How to make new plugin setting checkbox default as checked

Question

I have created a new plugin setting in an existing plugin that needs to be checked by default when users update to the new version because a lot of the original features are now activated by this checkbox.

This is the setting from my settings page:

<td>
    <?php printf(
        '<input id="bodhi_svgs_settings[advanced_mode]" name="bodhi_svgs_settings[advanced_mode]" type="checkbox" %2$s />', 'bodhi_svgs_settings_advanced_mode', checked( isset( $bodhi_svgs_options['advanced_mode'] ), true, false ) ); ?>
    <?php _e( 'Yes', 'svg-support' ); ?><br /><small class="description"><?php _e(' You don\'t need to enable this to simply use SVG files as images. Enabling this will trigger advanced options and SVG functionality such as inline rendering.', 'svg-support' ); ?></small>
</td>

I've looked at a number of solutions and can't seem to get it to work properly. I tried checked( isset( $bodhi_svgs_options['advanced_mode'] ), true ) but that outputs checked="checked" to the page. I can't figure out how to do it without rewriting the entire options to work a different way.

Answer 1

If you check the checkbox and save the plugin options it will add option to the {prefix}_options table in the database. To make a checkbox checked you need to update_option('option_id', 'value' ) for that checkbox on plugin activation. to do that you need to register plugin activation hook. Place the below code in the main plugin file.

register_activation_hook( __FILE__, 'am_plugin_activate' );
function am_plugin_activate() {
    // plugin activation code here...
    update_option('checkbox_id', true );
}

this will make the checkbox checked. to make the checkbox checked on plugin update you need to hook a function on upgrader_process_complete action hook. e.g;

add_action( 'upgrader_process_complete', 'am_plugin_upgrate',10, 2);
function am_plugin_upgrate( $upgrader_object, $options ) {
    // plugin update code here....
}

for reference please take a look at upgrader_process_complete, Discussion Plugin Activation Hooks and Plugin activation hook discussion