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magic __tostring and comparator methods
Objects in PHP example from a Well House Consultants training course
More on Objects in PHP [link]
Source code: rest006.php Module: H108
<?php
# magic __tostring and comparator methods # We run 4 different PHP courses - see http://www.wellho.net/course/php.html error_reporting(E_ALL); class table { function __construct($w,$h,$name) { $this->wid = $w; $this->hei = $h; $this->name = $name; } function getseats() { return 2 * (floor($this->wid / 800) + floor($this->hei / 800)); } function getname() { return $this->name; } function getdoggie() { if ($this->wid > $this->hei) { return $this->hei / 2;} return $this->wid / 2; } static function factory($material) { $pieces = explode(" ",trim($material)); if (strpos($pieces[0] ,"#") > -1) { return False; } if (count($pieces) < 2) { return False; } $ww = array_shift($pieces); $hh = array_shift($pieces); $name = implode(" ",$pieces); if ($ww == "%") { $tabby = new roundtable($hh,$name); } else { $tabby = new table($ww,$hh,$name); } return $tabby; } function __tostring() { $wotsit = get_class($this); $ts = sprintf("$wotsit; %dx%d; etc",$this->wid,$this->hei); return $ts; } function morepeoplethan($that) { $c1 = $this->getseats(); $c2 = $that->getseats(); return ($c1 > $c2); } } class roundtable extends table { function __construct($h,$name) { $this->wid = $h; $this->hei = $h; $this->name = $name; } function getseats() { return floor(3.14159 * $this->wid /800); } } // ------------------------------------------------- $restaurant = array() ; $fh = fopen("r5.txt","r"); while ($record = fgets($fh)) { $makes = table::factory($record); if ($makes) array_push($restaurant,$makes); } foreach ($restaurant as $rt) { $bums = $rt->getseats(); $called = $rt->getname(); $woof = $rt->getdoggie(); print ("We can seat $bums at $rt in $called. DD is $woof\n"); } $john = $restaurant[2]; $jane = $restaurant[4]; if ($john->morepeoplethan($jane)) { print ("MOST capacity is $john\n"); } else { print ("Most capacity is $jane\n"); } /* sample output munchkin:apr13 grahamellis$ php rest006.php We can seat 6 at table; 2000x1500; etc in Window. DD is 750 We can seat 4 at table; 1200x1000; etc in The Snug. DD is 500 We can seat 4 at table; 1200x1000; etc in The Snug. DD is 500 We can seat 4 at table; 1200x1000; etc in The Snug. DD is 500 We can seat 2 at table; 700x1500; etc in The Staff Half. DD is 350 We can seat 7 at roundtable; 1800x1800; etc in Left Round. DD is 900 We can seat 8 at roundtable; 2100x2100; etc in Right Round. DD is 1050 MOST capacity is table; 1200x1000; etc munchkin:apr13 grahamellis$ */ ?> Learn about this subject
This module and example are covered on the following public courses:
* Object Oriented Programming in PHP * PHP Programming * Learning to program in PHP Also available on on site courses for larger groups Books covering this topic
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