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Associative Objects
Objects in PHP example from a Well House Consultants training course
More on Objects in PHP [link]

This example is described in the following article(s):
   • Associative objects - one object within another. - [link]

Source code: po8 Module: H108
<?php

# Associative Objects - one object in another

class time {
        function __construct($base) {
                preg_match('/(\d+).+?(\d+)/',$base,&$gotted);
                $this->hour = $gotted[1];
                $this->min = $gotted[2];
                $this->mam = $this->hour * 60 + $this->min;
        }
        function getforward($by) {
                if ($by > 0) {
                        $rv = time::format($this->mam + $by);
                } else {
                        $rv = "untimed";
                }
                return $rv;
        }
        function getclock() {
                $rv = time::format($this->mam);
                return $rv;
        }
        static function format($ends) {
                $rv = sprintf("%02d:%02d",$ends/60,$ends%60);
                return $rv;
        }
}

class transport {
        function __construct($s,$where,$when,$dur=-1) {
                $this->len = 1;
                $this->where = $where;
                $this->when = new time($when);
                $this->seats = $s;
                $this->dur = $dur;
        }
        function getdestiny() {
                return $this->where;
        }
        function gettime() {
                return $this->when->getclock();
        }
        function getcapacity() {
                return (floor($this->len * $this->seats));
        }
        function getarrival() {
                $when = $this->when;
                return $when->getforward($this->dur);
                }
        static function create($raw) {
                $raw = preg_replace('/#.*/','',$raw);
                $parts = explode("\t",trim($raw));
                $rv = false;
                if ($parts[0] == "Train") {
                        $rv = new train(floor($parts[2]),floor($parts[3]),$parts[4],$parts[5],floor($parts[6]));
                }
                if ($parts[0] == "Bus") {
                        $rv = new bus(floor($parts[2]),$parts[3],$parts[4],floor($parts[5]));
                }
                if ($parts[0] == "Plane") {
                        $rv = new plane(floor($parts[2]),$parts[3],$parts[4],floor($parts[5]));
                }
                if (! $rv) {
                        if (preg_match('/\S/',$raw)) {
                                # print ("Fault in $raw\n");
                                throw new Exception('Corrupt line');
                        }
                }
                return $rv;
        }
        static function factory($source) {
                $options = array();
                $n=0;
                foreach (file($source) as $record) {
                        $n++;
                        try {
                                $option = transport::create($record);
                                if ($option) array_push($options,$option);
                        }
                        catch (Exception $e) {
                                print ("OOps in line $n: $record");
                        }

                }
                return $options;
        }

        static function getFlow($services) {
                $so_far = 0;
                foreach ($services as $service) {
                        $so_far += $service->getCapacity();
                }
                return $so_far;
        }
}

class train extends transport {
        function __construct($len,$s,$where,$when,$dur=-1) {
                $this->len = $len;
                $this->where = $where;
                $this->when = new time($when);
                $this->seats = $s;
                $this->dur = $dur;
        }
        function getcapacity() {
                return (floor($this->len * $this->seats * 1.4));
        }
        function getlength() {
                return ($this->len * 23.0);
        }
        function addCarriages($owmany) {
                return ($this->len += $owmany);
        }
}

class bus extends transport {
        function getcapacity() {
                return (floor($this->seats + 6));
        }
        function getlength() {
                return ($this->len * 15.0);
        }
}
class plane extends transport {
        function getlength() {
                return (79);
        }

}

# -------- Above here - code to right of line

$travel = transport::factory("podata.txt");

foreach ($travel as $go) {
        $C = $go->getcapacity();
        $L = $go->getlength();
        $D = $go->getdestiny();
        $W = $go->gettime();
        $A = $go->getarrival();
        print ("To $D at $W (to $A) for $C length $L\n");
        }

$escape = transport::getFlow($travel);
print ("Total capacity is $escape\n");

/* Sample data

Train 180 5 70 Swansea 09-30 58
Train 125 8 65 Cardiff 10:00 93
Train 125 8 65 Swansea 10spock30 55
Bus RMT 84 Old Town 09:40 26
Bus RMT 84 Dorcan 10:10 34
Plane 777 300 Gdansk 10:26 120

Sample run

munchkin:dpat grahamellis$ php po8
OOps in line 4: gg
To Swansea at 09:30 (to 10:28) for 489 length 115
To Cardiff at 10:00 (to 11:33) for 728 length 184
To Swansea at 10:30 (to 11:25) for 728 length 184
To Old Town at 09:40 (to 10:06) for 90 length 15
To Dorcan at 10:10 (to 10:44) for 90 length 15
To Gdansk at 10:26 (to 12:26) for 300 length 79
Total capacity is 2425

*/



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
Yes. We have over 700 books in our library. Books covering PHP are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Objects in PHP" training module. You'll find a description of the topic and some other closely related examples on the "Objects in PHP" module index page.

Full description of the source code
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