WordPress: Print jQuery in footer on front-end.

load-jquery-in-footer-php53.php

<?php
/**
 * Prints jQuery in footer on front-end.
 * For PHP > 5.3
 */
add_action(
	'wp_default_scripts',
	function( &$scripts ) {
		if ( ! is_admin() )
			$scripts->add_data( 'jquery', 'group', 1 );
	}
);

load-jquery-in-footer.php

<?php
/**
 * Prints jQuery in footer on front-end.
 */
function ds_print_jquery_in_footer( &$scripts) {
	if ( ! is_admin() )
		$scripts->add_data( 'jquery', 'group', 1 );
}
add_action( 'wp_default_scripts', 'ds_print_jquery_in_footer' );