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Two classes, inheritance, factory, JSON, error handler, etc
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):
   • Catchable fatal error in PHP ... How to catch, and alternative solutions such as JSON - [link]

Source code: oop5.php Module: H108
<?php

class stop {

        function busier($that) {
                $first = $this->gettickets(2010);
                $second = $that->gettickets(2010);
                if ($first > $second) return $this;
                return $that;
                }

        function __construct($record) {
                $this->info = trim($record);
                $this->cached = 0;
                }
        protected function checkcache() {
                if ($this->cached == 0) {
                        $this->cached = 1;
                        $this->fields = explode("\t",$this->info);
                        }
                }

        static function busiest($group) {
                $sofar = $group[0];
                foreach ($group as $maybe) {
                        $sofar = $sofar->busier($maybe);
                }
                return $sofar;
        }

        static function factory($stringy) {
                $fol = explode("\t",$stringy);
                if (count($fol) < 6)
                        return new ferryport($stringy);
                return new station ($stringy);
                }

}

class station extends stop {
        function getname() {
                $this->checkcache();
                return $this->fields[6];
                }
        function gettickets($year) {
                $this->checkcache();
                return ($this->fields[$year-1998]);
                }
}

class ferryport extends stop {
        function getname() {
                $this->checkcache();
                return $this->fields[2];
                }
        function gettickets($year) {
                $this->checkcache();
                return ($this->fields[3]);
                }

}

function cat_chit($errno, $errstr, $errfile, $errline) {
  if ( E_RECOVERABLE_ERROR===$errno ) {
    print ("\n\ncaught a normlly fatal error\n");
    print ("Error number: $errno\n");
    print ("Error string: $errstr\n");
    print ("Error file: $errfile\n");
    print ("Error line: $errline\n");
    return true;
  }
  return false;
}

/* Sample Data record
8976 ABD AB11 6LX NJ 941058 57.1430482477 -2.0974804963
Aberdeen 1931973 2107855 2278872 2470281 2568810 2657014 */


$fh = fopen("railstats.txt","r");

$destinations = array();
while (($lyne = fgets($fh)) != "" ) {
        array_push($destinations,new station($lyne));
        }

array_push($destinations, new ferryport("0000\tZEX\tExmouth_Slipway\t14107"));
$destinations[500] = new ferryport("0001\tXDO\tDover_Dox\t1234568");

array_push($destinations, stop::factory("0001\tXCA\tCalais\t995423"));

foreach ($destinations as $current) {
        $nos1 = $current->getname();
        $older = $current->gettickets(2005);
        $newer = $current->gettickets(2010);
        print ("Set up $nos1 - from $older to $newer\n");
        }

$result = $destinations[50]->busier($destinations[500]);
print ($result->getname() . "\n");

$result = stop::busiest(array_slice($destinations,100,200));
print ($result->getname() . "\n");

set_error_handler('cat_chit');

# Following line would fail - can't convert object to string in PHP
print ($result . "\n");

print (json_encode($result) . "\n");

$saveit = <<<SAMPLE

Here is some sample output:

Set up Aylesbury Vale Parkway - from NULL to 49212
Set up Abercynon North - from 112811 to NULL
Set up Garston (Merseyside) - from 190778 to NULL
Set up Exmouth_Slipway - from 14107 to 14107
Set up Calais - from 995423 to 995423
Dover_Dox
Brighton

caught a normlly fatal error
Error number: 4096
Error string: Object of class station could not be converted to string
Error file: /Users/grahamellis/oop/oop5.php
Error line: 108

{"info":"5268\tBTN\tBN1 3XP\tTQ 309050\t50.8289532182\t-0.141225193\tBrighton
\t11295080\t11854512\t12853442\t13474555\t13806628\t13741582","cached":1,
"fields":["5268","BTN","BN1 3XP","TQ 309050","50.8289532182","-0.141225193",
"Brighton","11295080","11854512","12853442","13474555","13806628","13741582"]}

SAMPLE;

?>

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
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

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