WordPress at a glance
function is not described

wp_cache_post_id() WPSCache 1.0

No Hooks.

Return

Null. Nothing.

Usage

wp_cache_post_id();

Code of wp_cache_post_id() WPSCache 1.7.1

<?php
function wp_cache_post_id() {
	global $posts, $comment_post_ID, $post_ID;
	// We try hard all options. More frequent first.
	if ($post_ID > 0 ) return $post_ID;
	if ($comment_post_ID > 0 )  return $comment_post_ID;
	if (is_singular() && !empty($posts)) return $posts[0]->ID;
	if (isset( $_GET[ 'p' ] ) && $_GET['p'] > 0) return $_GET['p'];
	if (isset( $_POST[ 'p' ] ) && $_POST['p'] > 0) return $_POST['p'];
	return 0;
}