<?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;

?>