前面我们介绍了 WordPress 主题/插件开发 自定义文章分类 筛选功能 图文教程
下面我们记录一下如何在后台实现过滤自定义字段，将以下代码放入 functions.php 文件中代码段如下：
add_filter( 'parse_query', 'jadmin_posts_filter' ); add_action( 'restrict_manage_posts', 'jadmin_posts_filter_restrict_manage_posts' ); function jadmin_posts_filter( $query ) { global $pagenow; if ( is_admin() && $pagenow=='edit.php' && isset($_GET['ADMIN_FILTER_FIELD_NAME']) && '' != $_GET['ADMIN_FILTER_FIELD_NAME']) { $query->query_vars['meta_key'] = sanitize_text_field($_GET['ADMIN_FILTER_FIELD_NAME']); if (isset($_GET['ADMIN_FILTER_FIELD_VALUE']) && '' != $_GET['ADMIN_FILTER_FIELD_VALUE']) $query->query_vars['meta_value'] = sanitize_text_field($_GET['ADMIN_FILTER_FIELD_VALUE']); } } function jadmin_posts_filter_restrict_manage_posts() { global $wpdb; $sql = 'SELECT DISTINCT meta_key FROM '.$wpdb->postmeta.' ORDER BY 1'; $fields = $wpdb->get_results($sql, ARRAY_N); ?> <select name="ADMIN_FILTER_FIELD_NAME"> <option value=""><?php _e('Filter By Custom Fields', 'jiloc'); ?></option> <?php $current = isset($_GET['ADMIN_FILTER_FIELD_NAME'])? $_GET['ADMIN_FILTER_FIELD_NAME']:''; $current_v = isset($_GET['ADMIN_FILTER_FIELD_VALUE'])? $_GET['ADMIN_FILTER_FIELD_VALUE']:''; foreach ($fields as $field) { if (substr($field[0],0,1) != "_"){ printf ( '<option value="%s"%s>%s</option>', $field[0], $field[0] == $current? ' selected="selected"':'', $field[0] ); } } ?> </select> <?php _e('Value:', 'jiloc'); ?><input type="TEXT" name="ADMIN_FILTER_FIELD_VALUE" value="<?php echo $current_v; ?>" /> <?php }
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