How to count number of pages a URL contains via an ID?

Question

I am building a script thats goal is to check up to 100 URLS for validity (No 404).

The only variable in the URL is the page number, like so:

http://example.com/category/id/products/page/1
http://example.com/category/id/products/page/2

and so on up to 100,

as soon as my code reaches an invalid URL, I want it to stop and echo the number it has reached, this is the code I am trying to no avail:

$url ="http://example.com/category/id/products/page/1";

if (false !== strpos($url, $id)) {

    $pageNumber = 2;
    $check = true;

do{

    $urlIterate = "http://example.com/category/id/products/page/".$pageNumber;

    if(false !== strpos($urlIterate, $id)){

        $pageNumber++;

    }

    else{

        $check = false;

    }

}

while($pageNumber <= 99);

}

else{

    $check = false;
    echo 'No pages were found at all';

}

echo "There were ". $pageNumber." pages.;

?>

Answer 1

Im not sure if this is what youre looking for, but try this:

<?php

    $id_to_search = "90";

    for ($i = 1; $i <= 100; $i++) {
        $url = "http://example.com/category/id/products/page/" . $i;
        $values = parse_url($url);
        $paths = explode('/', $values['path']);
        $id_from_url = $paths[5];
        if ($id_to_search === $id_from_url) {
            $headers = get_headers($url);
            if ($headers[0] == 'HTTP/1.0 404 Not Found') {
                echo "URL Found! URL is invalid(404). URLs searched = " . $i . "<br>";
            } else {
                echo "URL is valid<br>";
            }
        } else {
            echo "URL was searched but it does not match the ID we are looking for<br>";
        }
    }