wp_cache_post_id() │ WPSCache 1.0

No Hooks.

Returns

null. Nothing (null).

Usage

wp_cache_post_id();

wp_cache_post_id() code WPSCache 3.1.0

wp-super-cache/wp-cache-phase2.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 ) && is_array( $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;
}