Create custom WordPress dashboard widget

create-custom-wordpress-dashboard-widget.php

<?php
/* ----------------------------------------------------------------------------
 * Create custom WordPress dashboard widget
 * ------------------------------------------------------------------------- */

function dashboard_widget_function() {
	echo '
		<h2>Custom Dashboard Widget</h2>
		<p>Custom content here</p>
	';
}

function add_dashboard_widgets() {
	wp_add_dashboard_widget( 'custom_dashboard_widget', 'Custom Dashoard Widget', 'dashboard_widget_function' );
}
add_action( 'wp_dashboard_setup', 'add_dashboard_widgets' );