get_template_part()

function get_template_part( $slug, $name = null, $args = array() ) {
	/**
	 * Fires before the specified template part file is loaded.
	 *
	 * The dynamic portion of the hook name, `$slug`, refers to the slug name
	 * for the generic template part.
	 *
	 * @since 3.0.0
	 * @since 5.5.0 The `$args` parameter was added.
	 *
	 * @param string      $slug The slug name for the generic template.
	 * @param string|null $name The name of the specialized template.
	 * @param array       $args Additional arguments passed to the template.
	 */
	do_action( "get_template_part_{$slug}", $slug, $name, $args );

	$templates = array();
	$name      = (string) $name;
	if ( '' !== $name ) {
		$templates[] = "{$slug}-{$name}.php";
	}

	$templates[] = "{$slug}.php";

	/**
	 * Fires before a template part is loaded.
	 *
	 * @since 5.2.0
	 * @since 5.5.0 The `$args` parameter was added.
	 *
	 * @param string   $slug      The slug name for the generic template.
	 * @param string   $name      The name of the specialized template.
	 * @param string[] $templates Array of template files to search for, in order.
	 * @param array    $args      Additional arguments passed to the template.
	 */
	do_action( 'get_template_part', $slug, $name, $templates, $args );

	if ( ! locate_template( $templates, true, false, $args ) ) {
		return false;
	}
}