wordpress管理画面の、投稿一覧に新しくカスタムフィールドを表示する列を追加してくれと言われたら。

/**
* 新しい列を日付の前に追加。
*/
function add_cfield_on_posts_columns($columns) {
	global $post;
	if ( $post->post_type == 'post' ) { 
		$date_escape = $columns['date']; 
		unset($columns['date']); 
		$columns['new_custom_field'] = "Custom field"; 
		$columns['date'] = $date_escape; 
	}
	return $columns;
}



/**
* 作った列にカスタムフィールドの値を表示 
*/ 
function show_cfield_on_the_new_column( $column_name ) {
	global $post;
	
	$columns = array(
		array(
			'col' => 'new_custom_field',
			'cf'  => 'custom_field_name'
		), 
	);

	foreach ($columns as $key => $value) {
		if ( $post->post_type == 'post' && $column_name == $value['col'] ) {
			$custom_field = $value['cf'];
			$new_custom_field = get_post_meta($post->ID, $custom_field, true);

			echo $new_custom_field;
		}
	}
}

add_filter( 'manage_posts_columns', 'add_cfield_on_posts_columns' );
add_action( 'manage_posts_custom_column', 'add_new_column'  );

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