Count "getElementById" in PHP

Question

Need to showup the Qty of "IDs" or "Class" from a Site in my header.

It a job-site, i want to count the IDs or class of my Job Listings and show the number in my header (Menu).

How is it possible? With "getElementsByTagName" it works like a charme. Tried with "H3" Tags, but i have to many h3 on the site, so the qty / number is not correct.

my code now:

<?php
$htmlString = file_get_contents('https://www.mywebsite.de/unternehmen/jobs/');

//Create a new DOMDocument object.
$htmlDom = new DOMDocument;

//Load the HTML string into our DOMDocument object.
@$htmlDom->loadHTML($htmlString);


//Extract all h3 elements / tags from the HTML.
$h3Tags = $htmlDom->getElementsByTagName('h3');

$jobanzahl = $htmlDom->getElementById('jobtitel')->nodeValue;

echo "Total H3 Tags: ". count($h3Tags)."<br/>";

Answer 1

It would be much easier to use the SELECT COUNT with your database, because you can manage which job offers are active and which are not. You can also ORDER BY starting date if you wish !

Here is the dataset I used for this example :

Each job has a unique id (int) as a primary key, a title (varchar), a description (text), a starting date (date) and a status (active or not - boolean). You can archive inactive offers for monthly or yearly reports, but you must count only active ones.

At first, I display the offers on a very basic html page :

$sql = "SELECT * FROM job";

$stmt = $conn->prepare($sql);  

$stmt->execute();

$result = $stmt->get_result();

echo "<h1>JOBS</h1>";
echo "<br>";

if ($result->num_rows > 0) {
    
  // output data of each row
  while($row = $result->fetch_assoc()) {
      
      echo "<h2>" . $row['title'] .  "</h2>";
      echo "<p>" . $row['description'] .  "</p>";
      echo "<p><small>Starting on : " . $row['start_date'] .  "</small></p>";
      echo "<hr>";
    
  }
    
}

And then, I count and display the number of active offers :

$sql = "SELECT COUNT(*) AS c FROM job WHERE isActive = 1";

$stmt = $conn->prepare($sql);

$stmt->execute();

$result = $stmt->get_result();
    
// output data of each row
while($row = $result->fetch_assoc()) {
      
    echo "<p>There are " . $row['c'] . " offers</p>";
    
}

Here is the final result :

Finally, you should look at this codepen to circle the result :

https://codepen.io/jnbruno/pen/vNpPpW