Calculate distance between 2 CPT's with

// Register shortcode
add_shortcode('distance_shortcode', 'distance_shortcode_function');

// Shortcode function
function distance_shortcode_function($atts) {
// Extract shortcode attributes
$atts = shortcode_atts(array(
'lata' => '',
'lona' => '',
'latb' => '',
'lonb' => '',
), $atts, 'distance_shortcode');

// Convert text values to numbers if they're not empty
$lata = !empty($atts['lata']) ? (float) $atts['lata'] : '';
$lona = !empty($atts['lona']) ? (float) $atts['lona'] : '';
$latb = !empty($atts['latb']) ? (float) $atts['latb'] : '';
$lonb = !empty($atts['lonb']) ? (float) $atts['lonb'] : '';

// Check if all coordinates are provided and numeric
if ($lata !== '' && $lona !== '' && $latb !== '' && $lonb !== '') {
// Calculate distance using Haversine formula
$distance = haversineDistance($lata, $lona, $latb, $lonb);
return round($distance, 2) . " km's";
} else {
return "Please provide valid latitude and longitude for both points.";
}
}

// Function to calculate distance using Haversine formula
function haversineDistance($lat1, $lon1, $lat2, $lon2) {
$earthRadius = 6371; // Radius of the Earth in kilometers
$deltaLat = deg2rad($lat2 - $lat1);
$deltaLon = deg2rad($lon2 - $lon1);
$a = sin($deltaLat / 2) * sin($deltaLat / 2) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * sin($deltaLon / 2) * sin($deltaLon / 2);
$c = 2 * atan2(sqrt($a), sqrt(1 - $a));
$distance = $earthRadius * $c;
return $distance;
}