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Question

I am writing a php where one of its function is to scrape data from internet. Thanks to Barmar, now I can display my scrapping result smoothly in my index.php file. Now, I want to update my scraping result to my database. But before that, I need to access to my scrapping result inside the tag of id “result”. Here is my php:

<!DOCTYPE html>
<html>     
<head>
<meta charset="utf-8" />
<title>contacts.php</title>
</head>
<body>

    <div id="result">
    </div>

<?php
    $tz = 'Asia/Hong_Kong';
    $timestamp = time();
    $dt = new DateTime("now", new DateTimeZone($tz)); //first argument "must" be a string
    $dt->setTimestamp($timestamp); //adjust the object to correct timestamp

    $eng_gov_html = 'https://www.info.gov.hk/gia/wr/' . substr($dt->format('Y/m/d'),0, 4) . substr($dt->format('Y/m/d'),5, 2) . '/'. substr($dt->format('Y/m/d'),8, 2) . '.htm';

    $rootFolder = dirname(__DIR__);
    require_once $rootFolder.'/Bulletin Translator/private/lib/vendor/autoload.php';

    $client = new GuzzleHttpClient();
    $response = $client->request('GET', 'https://api.github.com/repos/guzzle/guzzle');

    // Send an asynchronous request.
    $request = new GuzzleHttpPsr7Request('GET', $chin_gov_html);
    $promise = $client->sendAsync($request)->then(function ($response) 
    {
        $doc = new DOMDocument();

        $body = (string) $response->getBody();
        libxml_use_internal_errors(true);
        $doc->loadHTML($body);
        $xpath = new DOMXPath($doc);
    

        $bulltin_name = $xpath->evaluate('//body/div/div/div/ul/li/a');
        echo '<script>document.getElementById("result").innerHTML = "";</script>';

        foreach($bulltin_name as $element)
        {
            //print_r($element->textContent."<br>");
            echo '<script>

                    for (i = 0; i <'. json_encode($element->textContent, JSON_UNESCAPED_UNICODE) .'.length; i++)
                    {
                        if ('. json_encode($element->textContent, JSON_UNESCAPED_UNICODE) .'.substring(i, i+1)!=" ")
                        {
                            document.getElementById("result").innerHTML+='. json_encode($element->textContent, JSON_UNESCAPED_UNICODE) .'.substring(i, i+1);
                        }
                    }
                    document.getElementById("result").innerHTML+="</br>";

                </script>';
        }

    
        echo '<script>
                    var total_bulletin_number = document.getElementById("result").innerHTML.split("天氣稿第").length - 1;
              </script>';

       $bulltin_url = $xpath->evaluate('//body/div/div/div/ul/li/a/@href');
       foreach($bulltin_url as $url)
       {
            echo '<script> document.getElementById("result").innerHTML+='. json_encode($url->textContent,JSON_UNESCAPED_UNICODE) .'+ "</br>"</script>';
        }

        echo '<script>
                  var content_array = document.getElementById("result").innerHTML.split("<br>");
                  document.getElementById("result").innerHTML = "";
              
                  for (c = total_bulletin_number - 1; c >= 0 ; c--)
                  {
                      document.getElementById("result").innerHTML += content_array[c].substring(4, 7) + ": " + content_array[c].substring(9) + ", " + "https://www.info.gov.hk" + content_array[total_bulletin_number + c] + "</br>";
                  }
              
                  document.getElementById("result").removeChild(document.getElementById("result").lastElementChild);
                  content_array = document.getElementById("result").innerHTML.split("<br>");
              </script>';
    
        $result = $doc->getElementById('result')->textContent;
        print_r(explode("htm", $result));
    });

    $promise->wait();
?>

<?php

    // Some script here to upload the result to database...
    // Some script here to upload the result to database...
    // Some script here to upload the result to database...

?>
</body>
</html>

Now, I want to perform an operation in php like this as if in javascript:

var content_array = document.getElementById("result").innerHTML.split(".htm");
var content_arrary_length = content_array.length;

I try to add two lines at the end of my php script:

$result = $doc->getElementById('result')->textContent;
print_r(explode("htm", $result));
print_r(count(explode("htm", $result));

However, an error is returned:

Warning: Attempt to read property "textContent" on null in C:xampphtdocsBulletin Translatorindex.php on line 118

What shall I do to asign a varibale to the result div within the same php file?

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Danh mục

How to access a html element in a PHP async function