get_template_part() doesn't work

Question

I use get_template_part() function to get theme options page content like this:

function setup_theme_admin_menus() {
    add_theme_page( "Theme Options", "Theme Options", "read", "theme_options", "theme_options" );
}
function theme_options() {
    get_template_part("content","options");
}

And it seems to work perfect when I use it on my localhost but when I relocated it online it stopped rendering desired HTML. When I use something like:

function theme_options() {
    echo "Hello World!";
}

It works as expected both online and locally. No idea why it is happening.

Answer 1

The get_template_part() function is intended to include a template-part file in the template - i.e. on the front end.

Use include() instead, along with get_template_directory():

function theme_options() {
    include( get_template_directory() . '/content-options.php' );
}