How can the code be optimized to only apply the link checker to external domain links in PHP?

To optimize the code to only apply the link checker to external domain links in PHP, you can check the domain of each link and only run the link checker on links that do not belong to the same domain as the current page. This can be achieved by comparing the domain of the current page with the domain of each link. 

// Get the current domain
$current_domain = $_SERVER['HTTP_HOST'];

// Loop through all links and check if they are external
foreach ($links as $link) {
    $link_domain = parse_url($link, PHP_URL_HOST);
    
    // Check if the link is external
    if ($link_domain != $current_domain) {
        // Run link checker code here
    }
}

Keywords

PHP optimization link checker external domain links regular expressions

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