PHP Factory Pattern Step By Step Tutorial - Part 3: This post show us how to avoid copy and paste job by implement factory pattern. You don't need rewrite same code for same job. It will look your code more clear.
<?
class Bidding{
var $lowest = 0;
var $highest = 0;
var $yourbid = 0;
function Bidding($yourbid){
$yourbid = (int)$yourbid;
if($yourbid <= 0){
trigger_error("price must be greater than 0");
}
$this->yourbid = $yourbid;
}
function bidRange($lowest = 0, $highest = 0){
$lowest = (int)$lowest;
if($lowest <= 0){
trigger_error("price must be greater than 0");
}
$this->lowest = $lowest;
$highest = (int)$highest;
if($highest <= 0){
trigger_error("price must be greater than 0");
}
$this->highest = $highest;
}
function checkBid(){
if($this->yourbid < $this->lowest
|| $this->yourbid > $this->highest){
return "You are not in range!";
}else{
return "Your bid is accepted!";
}
}
}
$bid = new Bidding(100);
$bid->bidRange(100,1000);
echo $bid->checkBid();
?>
Following picture will show us how to improve above code with factory pattern:
<?
class Bidding{
var $lowest = 0;
var $highest = 0;
var $yourbid = 0;
function Bidding($yourbid){
$this->yourbid = $this->checkPrice($yourbid);
}
function checkPrice($price){
$price = (int)$price;
if($price <= 0){
trigger_error("price must be greater than 0");
}else{
return $price;
}
}
function bidRange($lowest = 0, $highest = 0){
$this->lowest = $this->checkPrice($lowest);
$this->highest = $this->checkPrice($highest);
}
function checkBid(){
if($this->yourbid < $this->lowest
|| $this->yourbid > $this->highest){
return "You are not in range!";
}else{
return "Your bid is accepted!";
}
}
}
$bid = new Bidding(100);
$bid->bidRange(100,1000);
echo $bid->checkBid();
?>
