Vista demo wp

<?php
add_action( 'admin_menu', 'vista_add_admin_menu' );
add_action( 'admin_init', 'vista_settings_init' );


function vista_add_admin_menu(  ) {

    add_menu_page( 'Vista', 'Vista', 'manage_options', 'vista', 'vista_options_page' );

}


function vista_settings_exist(  ) {

    if( false == get_option( 'vista_settings' ) ) {

        add_option( 'vista_settings' );

    }

}


function vista_settings_init(  ) {

    register_setting( 'pluginPage', 'vista_settings' );

    add_settings_section(
        'vista_pluginPage_section',
        __( 'Your section description', 'vista' ),
        'vista_settings_section_callback',
        'pluginPage'
    );

    add_settings_field(
        'vista_text_field_0',
        __( 'Settings field description', 'vista' ),
        'vista_text_field_0_render',
        'pluginPage',
        'vista_pluginPage_section'
    );

    add_settings_field(
        'vista_text_field_1',
        __( 'Settings field description', 'vista' ),
        'vista_text_field_1_render',
        'pluginPage',
        'vista_pluginPage_section'
    );

    add_settings_field(
        'vista_select_field_2',
        __( 'Settings field description', 'vista' ),
        'vista_select_field_2_render',
        'pluginPage',
        'vista_pluginPage_section'
    );

    add_settings_field(
        'vista_checkbox_field_3',
        __( 'Settings field description', 'vista' ),
        'vista_checkbox_field_3_render',
        'pluginPage',
        'vista_pluginPage_section'
    );

    add_settings_field(
        'vista_textarea_field_4',
        __( 'Settings field description', 'vista' ),
        'vista_textarea_field_4_render',
        'pluginPage',
        'vista_pluginPage_section'
    );

    add_settings_field(
        'vista_radio_field_5',
        __( 'Settings field description', 'vista' ),
        'vista_radio_field_5_render',
        'pluginPage',
        'vista_pluginPage_section'
    );

    add_settings_field(
        'vista_radio_field_6',
        __( 'Settings field description', 'vista' ),
        'vista_radio_field_6_render',
        'pluginPage',
        'vista_pluginPage_section'
    );


}


function vista_text_field_0_render(  ) {

    $options = get_option( 'vista_settings' );
    ?>
    <input type='text' name='vista_settings[vista_text_field_0]' value='<?php echo $options['vista_text_field_0']; ?>'>
    <?php

}


function vista_text_field_1_render(  ) {

    $options = get_option( 'vista_settings' );
    ?>
    <input type='text' name='vista_settings[vista_text_field_1]' value='<?php echo $options['vista_text_field_1']; ?>'>
    <?php

}


function vista_select_field_2_render(  ) {

    $options = get_option( 'vista_settings' );
    ?>
    <select name='vista_settings[vista_select_field_2]'>
        <option value='1' <?php selected( $options['vista_select_field_2'], 1 ); ?>>Option 1</option>
        <option value='2' <?php selected( $options['vista_select_field_2'], 2 ); ?>>Option 2</option>
    </select>

<?php

}


function vista_checkbox_field_3_render(  ) {

    $options = get_option( 'vista_settings' );
    ?>
    <input type='checkbox' name='vista_settings[vista_checkbox_field_3]' <?php checked( $options['vista_checkbox_field_3'], 1 ); ?> value='1'>
    <?php

}


function vista_textarea_field_4_render(  ) {

    $options = get_option( 'vista_settings' );
    ?>
    <textarea cols='40' rows='5' name='vista_settings[vista_textarea_field_4]'>
        <?php echo $options['vista_textarea_field_4']; ?>
    </textarea>
    <?php

}


function vista_radio_field_5_render(  ) {

    $options = get_option( 'vista_settings' );
    ?>
    <input type='radio' name='vista_settings[vista_radio_field_5]' <?php checked( $options['vista_radio_field_5'], 1 ); ?> value='1'>
    <?php

}


function vista_radio_field_6_render(  ) {

    $options = get_option( 'vista_settings' );
    ?>
    <input type='radio' name='vista_settings[vista_radio_field_6]' <?php checked( $options['vista_radio_field_6'], 1 ); ?> value='1'>
    <?php

}


function vista_settings_section_callback(  ) {

    echo __( 'This section description', 'vista' );

}


function vista_options_page(  ) {

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

        <h2>Vista</h2>

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

    </form>
    <?php

}

?>