Is_Custom_Post_Type() - Joshua David Nelson

Checks if the current post is a custom post type, returns boolean. Very handy when working with custom post types, layouts and the like.

	<?php
	/**
	* Checks if current post is a custom post type, returns boolean
	*
	* @author Joshua David Nelson
	* @link http://joshuadnelson.com/code/is_custom_post_type/
	*/

	if ( !function_exists( 'is_custom_post_type' ) ) {
	function is_custom_post_type() {

	// find custom post types
	$args = array(
	//'public' => true, // -- uncomment if you only want "public" cpts
	'_builtin' => false,
	);
	$output = 'names';
	$public_custom_post_types = get_post_types( $args, $output );

	// if there are no custom post types, then the current post can't be one
	if( empty( $public_custom_post_types ) )
	return false;

	// access global variable
	global $post;

	// get the current post type, returns a string or false on failure
	$post_type = get_post_type( $post );

	// check if current post type is a custom post type
	if ( $post_type && in_array( $post_type, $public_custom_post_types ) ) {
	return true;
	} else {
	return false;
	}

	// if all else fails, return false
	return false;

	}
	}