WordPress函数get_the_ID()获取当前文章ID

此函数不接受任何参数

示例：

<?php
$id = get_the_ID();
$dropdown = "<select name='dropdown-".$id."' >";
$dropdown .= "<option id='option1-". $id ."'>Option 1</option>";
$dropdown .= "</select>";
?>

源文件：

/**
 * Retrieve the ID of the current item in the WordPress Loop.
 *
 * @since 2.1.0
 *
 * @return int|false The ID of the current item in the WordPress Loop. False if $post is not set.
 */
function get_the_ID() {
	$post = get_post();
	return ! empty( $post ) ? $post->ID : false;
}