find a element in html and explode it for stock - php

Question

I want to retrieve an HTML element in a page.
<h2 id="resultCount" class="resultCount">
<span>
Showing 1 - 12 of 40,923 Results
</span>
</h2>
I have to get the total number of results for the test in my php.
For now, I get all that is between the h2 tags and I explode the first time with space.
Then I explode again with the comma to concatenate able to convert numbers results in European format. Once everything's done, I test my number results.
define("MAX_RESULT_ALL_PAGES", 1200);
$queryUrl = AMAZON_TOTAL_BOOKS_COUNT.$searchMonthUrlParam.$searchYearUrlParam.$searchTypeUrlParam.urlencode($keyword)."&page=".$pageNum;
$htmlResultCountPage = file_get_html($queryUrl);
$htmlResultCount = $htmlResultCountPage->find("h2[id=resultCount]");
$resultCountArray = explode(" ", $htmlResultCount[0]);
$explodeCount = explode(',', $resultCountArray[5]);
$europeFormatCount = '';
foreach ($explodeCount as $val) {
$europeFormatCount .= $val;
}
if ($europeFormatCount > MAX_RESULT_ALL_PAGES) {*/
$queryUrl = AMAZON_SEARCH_URL.$searchMonthUrlParam.$searchYearUrlParam.$searchTypeUrlParam.urlencode($keyword)."&page=".$pageNum;
}
At the moment the total number of results is not well recovered and the condition does not happen even when it should.
Someone would have a solution to this problem or any other way?

Answer 1

I would simply fetch the page as a string (not html) and use a regular expression to get the total number of results. The code would look something like this:
define('MAX_RESULT_ALL_PAGES', 1200);
$queryUrl = AMAZON_TOTAL_BOOKS_COUNT . $searchMonthUrlParam . $searchYearUrlParam . $searchTypeUrlParam . urlencode($keyword) . '&page=' . $pageNum;
$queryResult = file_get_contents($queryUrl);
if (preg_match('/of\s+([0-9,]+)\s+Results/', $queryResult, $matches)) {
$totalResults = (int) str_replace(',', '', $matches[1]);
} else {
throw new \RuntimeException('Total number of results not found');
}
if ($totalResults > MAX_RESULT_ALL_PAGES) {
$queryUrl = AMAZON_SEARCH_URL . $searchMonthUrlParam . $searchYearUrlParam . $searchTypeUrlParam . urlencode($keyword) . '&page=' . $pageNum;
// ...
}

Answer 2

A regex would do it:
...
preg_match("/of ([0-9,]+) Results/", $htmlResultCount[0], $matches);
$europeFormatCount = intval(str_replace(",", "", $matches[1]));
...

Answer 3

Please try this code.
define("MAX_RESULT_ALL_PAGES", 1200);
// new dom object
$dom = new DOMDocument();
// HTML string
$queryUrl = AMAZON_TOTAL_BOOKS_COUNT.$searchMonthUrlParam.$searchYearUrlParam.$searchTypeUrlParam.urlencode($keyword)."&page=".$pageNum;
$html_string = file_get_contents($queryUrl);
//load the html
$html = $dom->loadHTML($html_string);
//discard white space
$dom->preserveWhiteSpace = TRUE;
//Get all h2 tags
$nodes = $dom->getElementsByTagName('h2');
// Store total result count
$totalCount = 0;
// loop over the all h2 tags and print result
foreach ($nodes as $node) {
if ($node->hasAttributes()) {
foreach ($node->attributes as $attribute) {
if ($attribute->name === 'class' && $attribute->value == 'resultCount') {
$inner_html = str_replace(',', '', trim($node->nodeValue));
$inner_html_array = explode(' ', $inner_html);
// Print result to the terminal
$totalCount += $inner_html_array[5];
}
}
}
}
// If result count grater than 1200, do this
if ($totalCount > MAX_RESULT_ALL_PAGES) {
$queryUrl = AMAZON_SEARCH_URL.$searchMonthUrlParam.$searchYearUrlParam.$searchTypeUrlParam.urlencode($keyword)."&page=".$pageNum;
}

Answer 4

Give this a try:
$match =array();
preg_match('/(?<=of\s)(?:\d{1,3}+(?:,\d{3})*)(?=\sResults)/', $htmlResultCount, $match);
$europeFormatCount = str_replace(',','',$match[0]);
The RegEx reads the number between "of " and " Results", it matches numbers with ',' seperator.