php Prestashop- where can I find the following functions - php

Question

In a Prestashop Ecommerce website I have a module that was created specially to compare and set products price in my website,
I need some help understand some of his PHP code.
The followng code set the price of a product in my website after scanning and finding the minumum price in other website link providede at the product backend page:
My Question is: How does this code works? where is the part of the code that scan the other website and get the minumum price in it?
<?php
class ProductCMP extends Module
{
public function __construct()
{
$this->name = 'productcmp';
$this->tab = 'front_office_features';
$this->version = '1.0.0';
$this->author = 'biznesownia';
parent::__construct();
$this->displayName = $this->l('ProductCMP', FALSE, NULL);
}
public function install()
{
return parent::install()
and $this->registerHook('displayAdminProductsExtra')
and $this->registerHook('actionAdminProductsControllerSaveAfter');
}
public function hookDisplayAdminProductsExtra($params)
{
$product = new Product((int) Tools::getValue('id_product'), false);
$tpl = $this->context->smarty->createTemplate(dirname(__FILE__).'/templates/tab.tpl', $this->context->smarty);
$tpl->assign('product', $product);
return $tpl->fetch();
}
public function hookActionAdminProductsControllerSaveAfter($params)
{
# set data
$id_product = (int) Tools::getValue('id_product');
$product = new Product($id_product, false, (int) $this->context->language->id);
$product->compare_active = (bool) Tools::getValue('compare_active', false);
$product->compare_link = (string) Tools::getValue('compare_link', '');
$product->compare_price = (string) Tools::getValue('compare_price', 0);
return $product->save();
}
public function compare()
{
define('PRODUCT_COMPARE_EMAIL', 'uditools#gmail.com');
set_time_limit(60*60);
# get list
$products = Db::getInstance()->executeS("
SELECT p.`id_product`, pl.`name`
FROM `"._DB_PREFIX_."product` p
LEFT JOIN `"._DB_PREFIX_."product_lang` pl ON (p.`id_product` = pl.`id_product` ".Shop::addSqlRestrictionOnLang('pl').")
WHERE
pl.`id_lang` = ".(int)$this->context->language->id."
AND p.`compare_active`=1
ORDER BY p.`id_product`
");
# job
$report = array();
foreach($products as $p)
{
try
{
$result = $this->_compareProduct((int) $p['id_product']);
if($result && $result['changed'])
{
$result['id_product'] = $p['id_product'];
$result['name'] = $p['name'];
$report[] = $result;
}
}
catch(Exception $e)
{
$report[] = array(
'id_product' => $p['id_product'],
'name' => $p['name'],
'res' => false,
'msg' => 'Exception occured',
);
}
}
# if there is nothing to report
if(!$report)
return true;
# output
$output = '';
foreach($report as $row)
{
$link = $this->context->link->getProductLink($row['id_product']);
$output .= $row['id_product'] .' - '. $row['name'] .' '. ($row['res'] ? 'Ok!' : 'Error!') .' : '. $row['msg'] ."\r\n";
}
# send mail
$tpl_vars = array(
'{report_txt}' => strip_tags($output),
'{report_html}' => nl2br($output),
);
Mail::Send(
$this->context->language->id,
'report',
'Price update report',
$tpl_vars,
PRODUCT_COMPARE_EMAIL,
'',
Configuration::get('PS_SHOP_EMAIL'),
Configuration::get('PS_SHOP_NAME'),
null,
null,
dirname(__FILE__).'/mails/',
null,
$this->context->shop->id
);
return true;
}
public function compareTest($id_product)
{
$report = $this->_compareProduct($id_product);
var_dump($report);
die;
}
protected function _compareProduct($id_product)
{
# load product
$product = new Product($id_product, false, $this->context->language->id, $this->context->shop->id);
if(!Validate::isLoadedObject($product))
return false;
if(!$product->compare_link)
return false;
$oldPrice = (float) $product->price;
//******
# request
$data = file_get_contents($product->compare_link);
# analize price
if(!preg_match('!data-free-data=\'([^\']+)\'!i', $data, $matches))
{
return array(
'res' => false,
'msg' => 'Price not found!',
);
}
//******
$prices = json_decode($matches[1], true);
$newPrice = (float) $prices['minPrice'];
if(!$newPrice)
{
return array(
'res' => false,
'msg' => 'Zero price!',
);
}
# check change
$changed = $oldPrice != $newPrice;
if(!$changed)
{
return array(
'res' => false,
'msg' => 'The price is the same.',
);
}
$newPrice += (float) $product->compare_price;
# check change
$changed = $oldPrice != $newPrice;
if(!$changed)
{
return array(
'res' => false,
'msg' => 'The price is the same.',
);
}
# update
$product->price = $newPrice;
if(!$product->save())
{
return array(
'res' => false,
'msg' => 'Not saved!',
);
}
return array(
'res' => true,
'changed' => $changed,
'msg' => 'Updated! From: '.round($oldPrice, 2).' To: '.round($newPrice, 2),
);
}
}

Answer 1

There are needed function
protected function _compareProduct($id_product)
{
# load product
$product = new Product($id_product, false, $this->context->language->id, $this->context->shop->id);
if(!Validate::isLoadedObject($product))
return false;
if(!$product->compare_link)
return false;
$oldPrice = (float) $product->price;
//******
# request
$data = file_get_contents($product->compare_link);
# analize price
if(!preg_match('!data-free-data=\'([^\']+)\'!i', $data, $matches))
{
return array(
'res' => false,
'msg' => 'Price not found!',
);
}
//******
$prices = json_decode($matches[1], true);
$newPrice = (float) $prices['minPrice'];
if(!$newPrice)
{
return array(
'res' => false,
'msg' => 'Zero price!',
);
}
# check change
$changed = $oldPrice != $newPrice;
if(!$changed)
{
return array(
'res' => false,
'msg' => 'The price is the same.',
);
}
$newPrice += (float) $product->compare_price;
# check change
$changed = $oldPrice != $newPrice;
if(!$changed)
{
return array(
'res' => false,
'msg' => 'The price is the same.',
);
}
# update
$product->price = $newPrice;
if(!$product->save())
{
return array(
'res' => false,
'msg' => 'Not saved!',
);
}
return array(
'res' => true,
'changed' => $changed,
'msg' => 'Updated! From: '.round($oldPrice, 2).' To: '.round($newPrice, 2),
);
}