How to hide your WordPress version number…completely

gistfile1.php

<?php
/* Hide WP version meta tag from header and generator tag from feeds
 * @return null
 * @filter the_generator
 */
function fjarrett_remove_wp_version_tag() {
	return null;
}
add_filter( 'the_generator', 'fjarrett_remove_wp_version_tag' );

/* Hide WP version strings from scripts and styles
 * @return {string} $src
 * @filter script_loader_src
 * @filter style_loader_src
 */
function fjarrett_remove_wp_version_strings( $src ) {
	global $wp_version;

	$parts = explode( '?', $src );

	if ( $parts[1] === 'ver=' . $wp_version ) {
		return $parts[0];
	}
	else {
		return $src;
	}
}
add_filter( 'script_loader_src', 'fjarrett_remove_wp_version_strings' );
add_filter( 'style_loader_src', 'fjarrett_remove_wp_version_strings' );

Originally posted on: http://frankiejarrett.com/how-to-hide-your-wordpress-version-number-completely/