Add custom fields to filter articles in WordPress background

15:13:13, July 8, 2021 WordPress comment eight hundred and nine Reading mode

The WordPress background article list only filters articles by date, category and form by default. Sometimes it is difficult to find articles with a custom field from many articles. You can add the function of filtering articles by user-defined fields in the WordPress background through the following code, which is simple.

Add custom field filtering article function in WordPress background - Picture 1

Add the following code to the current theme function template functions.php:

open shrink

 //Filter articles by custom fields add_filter( 'parse_query', 'zm_posts_filter' ); add_action( 'restrict_manage_posts', 'zm_filter_field' ); function zm_posts_filter( $query ) { global $pagenow; if ( is_admin() && $pagenow=='edit.php' && isset( $_GET['ZMINGCX_FILTER_FIELD']) && $_GET['ZMINGCX_FILTER_FIELD'] != '' )  { $query->query_vars['meta_key'] = $_GET['ZMINGCX_FILTER_FIELD']; if ( isset($_GET['ZMINGCX_FIELD_VALUE'] ) && $_GET['ZMINGCX_FIELD_VALUE'] != '' ) $query->query_vars['meta_value'] = $_GET['ZMINGCX_FIELD_VALUE']; } } function zm_filter_field() { global $wpdb; $sql = 'SELECT DISTINCT meta_key FROM '.$ wpdb->postmeta.' ORDER BY 1'; $fields = $wpdb->get_results( $sql, ARRAY_N ); ?> <select name="ZMINGCX_FILTER_FIELD"> <option value=""><? Php _e ('Custom Field ',' zm ');?></ option> <? php $current = isset( $_GET['ZMINGCX_FILTER_FIELD'] )? $_ GET['ZMINGCX_FILTER_FIELD']:''; $current_v = isset( $_GET['ZMINGCX_FIELD_VALUE'] )? $_ GET['ZMINGCX_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 ',' zm ');?>< input type="TEXT" name="ZMINGCX_FIELD_VALUE" value="<? php echo $current_v; ?>" /> <? php }