How to save plugin custom settings page fields

Question

Something was wrong with the naming, I had to change the field names, and it works ok.

From your code sample, this:

            add_settings_field(
                'frontend-font', // id attribute of tag
                __('بارگذاری فونت برای بخش اصلی سایت', 'persianfont'), // Title as lable for field
                function(){
                    var_dump(get_option( 'persianfont' ));
                    //$check_frontend_font = is_null(get_option( 'persianfont' )['frontend-font']) ? 'true' : get_option( 'persianfont' )['frontend-font'];
                    ?>
                    <input type="checkbox" name="frontend-font" id="frontend-font" value="true" <?php //checked( 'true', $check_frontend_font ); ?> />
                    <?php
                }, // Callback function to echo input tag
                $this->plugin_slug, // plugin slug, created by add_options_page()
                'load-font-setting', // slug-name of the section
                [
                    'label_for' => 'frontend-font', // label for => tag id
                    'class'     => 'frontend-font', // class for <tr>
                ]
            );

should be modified to:

add_settings_field(
        'frontend-font', // id attribute of tag
        __( 'بارگذاری فونت برای بخش اصلی سایت', 'persianfont' ), // Title as lable for field
        function ($args) {

            //$check_frontend_font = is_null(get_option( 'persianfont' )['frontend-font']) ? 'true' : get_option( 'persianfont' )['frontend-font'];
            $persian_font = get_option('persianfont');
            $frontend = !empty( $persian_font ['frontend'] ) ? $persian_font['frontend'] : false;
            ?>
            <input type="checkbox" name="persianfont[frontend]" id="frontend-font"
                   value="true" <?php checked( 'true', $frontend );
            ?> />
            <?php
        }, // Callback function to echo input tag
        $this->plugin_slug, // plugin slug, created by add_options_page()
        'load-font-setting', // slug-name of the section
        [
            'label_for' => 'frontend-font', // label for => tag id
            'class'     => 'frontend-font',    // class for <tr>
        ]
    );

And the other one:

add_settings_field(
        'backend-font', // id attribute of tag
        __( 'بارگذاری فونت برای بخش مدیریت', 'persianfont' ), // Title as lable for field
        function ($args) {
            $persian_font = get_option('persianfont');
            $backend = !empty( $persian_font ['backend'] ) ? $persian_font['backend'] : false;
            //$check_backend_font = is_null(get_option( 'persianfont' )['backend-font']) ? 'true' : get_option( 'persianfont' )['backend-font'];
            ?>
            <input type="checkbox" name="persianfont[backend]" id="backend-font"
                   value="true" <?php checked( 'true', $backend );
            ?> />
            <?php
        }, // Callback function to echo input tag
        $this->plugin_slug, // plugin slug, created by add_options_page()
        'load-font-setting', // slug-name of the section
        [
            'label_for' => 'backend-font', // label for => tag id
            'class'     => 'backend-font',    // class for <tr>
        ]
    );

I’ve made changes to callback function only.

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