Add weight and length conversion functions

Author: haj8110

Conversions/Lengthconversions.php

@@ -0,0 +1,107 @@
+<?php
+/**
+ * Class for converting length between different units.
+ */
+class LengthConversions {
+    /**
+     * Validates input for conversion methods
+     * 
+     * @param mixed $value The value to check
+     * @param string $method The method name for error message
+     * @throws InvalidArgumentException
+     */
+    private static function validateInput($value, $method) {
+        // Make sure we have a numeric value
+        if (!is_numeric($value)) {
+            throw new InvalidArgumentException("Invalid input for $method");
+        }
+    }
+
+    /**
+     * Converts meters to kilometers.
+     *
+     * @param float $meters The length in meters.
+     * @return float The equivalent length in kilometers.
+     */
+    public static function mToKm($meters) {
+        self::validateInput($meters, 'mToKm');
+        return round($meters / 1000, 4);
+    }
+    
+    /**
+     * Converts kilometers to meters.
+     *
+     * @param float $kilometers The length in kilometers.
+     * @return float The equivalent length in meters.
+     */
+    public static function kmToM($kilometers) {
+        self::validateInput($kilometers, 'kmToM');
+        return round($kilometers * 1000, 4);
+    }
+    
+    /**
+     * Converts meters to miles.
+     *
+     * @param float $meters The length in meters.
+     * @return float The equivalent length in miles.
+     */
+    public static function mToMiles($meters) {
+        self::validateInput($meters, 'mToMiles');
+        return round($meters / 1609.34, 6);
+    }
+    
+    /**
+     * Converts miles to meters.
+     *
+     * @param float $miles The length in miles.
+     * @return float The equivalent length in meters.
+     */
+    public static function milesToM($miles) {
+        self::validateInput($miles, 'milesToM');
+        return round($miles * 1609.34, 4);
+    }
+    
+    /**
+     * Converts inches to centimeters.
+     *
+     * @param float $inches The length in inches.
+     * @return float The equivalent length in centimeters.
+     */
+    public static function inToCm($inches) {
+        self::validateInput($inches, 'inToCm');
+        return round($inches * 2.54, 4);
+    }
+    
+    /**
+     * Converts centimeters to inches.
+     *
+     * @param float $centimeters The length in centimeters.
+     * @return float The equivalent length in inches.
+     */
+    public static function cmToIn($centimeters) {
+        self::validateInput($centimeters, 'cmToIn');
+        return round($centimeters / 2.54, 2);
+    }
+    
+    /**
+     * Converts kilometers to miles.
+     *
+     * @param float $km The length in kilometers.
+     * @return float The equivalent length in miles.
+     */
+    public static function kmToMiles($km) {
+        self::validateInput($km, 'kmToMiles');
+        return round($km / 1.609, 5);
+    }
+    
+    /**
+     * Converts miles to kilometers.
+     *
+     * @param float $miles The length in miles.
+     * @return float The equivalent length in kilometers.
+     */
+    public static function milesToKm($miles) {
+        self::validateInput($miles, 'milesToKm');
+        return round($miles * 1.609, 4);
+    }
+}

Conversions/Weightconversions.php

@@ -0,0 +1,87 @@
+<?php
+/**
+ * Class for converting weight between different units.
+ */
+class WeightConversions {
+    /**
+     * Validates input for conversion methods
+     * 
+     * @param mixed $value The value to check
+     * @param string $method The method name for error message
+     * @throws InvalidArgumentException
+     */
+    private static function validateInput($value, $method) {
+        // Make sure we have a numeric value
+        if (!is_numeric($value)) {
+            throw new InvalidArgumentException("Invalid input for $method");
+        }
+    }
+
+    /**
+     * Converts kilograms to pounds.
+     *
+     * @param float $kg The weight in kilograms.
+     * @return float The equivalent weight in pounds.
+     * @see https://en.wikipedia.org/wiki/Kilogram
+     */
+    public static function kgToLbs($kg) {
+        self::validateInput($kg, 'kgToLbs');
+        return round($kg * 2.20462, 4);
+    }
+
+    /**
+     * Converts pounds to kilograms.
+     *
+     * @param float $lbs The weight in pounds.
+     * @return float The equivalent weight in kilograms.
+     * @see https://en.wikipedia.org/wiki/Pound_(mass)
+     */
+    public static function lbsToKg($lbs) {
+        self::validateInput($lbs, 'lbsToKg');
+        return round($lbs / 2.20462, 4);
+    }
+
+    /**
+     * Converts grams to kilograms.
+     *
+     * @param float $grams The weight in grams.
+     * @return float The equivalent weight in kilograms.
+     */
+    public static function gToKg($grams) {
+        self::validateInput($grams, 'gToKg');
+        return round($grams / 1000, 4);
+    }
+
+    /**
+     * Converts kilograms to grams.
+     *
+     * @param float $kg The weight in kilograms.
+     * @return float The equivalent weight in grams.
+     */
+    public static function kgToG($kg) {
+        self::validateInput($kg, 'kgToG');
+        return round($kg * 1000, 4);
+    }
+
+    /**
+     * Converts ounces to pounds.
+     *
+     * @param float $oz The weight in ounces.
+     * @return float The equivalent weight in pounds.
+     */
+    public static function ozToLbs($oz) {
+        self::validateInput($oz, 'ozToLbs');
+        return round($oz / 16, 4);
+    }
+
+    /**
+     * Converts pounds to ounces.
+     *
+     * @param float $lbs The weight in pounds.
+     * @return float The equivalent weight in ounces.
+     */
+    public static function lbsToOz($lbs) {
+        self::validateInput($lbs, 'lbsToOz');
+        return round($lbs * 16, 4);
+    }
+}