README

A powerful PHP utility class for calculating geographical distances between coordinates using the Haversine formula. This library provides a clean, intuitive interface for accurate distance calculations in both miles and kilometers, with special integration for WordPress environments.

Features

• 🌍 Multi-Unit Support: Calculate distances in miles or kilometers
• 🎯 Precision: Results rounded to 2 decimal places for practical use
• 🛡️ Input Validation: Comprehensive coordinate and unit validation
• 📐 Haversine Formula: Accurate great-circle distance calculations
• 🔒 Type Safety: Full type hinting and return type declarations
• ⚡ Simple Interface: Easy to understand and implement
• 🔄 WordPress Integration: Native WP_Error support when in WordPress environment
• 🚫 Error Handling: Flexible error handling for both WordPress and standalone use

Requirements

• PHP 7.4 or later
• WordPress

Installation

Install via Composer:

composer require arraypress/geodistance

Basic Usage

use ArrayPress\Utils\Math\GeoDistance;

// New York coordinates
$pointA = [ 'latitude' => 40.7128, 'longitude' => -74.0060 ];

// London coordinates
$pointB = [ 'latitude' => 51.5074, 'longitude' => -0.1278 ];

// Initialize calculator
$calculator = new GeoDistance( $pointA, $pointB );

$distance = $calculator->get_distance();
if ( is_wp_error( $distance ) ) {
    echo $distance->get_error_message();
} else {
    echo "Distance: $distance {$calculator->get_unit()}";
}

Point Management

Getting Points

// Get current coordinates
$pointA = $calculator->get_point_a();
$pointB = $calculator->get_point_b();

Setting Points

// WordPress Environment
$result = $calculator->set_point_a([
    'latitude'  => 35.6762,
    'longitude' => 139.6503
]);

if ( is_wp_error( $result ) ) {
    echo $result->get_error_message();
}

Checking if a Point is Within Radius

// Central Park, New York
$centralPoint = [ 'latitude' => 40.7829, 'longitude' => -73.9654 ];

// Times Square coordinates
$targetPoint = [ 'latitude' => 40.7580, 'longitude' => -73.9855 ];

// Initialize calculator with central point
$calculator = new GeoDistance( $centralPoint, $targetPoint );

// WordPress Environment
$radius = 2; // 2 miles radius
$isWithin = $calculator->is_within_radius( $targetPoint, $radius );
if ( is_wp_error( $isWithin ) ) {
    echo $isWithin->get_error_message();
} else {
    echo $isWithin ? "Location is within {$radius} {$calculator->get_unit()} radius" : "Location is outside radius";
}

Unit Management

Getting and Setting Units

// Get current unit
$currentUnit = $calculator->get_unit();

// WordPress Environment
$result = $calculator->set_unit( 'km' );
if ( is_wp_error( $result ) ) {
    echo $result->get_error_message();
}

Error Handling

WordPress Environment

// Check for errors using WP_Error
$calculator = new GeoDistance( $pointA, $pointB );

$result = $calculator->set_unit('invalid_unit');
if ( is_wp_error( $result ) ) {
    echo $result->get_error_message();
    echo $result->get_error_code();
}

// Get the last error
$lastError = $calculator->get_last_error();
if ( $lastError instanceof WP_Error ) {
    echo $lastError->get_error_message();
}

Error Codes

The library uses the following error codes when in a WordPress environment:

• invalid_coordinates: Missing latitude or longitude keys
• invalid_latitude: Latitude value out of range (-90 to 90)
• invalid_longitude: Longitude value out of range (-180 to 180)
• invalid_unit: Unsupported unit of measurement
• calculation_error: Error during distance calculation

Use Cases

• Distance Calculation: Calculate distances between geographical points
• Location-Based Services: Determine proximity between locations
• Travel Applications: Calculate travel distances
• Geofencing: Determine if points are within specific distances
• Delivery Services: Calculate shipping distances and zones
• WordPress Integration: Seamless integration with WordPress applications

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the GPL-2.0-or-later License.

Support

• Documentation
• Issue Tracker