Initial commit

wp-content/plugins/disable-wordpress-core-update/disable-core-update.php

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+<?php
+/*
+Plugin Name:  Disable WordPress Core Updates
+Description:  Disables WordPress core update checks and notifications.
+Plugin URI:   https://lud.icro.us/disable-wordpress-core-update/
+Version:      1.5
+Author:       John Blackbourn
+Author URI:   https://johnblackbourn.com/
+License:      GPL v2 or later
+Network:      true
+
+Props: Matt Mullenweg, _ck_, miqrogroove
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+*/
+
+# 2.3 to 2.7:
+add_action( 'init', create_function( '$a', "remove_action( 'init', 'wp_version_check' );" ), 2 );
+add_filter( 'pre_option_update_core', create_function( '$a', "return null;" ) );
+
+# 2.8+:
+remove_action( 'wp_version_check', 'wp_version_check' );
+remove_action( 'admin_init', '_maybe_update_core' );
+add_filter( 'pre_transient_update_core', create_function( '$a', "return null;" ) );
+
+# 3.0+:
+add_filter( 'pre_site_transient_update_core', create_function( '$a', "return null;" ) );