wp-strava/lib/WPStrava/SOMEnglish.php

<?php

/**
 * SOM English class.
 *
 * All conversions are limited to 2 decimal places.
 */
class WPStrava_SOMEnglish extends WPStrava_SOM {

	/**
	 * Change meters to miles.
	 *
	 * @param float $m Distance in meters.
	 * @return float Distance in miles.
	 */
	public function distance( $m ) {
		return number_format( $m / 1609.344, 2 );
	}

	/**
	 * Change miles to meters.
	 *
	 * @param float $dist Distance in miles.
	 * @return float Distance in meters.
	 */
	public function distance_inverse( $dist ) {
		return $dist * 1609.344;
	}

	/**
	 * Abbreviated label for this system of measure's distance - Miles: mi.
	 *
	 * @return string 'mi.'
	 */
	public function get_distance_label() {
		return __( 'mi.', 'wp-strava' );
	}

	/**
	 * Change meters per second to miles per hour.
	 *
	 * @param float $mps Meters per second.
	 * @return float Miles per hour.
	 */
	public function speed( $mps ) {
		return number_format( $mps * 2.2369, 2 );
	}

	/**
	 * Abbreviated label for this system of measure's speed - Miles Per Hour: mph
	 *
	 * @return string 'mph'
	 */
	public function get_speed_label() {
		return __( 'mph', 'wp-strava' );
	}

    /**
     * Change meters per second to Minutes Per Mile.
     *
     * @param float $mps Meters per second.
     * @return float Minutes Per Mile.
     */
    public function pace( $mps ) {

        $mph = $mps * 2.2369;
        $s = 3600 / $mph;
        $ss = $s/60;
        $ms = floor($ss)*60;
        $sec = round($s-$ms);
        $min = floor(60/$ss);

        return "$min:$sec";
    }

    /**
     * Abbreviated label for this system of measure's pace - Minutes Per Mile: min/mile
     *
     * @return string 'min/mile'
     */
    public function get_pace_label() {
        return __( 'min/mile', 'wp-strava' );
    }

    /**
     * Change meters per second to Minutes Per 100 Meters.
     *
     * @param float $mps Meters per second.
     * @return float Minutes Per 100 Meters.
     */
    public function swimpace( $mps ) {

        $kmh = $mps * 3.6;
        $min100m = 60/$kmh/10;

        return number_format( $min100m, 2 );

    }

    /**
     * Abbreviated label for this system of measure's pace - Minutes Per 100 Meters: min/100m
     *
     * @return string 'min/100m'
     */
    public function get_swimpace_label() {
        return __( 'min/100m', 'wp-strava' );
    }

	/**
	 * Change meters to feet.
	 *
	 * @param float $m Elevation in meters.
	 * @return float Elevation in feet.
	 */
	public function elevation( $m ) {
		return number_format( $m / 0.3048, 2 );
	}

	/**
	 * Abbreviated label for this system of measure's elevation - Feet: ft.
	 *
	 * @return string 'ft.'
	 */
	public function get_elevation_label() {
		return __( 'ft.', 'wp-strava' );
	}
}