$advent_oneliner = get_post_meta($item->ID, \'advent-oneliner\', true);
//$description = get_post_meta($item->ID, \'advent-thumb\', true);
$output .= $indent . \'
<li class="active color\'.$this->color_idx.\'">
<a href="#day\'. $advent_slug .\'">
<span class="day">
<strong>\'. $advent_slug .\'</strong>
<span> </span>
</span>
<span class="content">
<small>\'. $advent_slug .\'</small>
<img src=\'. $advent_thumbnail .\' width="126" height="91" alt="advent" />
<strong>\'. $advent_oneliner .\'</strong>
</span>
</a>\';
$this->color_idx++;
if ($this->color_idx > 4) {
$this->color_idx = 1
}
}
}
SO网友:Drew Gourley
可以通过将递增的数字设置为全局变量来实现这一点。
function start_el(&$output, $item, $depth, $args) {
//globalize the variable
global $ac_color_num;
//check if it is set, or if it is 4 (to reset to 1)
if ( !isset($ac_color_num) || $ac_color_num == 4 ) { $ac_color_num = 1; }
$ac_color_num++
if ( $depth ) {
$indent = str_repeat("\\t", $depth);
} else {
$indent = \'\';
}
$advent_thumbnail = get_post_meta($item->ID, \'advent-thumb\', true);
$advent_slug = get_post_meta($item->ID, \'advent-slug\', true);
$advent_oneliner = get_post_meta($item->ID, \'advent-oneliner\', true);
//$description = get_post_meta($item->ID, \'advent-thumb\', true);
//use $ac_color_num in the output.
$output .= $indent . \'
<li class="active color\' . $ac_color_num . \'">
<a href="#day\'. $advent_slug .\'">
<span class="day">
<strong>\'. $advent_slug .\'</strong>
<span> </span>
</span>
<span class="content">
<small>\'. $advent_slug .\'</small>
<img src=\'. $advent_thumbnail .\' width="126" height="91" alt="advent" />
<strong>\'. $advent_oneliner .\'</strong>
</span>
</a>\';
}
