Disable Theme Editors and Plugin Editors from Dashboard

functions.php

// remove editor for plugins and themes. */
define( 'DISALLOW_FILE_EDIT', true );

// remove wp version meta tag and from rss feed. */
function wprv_remove_version() {
return '';
}
add_filter('the_generator', 'wprv_remove_version');

//Remove error mesage in login. */
add_filter('login_errors',create_function('$a', "return 'Invalid Input';"));

/*Disable ping back scanner and complete xmlrpc class. */
add_filter( 'wp_xmlrpc_server_class', '__return_false' );
add_filter('xmlrpc_enabled', '__return_false');

/*Disable pingbacks */
add_filter( 'xmlrpc_methods', 'remove_xmlrpc_pingback_ping' );
function remove_xmlrpc_pingback_ping( $methods ) {
   unset( $methods['pingback.ping'] );
   return $methods;
} ;