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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]
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
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