PHP redirects

head_redirect.php

<?php
add_action ('wp_head', 'rkv_new_redirects', 1); // create redirects

function rkv_new_redirects() {
	$newurl	= 'http://mynewurl.com';
	$slug	= basename(get_permalink());
	$cat	= get_query_var('cat');
	$cat_s	= get_category ($cat);
	$c_slug	= $cat_s->slug;
	// set up
	if (is_home() || is_front_page() ) {
		header('HTTP/1.1 301 Moved Permanently');
		header('Location: '.$newurl.'/');
	}	
	elseif (is_category() ) {
		header('HTTP/1.1 301 Moved Permanently');
		header('Location: '.$newurl.'/category/'.$c_slug.'/');
	}
	elseif (is_page() ) {
		header('HTTP/1.1 301 Moved Permanently');
		header('Location: '.$newurl.'/'.$slug.'/');
	}
	elseif (is_singular('post') ) { // may take some tweaking depending on site URL structure
		header('HTTP/1.1 301 Moved Permanently');
		header('Location: '.$newurl.'/'.$slug.'/');
	}
	else {
		header('HTTP/1.1 301 Moved Permanently');
		header('Location: '.$newurl.'/');
	}
}
?>