Add multiple checkbox into general settings - mdhemalakhand1999/WordPressPluginDevelopment GitHub Wiki

/**
 * Create multiple select checkbox
 */

function ptc_multiple_select_checkbox() {
    add_settings_field('multiple_select_country', 'Select Your Country', 'multiple_select_country_callback', 'general');
    register_setting( 'general', 'multiple_select_country' );
}
add_action('admin_init', 'ptc_multiple_select_checkbox');
function multiple_select_country_callback() {
    $options = get_option('multiple_select_country');
    $countries = array(
        'Bangladesh',
        'Africa',
        'Malaysia',
        'Maldives',
        'New York',
        'Netherland',
        'Australia'
    );
    foreach($countries as $country) {
        $country_checked = '';
        if(is_array($options) && in_array($country, $options)) {
            $country_checked = 'checked';
        }
        printf("<input type='checkbox' name='multiple_select_country[]' value='%s' %s /> %s<br/>", $country, $country_checked, $country);
    }
}