<?php
$all_administrators = get_users(array('role' => 'Administrator'));

foreach ($all_administrators as $key => $admin_user) {
    $hidden_widgets = get_user_option('metaboxhidden_dashboard', $admin_user->ID);

    if( !is_array($hidden_widgets) )
        $hidden_widgets = array();

    // Hide widget of Companion Sitemap Generator
    if( !in_array('csg-sitemap-gen', $hidden_widgets) ) {
        array_push($hidden_widgets, 'csg-sitemap-gen');
        update_user_option($admin_user->ID, 'metaboxhidden_dashboard', $hidden_widgets);
    }
    // Hide widget PHP LOG
    if( !in_array('ws_php_error_log', $hidden_widgets) ) {
        array_push($hidden_widgets, 'ws_php_error_log');
        update_user_option($admin_user->ID, 'metaboxhidden_dashboard', $hidden_widgets);
    }
}