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<?php

add_filter( 'option_active_plugins', 'test_blacklist_unneeded_plugins', 40 );

function test_blacklist_unneeded_plugins( $plugins ) {
    // We don't apply blacklisting to logged in users to prevent plugin deactivation
    if( isset( $_SERVER['HTTP_COOKIE'] ) && is_user_logged_muplugin() ) {
        return $plugins;
    }

// returns the path of the request URI without the query string
// see http://php.net/manual/en/function.parse-url.php
// and http://php.net/manual/en/reserved.variables.server.php
// and http://php.net/manual/en/url.constants.php
    $request_uri = parse_url( $_SERVER['REQUEST_URI'], PHP_URL_PATH );
    $query = $_SERVER['QUERY_STRING'];
    
    $is_admin = matchesAt( $request_uri, '/wp-admin/' );
    $is_homepage = ('/' === $request_uri) && (strpos( $query, 'preview' ) == false);

    $homepage_blacklisted_plugins = [
        'akismet',
        'amp',
        'facebook-comments-plugin',
    ];
    $single_post_blacklisted_plugins = [
        'layered-popups',
    ];

    if($is_homepage) {
        return filter_array( $plugins, $homepage_blacklisted_plugins );
    } elseif( !$is_admin ) {
        return filter_array( $plugins, $single_post_blacklisted_plugins );
    }

    return $plugins;
}

function matchesAt( $tested_string, $match_lookup, $position = 0) {
    return $position === strpos( $tested_string, $match_lookup );
}

function filter_array( $input_array, $blacklist_array ) {
    return array_values( array_filter( $input_array, function( $input_value ) use ( $blacklist_array ) {
        return empty( array_filter( $blacklist_array, function( $blacklisted_item ) use ( $input_value ) {
            return matchesAt( $input_value, $blacklisted_item );
        }) );
    }) );
}

function is_user_logged_muplugin() {
    $cookies_regex = '/' .
        'wordpress_sec_(?P<hashsec>[0-9a-f]+)=(?P<usersec>[0-9a-z_.\-@]+)' .
        '.*' .
        'wordpress_logged_in_(?P<hashlog>[0-9a-f]+)=(?P<userlog>[0-9a-z_.\-@]+)' .
        '|' .
        'wordpress_logged_in_\k{hashlog}=\k{userlog}' .
        '.*' .
        'wordpress_sec_\k{hashsec}=\k{usersec}' .
        '/';
    if( preg_match($cookies_regex, $_SERVER['HTTP_COOKIE'], $cookies_user) ) {
        if( $cookies_user['hashsec'] === $cookies_user['hashlog'] &&
            $cookies_user['usersec'] === $cookies_user['userlog'] ) {

            return true;

        }
    }
}