File: moon.php

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File: moon.php
Role: Class source
Content type: text/plain
Description: moon class
Class: Moon
Calculate the phase of the Moon for a given date
Author: By
Last change: fixes
Date: 11 years ago
Size: 2,661 bytes
 

 

Contents

Class file image Download
<?php

   
class moon {

        private
$date;

       
/*
         * set a property, only date at this time
         * @param prop
         * @param val
         * @return bool
         */
       
public function set($prop, $val) {
           
$r = false;
            switch (
$prop) {
                case
"date":
                   
$r = $this->date = is_numeric($val) ? $val : strtotime($val);
            }
            return (bool)
$r;
        }

       
/*
         * calc moon phase percentage for a date
         * @return int
         */
       
public function get_phase_percent() {
           
$r = false;
            if (
$this->date) {
               
$x = ($this->date - 603240) / 2551392;
               
$x -= (int) $x;
               
$r = round($x * 100);
            }
            return
$r;
        }

       
/*
         * calc moon visibility
         * @return int
         */
       
public function get_visibility() {
           
$r = false;
            if (
$this->date) $r = (50 - abs(50 - $this->get_phase_percent())) * 2;
            return
$r;
        }

       
/*
         * calc when new phase start
         * @param ts if true return unix timestamp
         * @return string
         */
       
public function get_next_newmoon($ts = false) {
           
$r = false;
            if (
$this->date) $r = $this->date + 2551392 - ($this->date - 603240) % 2551392;
            return
$ts ? $r : date("Y-m-d", $r);
        }

       
/*
         * calc next full moon
         * @param ts if true return unix timestamp
         * @return string
         */
       
public function get_next_fullmoon($ts = false) {
           
$r = false;
            if (
$this->date) $r = $this->get_next_newmoon(true) + 1275696;
            return
$ts ? $r : date("Y-m-d", $r);
        }

       
/*
         * get moon phase name
         * @return string
         */
       
public function get_phase_name() {
           
$r = false;
            if (
$this->date) {
               
$x = round($this->get_phase_percent() * 0.1) * 10;
                if (
$x == 0 || $x == 100) $r = "New";
                elseif (
$x > 0 && $x < 25) $r = "Waxing crescent";
                elseif (
$x == 25) $r = "First quarter";
                elseif (
$x > 25 && $x < 50) $r = "Waxing gibbous";
                elseif (
$x == 50) $r = "Full";
                elseif (
$x > 50 && $x < 75) $r = "Waning gibbous";
                elseif (
$x == 75) $r = "Last quarter";
                elseif (
$x > 75) $r = "Waning crescent";
            }
            return
$r;
        }

    }

?>


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