How can dead links be avoided in PHP websites?

Dead links in PHP websites can be avoided by regularly checking for broken links and updating them accordingly. One way to automate this process is by creating a PHP script that crawls through the website, checks each link for validity, and notifies the website administrator of any broken links. 

<?php
// Function to check if a link is valid
function isLinkValid($url) {
  $headers = @get_headers($url);
  return strpos($headers[0], '200') ? true : false;
}

// Function to crawl through the website and check links
function checkLinks($url) {
  $doc = new DOMDocument();
  @$doc->loadHTML(file_get_contents($url));

  $links = $doc->getElementsByTagName('a');
  foreach ($links as $link) {
    $href = $link->getAttribute('href');
    if (!isLinkValid($href)) {
      echo "Broken link found: " . $href . "\n";
    }
  }
}

// Call the function with the website URL
checkLinks("http://example.com");
?>

Keywords

404 error link checking PHP functions error handling URL validation

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