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Complete inheritance and object method demonstration
Objects in PHP example from a Well House Consultants training course
More on Objects in PHP [link]
Source code: compo.php Module: H108
<?php
/* A demonstration of Object Oriention in PHP5 showing some key elements A. A base class "Transact". B. Extended to two subclasses "Income" and "Spend" 1. Polymorphic constructors 2. An array of objects based on type "Transact" 3. Comparator functions to compare 2 objects, and also to compare a whole array of objects 4. A user sort of a whole array of objects */ class transact { /* A Class of financial transactions */ protected $amount; protected $about; function getvalue() { return $this->amount; } function getabout() { return $this->about; } function morevaluable($that) { if ($this->getvalue() > $that->getvalue()) { return $this ; } return $that; } static function mostvaluable($thems) { $bsf = $thems[0]; foreach ($thems as $other) { $bsf = $bsf->morevaluable($other); } return $bsf; } static function mvf($first,$second) { if ($first->getvalue() > $second->getvalue()) return 1; if ($first->getvalue() < $second->getvalue()) return -1; return 0; } } /* Income and expenditure classes, based on the generic transaction */ class income extends transact { function __construct($owmuch,$whom) { $this->amount = $owmuch; $this->about = $whom; } } class spend extends transact { function __construct($amount,$whom) { $this->amount = -$amount; $this->about = $whom; } } /* ------------------------------------------ */ /* Main application (test program) reading in a tab separated set of accounts */ $wellhousemanor = array(); foreach (file("sage.xls") as $line) { list($val,$type,$desc) = explode("\t",trim($line)); /* We have to know what each object is as we create it */ switch ($type) { case "income": array_push($wellhousemanor,new income($val,$desc)); break; case "excome": array_push($wellhousemanor,new spend($val,$desc)); break; default: /* World's worst error handler */ print "Your data is busted\n"; } } /* Polymorphic use of objects we have created */ $runbal = 0; foreach ($wellhousemanor as $line) { $runbal += ($vp = $line->getvalue()); print ("Value $vp, balance $runbal, after ".$line->getabout()."\n"); } /* Example of how we call the comparators */ $better = $wellhousemanor[0]->morevaluable($wellhousemanor[3]); print ("The better one is ". $better->getabout() ."\n"); $best = transact::mostvaluable($wellhousemanor); print ("The best one is ". $best->getabout() ."\n"); /* How to sort an array of objects based on a class method */ usort($wellhousemanor,array("transact","mvf")); /* Output sorted results to test / prove correct operation */ foreach ($wellhousemanor as $line) { $runbal += ($vp = $line->getvalue()); print ("Value $vp, balance $runbal, after ".$line->getabout()."\n"); } /* Sample data file ------------------- 175.00 income John Smith 190.66 income Ahmed Patel 12.10 income Frugal McScot 12.34 dunno Fred Brown 100.00 excome Event Manager 150.00 excome UTAHs */ /* Sample output ---------------- Dorothy:oct08 grahamellis$ php compo.php Your data is busted Value 175.00, balance 175, after John Smith Value 190.66, balance 365.66, after Ahmed Patel Value 12.10, balance 377.76, after Frugal McScot Value -100, balance 277.76, after Event Manager Value -150, balance 127.76, after UTAHs The better one is John Smith The best one is Ahmed Patel Value -150, balance -22.24, after UTAHs Value -100, balance -122.24, after Event Manager Value 12.10, balance -110.14, after Frugal McScot Value 175.00, balance 64.86, after John Smith Value 190.66, balance 255.52, after Ahmed Patel Dorothy:oct08 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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other closely related examples on the "Objects in PHP" module index page.
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