I’ve been making a plugin for wordpress that adds two simple text field options. The options are saved successfully in plugin options page but don’t work, it doesn’t output saved options.

Here’s the code:

add_action( 'admin_menu', 'viptips_add_admin_menu' );
add_action( 'admin_init', 'viptips_settings_init' );


function viptips_add_admin_menu(  ) { 
  $icon       = 'dashicons-editor-table';
    add_menu_page( 'VIP Tips', 'VIP Tips', 'manage_options', 'vip_tips', 'viptips_options_page', $icon );

}


function viptips_settings_init(  ) { 

    register_setting( 'pluginPage', 'viptips_settings' );

    add_settings_section(
        'viptips_pluginPage_section', 
        __( 'Main plugin options', 'viptips' ), 
        'viptips_settings_section_callback', 
        'pluginPage'
    );

    add_settings_field( 
        'viptips_category_name', 
        __( 'Category name:', 'viptips' ), 
        'viptips_category_name_render', 
        'pluginPage', 
        'viptips_pluginPage_section' 
    );

    add_settings_field( 
        'viptips_postperpage', 
        __( 'Number of posts:', 'viptips' ), 
        'viptips_postperpage_render', 
        'pluginPage', 
        'viptips_pluginPage_section' 
    );


}


function viptips_category_name_render(  ) { 

    $options = get_option( 'viptips_settings' );
    ?>
  <input type='text' name='viptips_settings[viptips_category_name]' value='<?php echo $options['viptips_category_name']; ?>'>
  <p class="description" id="tagline-description">Name of the category that contains predictions</p>
    <?php

}


function viptips_postperpage_render(  ) { 

    $options = get_option( 'viptips_settings' );
    ?>
  <input type='number' name='viptips_settings[viptips_postperpage]' value='<?php echo $options['viptips_postperpage']; ?>'>
  <p class="description" id="tagline-description">Number of posts to be displayed in table.</p>
    <?php

}


function viptips_settings_section_callback(  ) { 

    echo __( 'Don't forget to use the <strong>[tabscat]</strong> shortcode, in the page you want the tips table to be displayed!*', 'viptips' );

}


function viptips_options_page(  ) { 

        ?>
        <form action='options.php' method='post'>

            <h1>VIP Tips</h1>

            <?php
            settings_fields( 'pluginPage' );
            do_settings_sections( 'pluginPage' );
            submit_button();
            ?>

        </form>
        <?php

}

To output saved options, I use:

$category_name = get_option('viptips_category_name');
$postperpage = get_option('viptips_postperpage');


    $args = array(
     'post_type' => 'post',
     'post_status' => 'publish',
     'category_name' => $category_name,
     'post_per_page' => $postperpage
     );

Where did I go wrong?