general-settings.php

add_filter('admin_init', 'msf_general_settings_register_fields');
 
function msf_general_settings_register_fields()
{
    register_setting('general', 'homepage_image', 'esc_attr');
    add_settings_field('homepage_image', '<label for="homepage_image">'.__('Homepage Header Image' , 'homepage_image' ).'</label>' , 'msf_general_settings_fields_html', 'general');
}
 
function msf_general_settings_fields_html()
{
    $value = get_option( 'homepage_image', '' );
    echo '<input class="regular-text" type="url" id="homepage_image" name="homepage_image" value="' . $value . '" />';
}