In what situations should a PHP developer reach out to the owners of a website before scraping their content?

A PHP developer should reach out to the owners of a website before scraping their content if the website explicitly prohibits scraping in their terms of service or if the scraping could potentially overload the website's servers. It's important to respect the wishes of website owners and avoid causing any harm or disruption to their site.

// Check if scraping is allowed by the website's terms of service
// If not allowed, reach out to the website owners before proceeding with scraping
if($website->terms_of_service->allow_scraping == false){
    // Reach out to the website owners before scraping
    $contact_email = "owner@example.com";
    $message = "Hello, I am a PHP developer interested in scraping your website. Can you please provide permission to do so?";
    
    // Send email to website owners
    mail($contact_email, "Request for scraping permission", $message);
}